| Ductile to Brittle Transition Behaviour of HSLA-65 Steel Welds: Dynamic Tear Testing |
Jan 2011 |
62 pages |
| Authors:
Neil M Aucoin; DEFENCE RESEARCH AND DEVELOPMENT ATLANTIC DARTMOUTH (CANADA)
|
 | HSLA-65 steel (ASTM A945, grade 65) is regarded as an excellent naval ship steel. The use of this steel in future naval platforms, which may be required to serve in Arctic conditions, requires a detailed knowledge of the steel's low temperature mechanical properties, particularly when the steel is welded. A previous study on the transition temperature, conducted by Bayley and Mantei, showed that the transition temperature was significantly higher than ... |
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| The Mechanics of Failure at Connections: Size Effects and Scaling |
16 MAR 2005 |
7 pages |
| Authors:
Alan Needleman; BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
|
| The integrity of engineering structures is often limited by the fracture resistance at connections. This is particularly the case when materials having large differences in mechanical properties are joined. Research directed at the direct calculation of fracture at interfaces and connections under dynamic loading conditions was carried out. The accomplishments under this grant include: 1. showing that the ductile-brittle transition temperature for welds as measured in the Charpy impact test ... |
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| Simulation of Ductile Failure in Metals Under Dynamic Loading Conditions Using Advanced Material Damage Modeling |
JUL 2004 |
218 pages |
| Authors:
Nicola Bonora; Pietro P. Milella; CASSINO UNIV (ITALY) DIPARTIMENTO DI MECCANICA STRUTTURE AMBIENTE E TERRITORIO
|
| This report results from a contract tasking University of Cassino as follows: The contractor shall investigate the issue of advanced failure prediction and design by means of innovative material failure modeling and computational techniques. The specific tasks include: - the use and implementation of advanced material modeling incorporating damage. strain rate and temperature effects. in an extensive number of numerical simulations; - verification of the model effective predictive capabilities in ... |
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| The Effects of Retained Austenite on the Tensile Properties and Toughness of Ultra-High Strength Martensitic Precipitation Hardened Stainless Steels |
14 DEC 1998 |
47 pages |
| Authors:
Warren M. Garrison; CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The purpose of this work was to assess the effects of the amount of retained austenite content on the ductile-to-brittle transition temperature of martensitic precipitation strengthened stainless steels for four different precipitation strengthening systems, one utilizing NiTi strengthening and three utilizing R-phase strengthening. The retained austenite contents in the four systems were varied by varying composition. The austenite content in the NiTi strengthened system was varied by varying the chromium ... |
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| High Strength Steel Welding Research |
AUG 1998 |
233 pages |
| Authors:
Glen R. Edwards; David L. Olson; Stephen Liu; COLORADO SCHOOL OF MINES GOLDEN CENTERFOR WELDING RESEARCH
|
| By optimizing the contents of microalloying elements and elements that promote dual precipitation, a family of welding consumables with excellent characteristics were developed. These electrodes were insensitive to moderate variations in chemical composition or cooling rate, had acceptable strength and impact toughness, and exhibited more uniform mechanical properties throughout the entire weldment cross-section, including the reheated weld zones. An electrode containing 1.25 wt. pct. ... |
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| Fracture Studies on High Hardness BISALLOY 500(R) Steel |
MAR 1998 |
|
| Authors:
M. Z. Khan; S. J. Alkemade; G. M. Weston; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)
|
 | Mechanical properties of a high hardness alloy steel containing microstructural banding were determined in both transverse (T-L) and longitudinal (L-T) orientations with respect to the rolling direction. Tests undertaken included tensile, Charpy impact, fracture toughness, stress corrosion and constant amplitude fatigue. The specimen orientation was found to have little influence on the tensile properties however, Charpy V-notch specimens tested in the L-T orientation showed impact energy values four times higher ... |
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| Ductile Fracture |
MAR 97 |
11 pages |
| Authors:
