DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Mixed Mode Fatigue Crack Growth Behavior in a High-Strength Steel.

1993

Authors: Richard E. Link; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The full text of this report is not available and therefore is not for sale. This information is provided for reference purposes only.

Fatigue crack growth behavior in a Ni-Cr-Mo steel under mixed mode loading was investigated. Various models used to predict the mixed mode behavior were evaluated.

Kink-Band Failure Analysis of Thick Composites in Compression.

1993

Authors: E. T. Camponeschi Jr.; J. W. Gillespie Jr.; D. J. Wilkins; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

This article describes an analysis of 6.4-25.4 mm (0.25 - 1.0 in.) thick composite laminates subjected to uniaxial compressive loading that experimentally showed a decrease in strength with increasing thickness. The analysis was performed to determine if the reduction in strength was an intrinsic thickness material effect or if it could be attributed to through-thickness restraint on the specimen caused by the test fixture. The analysis was based on closed ...

Spray Formed Alloy 625 Tubulars

Authors: A. L. Moran; W. A. Palko; C. J. Madden; P. Kelley; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Two series of Alloy 625 tubular preforms were spray deposited to evaluate the sensitivity of the alloy to spray deposition parameters; variations in the metal flow rate, atomization pressure, substrate translation velocity, and melt size were made to determine their effect on the resulting preform microstructure, distribution and percent porosity, and tensile properties; all performs were evaluated in the as-sprayed condition; changing the gas to metal ratio (metal flow rate/atomizing ...

Characterization of the Vibration Damping Loss Factor of Glass and Graphite Fiber Composites,

1991

Authors: Roger M. Crane; John W. Gillespie Jr.; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Vibration damping of laminated composites was determined by the half-power bandwidth method for cantilever beam specimens excited with an impulse excitation. Unidirectional continuous pi over 4 fiber laminates were fabricated from glass/epoxy (S2-Glass/3501-6), graphite/epoxy (AS4/3501 6) and graphite/PEEK to investigate the effect of fiber and matrix properties as a function of frequency, up to 1000 Hz, on the damping of composites. Loss factors for the various composite materials were compared ...

Evaluation of Local Brittle Zones in HSLA-80 Weldments

Authors: T. M. Scoonover; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Both single and double welding thermal cycle simulations to six peak heating temperatures were used to investigate the mechanical properties of six heat-affected zone (HAZ) microstructures in HSLA-80 steel weldments; upper bainite, formed from grain-coarsened austenite, was the only HAZ microstructure found to have low enough toughness to be considered a local brittle zone (LBZ) when present in small local regions; the thermal effects produced by subsequent welding passes were ...

Arc Welding Consumables for HSLA Steels with Yield Strengths of 80 KSI and Above

Authors: Richard J. Wong; Michael D. Hayes; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

An evaluation program was conducted to identify a weld-metal system for gas-metal-arc (GMA) welding HSLA-100 steel; the initial phase of this program consisted of evaluating 16 low-carbon, filler-wire formulations; the electrode composition matrix was based on a four-element, two-level, full- factorial design; the results of mechanical-property screening tests indicated four of the sixteen formulations met both target yield strength and toughness values; a statistical analysis was performed to correlate the ...

Development, Qualification, and Certification of HSLA-80 and HSLA-100 Steels for U.S. Navy Ship Construction

Authors: Ernest J. Czyryca; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

OF THE HY-series high strength steels, traditionaly used in Navy ship construction, requires a number of fabrication controls to prevent weld cracking, which result in high fabrication costs; the Navy initiated the HSLA steel program with a goal of reducing shipbuilding costs; the development, qualification, and certification of HSLA-80 and HSLA-100 steels are described; HSLA-80 steel (MIL-S-24645) was certified for use in ship construction after qualification demonstrated that the low ...