Alan Needleman; BROWN UNIV PROVIDENCE RI
|
| Modeling and computational tools were developed to carry out analyses of dynamic ductile fracture and brittle-ductile transitions without using any ad hoc crack growth criteria. Among the key results obtained were: (1) prediction of a non-monotonic size effect in dynamic ductile failure processes, (2) resolution of an apparent paradox where under certain loading conditions steels, and other materials, exhibit brittle failure at low loading rates and ductile failure at high ... |
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| Progress Report - Mechanical Properties Evaluation of ASTM A945 (HSLA- 65) Steels |
SEP 96 |
17 pages |
| Authors:
Eric M. Focht; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SURVIVABILITY STRUCTU RES AND MATERIALS DIRECTORATE
|
| This report documents the mechanical properties of steel plates for Navy use. These plates conform to American Society for Testing and Materials (ASTM) Standard A945, High-strength, Low-alloy (HSLA), Class 65. Plates of various thickness were purchased from two different producers to determine if the steel could be obtained on a production scale, as opposed to a custom order. Tensile and Charpy V-notch impact tests were performed on the steels, and ... |
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| Strength and Crack Resistance Behavior of Mismatched Welded Joints |
JUL 95 |
49 pages |
| Authors:
R. L. Tregoning; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV ANNAPOLIS MD METALS DEPT
|
| A mismatched welded component exists when the strength of the weld material is different than the strength of the base material. This research has examined the effect of weld joint geometry and mismatch level on the strength and fracture performance of high strength steel weld components. Fracture performance was studied only for applied three-point bending loading. Eleven different welded systems were constructed with mismatch ranging between -36% to +47% and ... |
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| Fracture Resistance of Welded Aluminum AlMg4.5Mn for Application in Surface Ships |
12 APR 95 |
59 pages |
| Authors:
C. Koning; METAALINSTITUUT TNO APELDOORN (NETHERLANDS)
|
| The most important requirement for a constructional material from the viewpoint of safety is avoidance of brittle fracture. Especially for the combination of lower temperature and high strain rate during explosive blast loading, initiation and propagation of brittle fracture can occur in ship's material with plate thicknesses of 6/15 mm. These plates are being used for the fabrication of surface ships of the Royal Dutch Navy. In this report the ... |
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| Fracture Toughness Assessment of Present and Future Pressure Vessel Materials Based on Charpy Impact Energy and Yield Strength |
FEB 95 |
14 pages |
| Authors:
Edward Troiano; Gregory Vigilante; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| Several medium and high strength alloys, including AF1410, Inconel 718, PH 13-8 Mo stainless steel, and ASm( A723 high strength low alloy steel, have been heat treated to various strength and toughness levels and evaluated for correlations between fracture toughness and charpy impact energy. The correlations investigated included those by Roffe-Novak and Ault-Wald-Bertolo. previous work by Kapp and Underwood suggests that for A723 steel, the Rolfe- Novak correlation predicts the ... |
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| Fatigue Life and Fracture Analyses for the M185/M284 Breech Ring |
JAN 95 |
21 pages |
| Authors:
J. H. Underwood; E. Troiano; A. A. Kapusta; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| Fracture mechanics and fatigue life analyses were performed for Ml85/ M2S4 breech rings, with emphasis on ring Serial No. 1659, which failed during safe life testing after 109 pressure cycles. Mechanical and fracture properties from the breech rings were measured and used to perform yield-before-break fracture analysis. Scanning electron fractography was used to determine the size of defect present in ring Serial No. 1659 prior to laboratory testing and the ... |
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| Perimeter-Yardstick Technique for Fracture Surface Fractal Analysis |
AUG 94 |
15 pages |
| Authors:
Gay Kendall; P. J. Cote; L. V. Meisel; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| Local fractal dimensions alpha(Chi, Epsilon), which are closely related to crowding indices of individual islands and lakes formed by sectioning of fracture surfaces produced in Charpy impact testing of a high-strength and high-toughness steel (ASTM A723) alloy, have been determined by perimeter- yardstick analysis. In this type of analysis, the perimeter of an island or lake on a fracture surface section is measured at several different magnifications, and Richardson's equation ... |
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| Evaluation of Welding Consumables and Procedures for Submarine Construction |
FEB 94 |
|
| Authors:
B. F. Dixon; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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| This report provides a summary of three developments in the welding of BIS 812 EMA and HY 590 high strength steels for the new RAN Collins Class submarine. Firstly, the established benchmark properties for Charpy energy, dynamic tear energy and elongation in the tensile test have been reviewed in the light of data collection from US, Australian and Swedish sources. A new set of benchmarks is proposed which takes into ... |
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| Correlation of Flux Composition and Inclusion Characteristics With Submerged Arc Weld Metal Properties in HY-100 Steel |
SEP 93 |
107 pages |
| Authors:
Kent W. Kettell; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Submerged arc weldments of HY-100 steel prepared under standard conditions with five commercially available fluxes were analyzed to discern a basis for the variation in mechanical properties associated with different flux use. The variations in flux chemistry resulted in alloyed weldments with diverse weld metal mechanical properties as evident by Charpy impact, tensile, dynamic tear, and microhardness tests. The microstructures and macrostructures were examined using optical and electron microscopy in ... |
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| Mechanism-Dependent Fractal Character of Fracture Surfaces in High Strength and Toughness ASTM A723 Steels |
JUN 93 |
12 pages |
| Authors:
Peter McAnulty; L. V. Meisel; P. J. Cote; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| The fractal character of fracture surfaces of thick-walled pressure vessels produced in the final fast fracture that terminates low cycle fatigue tests is compared with that of fracture surfaces produced in Charpy impact tests in samples of the same high strength and toughness steel (ASTM A723) alloy. Slit island analysis yielded fractal dimensions near 1.25 for the Charpy specimens, which is typical of high strength steel alloys previously studied, however, ... |
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| Material Analysis of Austempered Ductile Iron |
JAN 93 |
17 pages |
| Authors:
Sandra O. Roy; Kathryn E. Noll; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| A materials analysis was performed on a sample of austempered ductile iron (ADI). This material was supplied in the heat-treated condition by a commercial producer. ADI is being examined as a potential alternate material to be used in the manufacture of muzzle brakes and other candidate weapon components. The analysis included mechanical property determination, chemical composition determination, metallographic examination, and scanning electron microscopy. The mechanical properties obtained were compared to ... |
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| Correlation between Fracture Toughness, Charpy V-Notch Impact Energy, and Yield Strength for ASTM A723 Steel |
MAR 92 |
14 pages |
| Authors:
J. A. Kapp; J. H. Underwood; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| A large quantity of data for ASTM A723 steel correlating yield strength, Charpy impact energy, and fracture toughness has been compared with the Rolfe-Novak-Barsom correlation. The general conclusion is that this correlation is conservative, because if we estimate fracture toughness from Charpy impact energy measurements, the estimated toughness is less than the measured value. The data may be somewhat questionable, however, because the fracture toughness and Charpy impact energy measurements ... |
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| Marine Structural Steel Toughness Data Bank. Volume 3 |
28 AUG 91 |
623 pages |
| Authors:
J. G. Kaufman; Martin Prager; NATIONAL MATERIALS PROPERTY DATA NETWORK COLUMBUS OH
|
| The scope of this program was the development of a data bank on the toughness of steels which may be considered for marine applications such as ship hulls and drilling structures. Eleven steels of importance are included. Data from a variety of types of toughness tests were included in the database, including Charpy impact, fracture toughness, nil ductility transition, and drop- weight tear tests. The emphasis of this project was ... |