Effect of Whisker Orientation on the Mechanical Properties of Silicon Carbide / Alumina Composites

Authors: A. Srinivasa Rao; Om P. Arora; Ankur Purohit; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Improved Navy Shipboard Anticorrosive Paint Systems,

OCT 1989

Authors: Stephen Hobaica; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Various paints formulated to perform in shipboard sanitary saltwater tanks where paints must resist the effects of cathodic protection, cyclic immersion and drying, are being evaluated. Paints for shipboard machinery and components (e.g. hatch and equipment covers) is another area requiring improved anticorrosive paint systems. For components which can be removed for coating, flame spray aluminum and electrostatic powder coatings are being evaluated. Paints which are easy for the crew ...

The Effect of Weld Metal Diffusible Hydrogen on the Cracking Susceptibility of HY-80 Steel,

JUN 1988

Authors: R. J. Wong; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

An investigation was conducted to characterize the influence of welding variables, such as weld metal diffusible hydrogen content, on the hydrogen cracking resistance of HY-80 steel. The moisture pickup characteristics of several shielded metal-arc welding products were measured by the standard combustion technique. The weld metal diffusible hydrogen level corresponding to the electrode coating moisture was measured by gas chromatography. Implant weldability tests were performed to quantify the cracking resistance ...

An Evaluation of J-R Curve Testing Using Three-Point Bend Specimens

Authors: M. T. Kirk; E. M. Hackett; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

This investigation concerns the accuracy of load-line deflection measurement techniques used in J-integral/R-curve testing of three-point bend specimens. Four methods of load-line deflection measurement were investigated. One method employed a calibrated transducer that gave a direct reading of load- line deflection. The other three methods mathematically related load-line deflection to some other displacement (that is, crack mouth opening displacement, crosshead displacement) measured during testing.

Fusion Welding of High-Strength, Marine-Grade RSP Aluminum Alloys,

1986

Authors: A. M. Leimkuhler; W. E. Lukens; W. A. Palko; E. M. Hackett; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Rapidly solidified aluminum alloys (Al-Zn-Mg-Zr, Al-Zn-Mg-Zr-Cu, Al-Mg-Cr and Al-Mg-Li-Zr) were extruded and electron beam welded to test the properties for marine applications. The tensile and fracture toughness properties are compared to 5456-H111.

The Potentiostatic Technique for Corrosion Studies,

MAR 1985

Authors: H. P. Hack; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

One of the most widely used electrochemical corrosion testing methods is the constant potential, or 'potentiostatic', technique. This paper is designed as an introduction to potentiostatic testing. It first presents the rationale behind potentiostatic testing, and then describes the considerations for conducting simple potentiostatic tests and analyzing the data. Next the distinctions between potentiostatic and other 'constant' potential or current test methods are explained. Finally, a variety of common applications ...

Stress Corrosion Evaluation of Titanium Alloys Using Ductile Fracture Mechanics Technology

NOV 84

Authors: D. R. Anderson; J. P. Gudas; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The objective of this investigation was to assess the feasibility of using J-integral fracture mechanics test techniques to quantify the stress corrosion characteristics of a titanium alloy in seawater. A series of elastic compliance J-integral tests were performed with 1TCT (modified compact tension) specimens of Ti-7Al-2Cb-1Ta in air and under conditions where the crack tip was exposed to seawater. A complementary series of single edge notched cantilever beam tests were ...

Computer Program for Performance and Sizing of a Shell-and-Tube Type Intercooler

13 JAN 1984

Authors: J. Stickley; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Cable Fire Studies Using the Ohio State University Release Rate Apparatus,

17 NOV 1983

Authors: W. Pocock; J. Geremia; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The work reported here, carried out under the Navy's Ship Damage Control Program, was part of an evaluation of the Ohio State University release rate apparatus (rra), to determine its suitability for establishing smoke and flammability standards for shipboard cables. As a first step, a study was made of the relationship between four basic parameters and burning and smoke-generation of test cables in the rra. A statistical method was used ...