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| Fracture Behavior of Ultra-Low-Carbon Steel Plate and Heat-Affected- Zone |
DEC 90 |
98 pages |
| Authors:
M. G. Vassilaros; DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP MATERIALS ENGINEERING DEPT
|
| This report describes research carried out to investigate the fracture of ultra-low-carbon bainitic steels. Eight materials have been evaluated using notched-bar bend tests, tensile strength tests and Charpy V- notch impact tests, which were performed over a range of temperatures from -1965 C to +1005 C. These tests measured the cleavage fracture strength and the ductility to brittleness transition temperature under impact loading. The materials evaluated had carbon levels of ... |
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| Performance of Underwater Weldments |
05 SEP 90 |
254 pages |
| Authors:
R. J. Dexter; E. B. Norris; W. R. Schick; P. D. Watson; SOUTHWEST RESEARCH INST SAN ANTONIO TX
|
| Data reported herein indicate that the wet and wet-backed metal arc welding (SMAW) process can produce welds suitable for structural applications provided certain limitations of the welds are considered in design. Welding procedure qualification tests and fracture toughness (J sub Ic) tests were performed on wet, wet-backed, and dry fillet and groove welds made with (1) A-36 steel and E6013 electrodes, and (2) A-516 steel and nickel alloy electrodes. Despite ... |
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| Dynamic Fracture of Concrete. Part 1 |
14 FEB 90 |
295 pages |
| Authors:
Jiaji. Du; Neil M. Hawkins; A. S. Kobayashi; UNIV OF WASHINGTON SEATTLE DEPT OF CIVIL ENGINEERING
|
| Static and dynamic analyses of concrete failure based on fracture mechanics were conducted using crack-line wedge-loaded, double cantilever beam (CLWL-DCB) and edge-cracked, three point bend specimens under Mode I loading conditions, aimed at developing a mathematical model which describes the tensile failure process of concrete materials at the macro-level. The fracture process zone associated with a stably growing crack in concrete was determined by a hybrid experimental-numerical technique where a ... |
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| Mechanical Property Characterization of VascoMax T-300 |
AUG 89 |
16 pages |
| Authors:
Charles F. Hickey Jr.; David W. Dix; David Kagan; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| This report addresses a mechanical property characterization of 18% Nickel 300 grade cobalt-free maraging steel (T-300). Hardness, tensile, Charpy V-notch impact energy, and fracture toughness data were obtained for a 2-3/8- inch-diameter forged bar. These data are presented along with existing data on stress corrosion, microstructure, and ballistic performance for this and other maraging steels. The results indicated that the mechanical properties are more dependent on the aging temperature than ... |
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| Effect of Microstructure on Ballistic Performance of ESR (Electroslag Remelted) 4340 Steel |
AUG 89 |
22 pages |
| Authors:
Edward T. Myskowski; Albert A. Anctil; BATTELLE COLUMBUS DIV OH
|
| The objective of this investigation was to develop heat treating procedures which will consistently produce microstructures essentially free from large spheroidal carbides and, thus, provide reproducible and predictable ballistic behavior. Increasing normalizing temperature of ESR 4340 from 1600F to 2000F has little effect in reducing the size or number of carbide spheroids which are 1 micrometer in diameter or larger. In the range of 1500f to 2000F, increasing austenitizing temperature ... |
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| Heat Treatment Investigation of 4330 Vanadium-Modified Steel |
AUG 89 |
17 pages |
| Authors:
Charles F. Hickey Jr.; David W. Dix; Mary E. O'Donovan; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| The shear pin material for the T5106 155-mm torsional impact round was originally specified to have been 4340 steel. It was determined by the authors that the required properties of an ultimate shear strength of 150 ksi and Charpy impact value of 20 ft-lb at 40 F were not obtainable in 4340. The decision to employ 4330 vanadium-modified steel as a substitute shear pin material initiated this heat treatment and ... |
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| Fracture and Three Dimensional Stress Analyses of 7075 Aluminum Projectile Components Under Spin and Inertia Load |
JUN 89 |
27 pages |
| Authors:
J. H. Underwood; M. A. Scavullo; G. P. O'Hara; B. A. Konrad; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| A fracture case study of a high strength aluminum projectile component subjected to inertial and spin loading during launch from a cannon is presented. A three-dimensional finite element model was used to calculate the projectile stresses and to determine which of the several types of loading was the primary cause of failure. A design change to minimize spin loading resulted in a significantly reduced failure incidence. Mechanical and fracture mechanics ... |
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| The Effect of Notch Root Radius on the Determination of Toughness in Ultrahigh Strength Steel Friction Welds |
JUN 88 |
|
| Authors:
William S. Ricci; Eric B. Kula; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
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| The plain strain fracture toughness and Charpy impact energy of friction welds in ultrahigh strength AISI 4340 steel were determined. Fracture toughness values for the weld zone were found to exceed those of the base metal. This is believed to be due to the larger prior austenite grain size in the weld zone resultant from the weld thermal cycle. Charpy impact energy data for the weld zone, however, were approximately ... |
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| Effects of Sulfur Content on the Plain Strain Fracture Toughness of Inertia Welds in 4340 Steel |
SEP 87 |
|
| Authors:
William S. Ricci; Eric B. Kula; James D. Colgate; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| The plain strain fracture toughness of post-weld, reheat treated inertia welds in two heats of AISI 4340 steel of equivalent tensile properties, but different sulfur concentrations, was determined. The adverse reorientation of elongated sulfide inclusions in both heats, resultant from the forging stage of the welding cycle, caused reductions in ductility and toughness that were not remedied by reheat treatments. The percent elongation of inertia welded joints was found to ... |
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| Evaluation of Commercially Available Wet Welding Electrodes for Potential Repair of U.S. Navy Ships |
AUG 1987 |
29 pages |
| Authors:
Thomas C. West; Gene Mitchell; NAVAL SEA SYSTEMS COMMAND WASHINGTON DC
|
| As part of a program to determine the viability of underwater wet welding for repair of U. S. Navy surface ships, eight commercially available shielded metal arc wet welding electrodes were evaluated by a series of screening tests. Two E7014 type electrodes provided superior results and were used for welding procedure qualification testing on ASTM A-36 steel with a carbon equivalent of 0.35. Qualification testing included visual, liquid penetrant and ... |
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| A Method for Dynamic Fracture Initiation Testing of Ceramics |
MAY 87 |
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| Authors:
J. Duffy; S. Suresh; K. Cho; E. R. Bopp; BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
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| An experimental method is described whereby the dynamic fracture initiation toughness of ceramics and ceramic composites can be measured in pure tension or pure torsion at stress intensity factor rates of 100,000 to 1,000,000 MPA sq rt m/s. In this procedure, circumferentially-notched cylindrical rods are subjected to uniaxial cyclic compression at room temperature to introduce a self-arresting, concentric Mode I fatigue pre-crack, following the technique presented by Suresh et al. ... |
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| Variations in the Bainite Hardenability of ASTM A723 Steel |
MAY 87 |
22 pages |
| Authors:
Paul J. Cote; Lawrence V. Meisel; William Sheldon; ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET WEAPONS LAB
|
| Austenite transformation characteristics were determined for ASTM a723 steels prepared by various suppliers and refining methods. Standard measurement techniques as well as differential thermal analysis and thermomagnetic analysis were employed. Remarkably large variations in hardenability are found among these steels; the variations appear to be due to differences of less than one percent in the nickel content among the samples. These hardenability properties are shown to correlate in a straightforward ... |
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| Mechanical Property Characterization of ESR (Electroslag Remelted) 4353 Steel with a Comparison to ESR 4340 Steel |
APR 87 |
20 pages |
| Authors:
Timothy S. Thomas; Charles F. Hickey Jr; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| The potential enhancement of ballistic and mechanical properties from electroslag remelting has fostered an interest in mechanical property characterizations of electroslag remelted (ESR) steels for Army applications. Mechanical property data are presented for quenched and tempered ESR 4353 and ESR 4340 steels. Hardness decreases from 61.1 to 44.4 High Rupturine capacity as tempering temperature increases from 300 to 900 F for ESR 4353 steel. The ESR 4353 steel exhibits Charpy ... |
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| Effect of Thermal Treatment on the Mechanical and Toughness Properties of Extruded Sic sub w/Aluminum 6061 Metal Matrix Composite |
31 JAN 87 |
|
| Authors:
D. F. Hasson; S. M. Hoover; C. R. Crowe; NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD
|
| Mechanical, instrumented Charpy V-notch (CVN) energy and plane strain fracture toughness properties of SiC whisker reinforced 6061 aluminum metal matrix composite material from an extruded tube have been determined. The effect of thermal treatment and orientation have been studied. The mechanical strength properties are higher than wrought Al 6061 in the T6 condition. CVN energy values, however, were reduced by an order of magnitude Kic fracture toughness of the as-received, ... |
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| Automatic Submerged ARC Welding With Metal Power Additions to Increase Productivity and Maintain Quality |
JUN 1986 |
149 pages |
| Authors:
Phillip D. Thomas; L. A. Craig; NEWPORT NEWS SHIPBUILDING VA
|
| This paper presents the results of an SP-7 Welding Panel research and development project recently completed by Newport News Shipbuilding. The focus of this project was directed toward the evaluation, testing, and qualification of Automatic Submerged Arc Welding (SAW-AU) with metal powder additions for shipyard use. Metal powder additions provide an increase in deposition rate (pounds of weld metal deposited per hour) without an accompanying increase in heat input (kilojoules ... |
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| Brittleness of Reinforced Concrete Structures under Arctic Conditions |
MAY 86 |
|
| Authors:
Lauri Kivekaes; Charles J. Korhonen; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| The behavior of reinforced and unreinforced concrete beams was studied under impact loading at low temperatures, and the results were compared to the behavior of reinforcing steel (rebar) in Charpy-V impact tests. Transition temperatures as low as -30 C were obtained for the rebars in the Charpy-V tests, whereas no brittle failures occurred in the rebars in the reinforced concrete beams at temperatures as low as -63 C, even in ... |
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| Mechanical Property Development in Hot Isostatic Pressed (HIP) Low Alloy Steel Powder |
JAN 86 |
|
| Authors:
Peter Thornton; John Senick; John Atchinson; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY CLOSE COMBAT ARMAMENTS CENTER
|
| The mechanical properties of a low alloy steel gas atomized powder, which was hot isostatically pressed (Hipped) to full density, were developed using typical commercial heat treatment practices. Tempering temperatures were varied systematically from 1000 F to 1200 F and the tensile and impact properties evaluated along with the corresponding microstructural conditions. Yield strengths on the order of 180,000 psi accompanied by low temperature, impact toughness values of 18-20 ft-lb ... |
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| Material Property and Fracture Testing of 7075-T6 Extruded Aluminum |
NOV 85 |
|
| Authors:
M. A. Scavullo; J. H. Underwood; J. A. Kapp; J. J. Zalinka; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY CLOSE COMBAT ARMAMENTS CENTER
|
| The results of an experimental investigation into the material properties of 7075-T6 extruded aluminum used in the production of sabots for kinetic energy projectiles are presented. A comparison is made of two suppliers' materials, and a test is described that will show a difference exists in the two suppliers' materials. |
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| Assessment of J-R Curves Obtained from Precracked Charpy Samples |
SEP 85 |
27 pages |
| Authors:
J. A. Kapp; M. I. Jolles; ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
|
| J-R curves were determined for five materials (7075-T651; 2024-T351; HY130; HY80; and A723, Class 1, Grade 4) using precracked Charpy samples and standard size C(T) and SE(B) samples. Crack growth in the Charpy samples was estimated using the load drop method of analysis of the load displacement trace, and crack extension in the C(T) and SE(B) specimens was determined using the electric potential method. The results show that physical crack ... |
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| Reliability and Life Prediction Methodology - M60 Torsion Bars |
JUN 85 |
|
| Authors:
R. S. Barsoum; W. M. Bethony; R. H. Brockelman; H. P. Hatch; C. F. Hickey Jr; ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
|
| The life prediction and reliability assessment of the M60 tank torsion bars were obtained from applying a methodology involving several disciplines. The disciplines included: structural mechanics, fracture mechanics, statistical reliability, mechanical testing, nondestructive examination (NDE), quality assurance (QA), and metallurgical and fractographic evaluations. The methodology was applied in order to obtain a procedure for increasing torsion bar life and enhance the reliability of the M60 tank. U.S. Army reliability performance ... |
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| Higher Strength Steels Specially Processed for High Heat Input Welding |
FEB 1985 |
54 pages |
| Authors:
I. L. Stern; M. Wheatcroft; D. Y. Ku; R. F. Waite; AMERICAN BUREAU OF SHIPPING NEW YORK
|
| The principal objective was to determine the suitability of specially treated and processed ABS Grade EH36 steels for welding with high heat input welding processes. The project EH36 steel plate has demonstrated the suitability of versions of ABS Grade which are specially suited for marine applications where resistance to HAZ degradation is of concern. Use of these steels should provide for welding of EH36 steel with the high deposition rate ... |
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| J-R Curve Determination Using Precracked Charpy Specimens and the Load- Drop Method for Crack Growth Measurements |
APR 1984 |
|
| Authors:
J. A. Kapp; ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
|
| J-R curves for two aluminum alloys, a titanium alloy and a high strength-low alloy steel at two different strength levels were determined using precracked Charpy specimens. Three methods were used to measure crack growth: (1) multi-specimen, (2) compliance unloading, and (3) the load-drop method. The load-drop method assumes that crack growth occurs only after peak load has been attained and the amount which the load decreases after peak load is ... |
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| Observations on the Aus-Quenching of Gun Steel and Related Properties |
MAR 1984 |
|
| Authors:
C. J. Nolan; ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
|
| A reforged tube section was aus-quenched and tempered. Tensile and Charpy V-notch properties were determined at three locations in the forging, as well as the parent tube. No significant differences were observed in the strength, ductility, or toughness of the aus-quenched forging as compared to the conventionally heat-treated parent tube. It was further determined that a tempered martensitic microstructure was obtained in all sections for both methods of heat treatment. ... |
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| Development of an Impact Resistant Test Method for Polycarbonate |
FEB 1984 |
|
| Authors:
K. I. Clayton; G. J. Stenger; B. S. West; P. E. Johnson; DAYTON UNIV OH RESEARCH INST
|
| Polycarbonate offers many advantages as a structural transparency material, having excellent impact resistance as well as acceptable optical and thermal properties; however, one of the difficulties in evaluating impact resistance of polycarbonate is the lack of a universally accepted and standardized test method. Some transparency vendors rely on the falling weight impact test which yields good qualitative results. However, to date these falling weight impact tests have been performed under ... |
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| Superplastic Bonding and Ultrahigh Carbon Steel Laminated Composites |
15 DEC 1983 |
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| Authors:
O. D. Sherby; D. W. Kum; J. Wadsworth; B. C. Snyder; STANFORD UNIV CA DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Ferrous laminated composites based on ultrahigh carbon (UHC) steel have been successfully manufactured by rolling bonding below the A1 transition temperature. This procedure results in the development of sharp and discrete layer boundaries since no interdiffusion occurs during rolling. Good bonding is achieved because of the presence of ultrafine grains in the UHC steel. Mechanical properties of the composites have been evaluated for their charpy V- notch impact properties and ... |
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| Characterization of Submerged-Arc and Gas-Metal-Arc Weldments in HY-100 Steel |
DEC 1983 |
|
| Authors:
A. E. Therrien; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Unsatisfactory weld toughness in submerged arc welded (SAW) HY-100 steel weldments precludes this process from large scale HY-100 shipbuilding production efforts. The gas metal arc welding (GMAW) process produces acceptable weldments in HY-100 steel. Optical, scanning electron and transmission electron microscopy were utilized to characterize and compare the microstructure in the last pass in each weldment for each process. The SAW weldment contains a coarse- upper bainitic microstructure and the ... |
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| Characterization of Selected Properties for Alumina-Aluminum Metal Matrix Composites |
SEP 1983 |
27 pages |
| Authors:
T. J. Kler; D. T. Ostberg; ARMY TANK-AUTOMOTIVE CENTER WARREN MI
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| Alumina-Aluminum Metal Matrix Composite Material, known by the trade name Fiber FP/Aluminum and manufactured by E.I. DuPont DeNemours, was evaluated for the following selected properties: Microstructural integrity, tensile strength, fatigue life, charpy impact resistance, and abrasion resistance. The Fiber FP/Aluminum was examined as a possible material alternative for track component application. (Author) |
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| Split Heat Mechanical Property Comparison of ESR (Electroslag Remelting) and VAR (Vacuum Arc Remelting) 4340 Steel. Revised |
MAY 1983 |
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| Authors:
C. F. Hickey Jr.; A. A. Anctil; ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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| This report addresses a mechanical property characterization of a split argon-oxygen decarburized (AOD) heat of 4340 steel which was further processed by vacuum arc remelting (VAR) and electroslag remelting (ESR) into 12. 7 cm (5 inch) square forgings. Properties examined were hardness, tensile, Charpy V-notch impact, and fracture toughness as a function of tempering temperature over the range of 163 C (325 F) to 649 C (1200 F) for both ... |
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| Gun Tube Extrusion |
APR 1983 |
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| Authors:
R. A. Farrara; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
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| Hollow, two diameter, thick walled cylinders were produced via the hot extrusion process by the Curtiss-Wright Corp., Buffalo, New York. The material was gun steel (4335V modified) produced by Electralloy Corp., Oil City, PA, in an argon-oxygen decarburization (AOD) vessel. The extrusions were heat treated to develop mechanical properties required for the 105mm M68 gun tube per the Specification MIL-S-46119. Mechanical properties (tension, charpy V-notch and fracture toughness specimens) were ... |
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| Work-in-Progress Presented at the Army Symposium on Solid Mechanics, 1982 - Critical Mechanics Problems in Systems Design |
SEP 1982 |
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| Authors:
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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| In this report we discuss the work performed on the main component of the suspension system, the torsion bars. Torsion bars in the tank are designed to be mainly subjected to torsional loads, however, actual loading is feared to have some other stress components. In the first phase of the failure analysis, a bar which failed in the field was obtained. The examinations performed on the bar were: Magnetic flux ... |
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| Evaluation of the Relative Hydrogen Embrittlement Susceptibility of ESR/VAR 4340 Steel, |
SEP 1982 |
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| Authors:
L. Raymond; C. Beneker; METTEK LABS SANTA ANA CA
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| A test program was conducted to compare the relative hydrogen embrittlement susceptibility of 4340 steel with ESR and VAR remelt methods. The issue of ESR's susceptibility to hydrogen embrittlement arose when unexpected difficulties arose with critical parts on Army helicopter programs. High strength 4340 ESR steel is used in the control system actuators of these helicopters because of 4340 ESR's demonstrated superior ballistic tolerance. The conclusion was reached that 4340 ... |
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Reports by Keyword(s)
CHARPY IMPACT TESTS