Specimen Geometry and Extended Crack Growth Effects on J(sub I)-R Curve Characteristics for HY-130 and ASTM A533B Steels

MAY 83

Authors: D. A. Davis; M. G. Vassilaros; J. P. Gudas; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

An evaluation of the ductile fracture toughness and J(sub I)-R curve properties of HY-130 and ASTM A533B-HSST-03 steels in response to systematic variations of thickness and crack length in the side grooved compact specimen geometry was carried out. A series of 2T compact specimens were produced to varying thicknesses, and with various fatigue crack lengths. Elastic compliance J(sub I)-R curve tests were performed, and analyses of J(sub Ic), the slope ...

Exposure Time Effects on Current Densities of Polarized Marine Materials,

APR 1983

Authors: H. P. Hack; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Design of cathodic protection systems for marine structures is strongly dependent on the current density demand of the materials being protected. The effect of exposure duration from 5 minutes to 120 days is presented for uncoated 90-10 Copper-Nickel (C70600), Monel 400 (N04400), Inconel 625 (N06625), Navy M-bronze (C92200), Nickel-Aluminum Bronze (C95800), and HY-80 Steel. Cathodic currents were found to stabilize after 30 days exposure to a value of 5-12 A/sq ...

Dislocation Distribution in Plastically Deformed Metals

Authors: I. R. Kramer; R. Pangborn; S. Weissmann; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The distribution of dislocations in the surface layer and in the interior and its affect on work hardening and fatigue fracture has been described. The dislocation structure in the interior is unstable without the presence of the surface layer. It is shown that fatigue damage can be measured when a sufficiently penetrating X-ray source is used.

COANDA Control of a Thick Wall-Jet in the Static Case

NOV 1982

10 pages

Authors: G. G. Hudson; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The full text of this report is available for sale.

The thrust from a turbofan engine top-mounted on a circulation control (CC) wing was recently found to vector downward (and in some cases more than 90 degrees downward, producing thrust reversal) when the CC Coanda jet is activated. Experimental research was undertaken to provide a basis for understanding this phenomenon, for projecting its practical limits, and for exploiting its benefits. Within the range of parameters investigated, thrust- turning performance tended ...

Experimental Investigation of Tearing Instability Phenomena for Structural Materials

AUG 82

Authors: M. G. Vassilaros; J. P. Gudas; J. A. Joyce; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The objective of this investigation was to extend the range of tearing instability validation experiments utilizing the compact specimen to include high toughness alloys. J-Integral tests of ASTM A106; ASTM A516, Grade 70; ASTM A533B; HY-80; and HY-130 steels were performed in a variably compliant screw-driven test machine. Results were analyzed with respect to the materials J(sub I)-R curves and various models of T(sub applied) for the compact specimen. Tearing ...

Comparative Galvanic Corrosion Effects of Noble Metals on Bronze in Seawater,

MAR 1982

Authors: D. M. Aylor; H. P. Hack; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Galvanic couples of Bronze E8 coupled to alloy 625, CN-7M stainless steel, and Monel were exposed in seawater flowing at 5 m/s for 30 and 90 days. Similar couple behavior was observed in all cases, implying that similar cathodic reaction kinetics are taking place on all three cathodes. This implies that the relative galvanic effect of these three cathodic materials on any one material more anodic than Monel would be ...

Strength and Toughness of Binary Ti-Ni and Ti-Mo Alloys

Authors: I. L. Caplan; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Binary titanium alloy plates, containing 0.1, 2, 5 or 7 wt.% Ni, or 0.5, 6 or 12 wt.% Mo, were vacuum annealed for one hour at 700 C to remove hydrogen. The tensile and impact properties are given for the alloys for several heat treating and aging conditions. The Ti-6Mo binary of the alloys examined had the best combination of strength and toughness properties.

Review of Dealloying of Cast Aluminum Bronze and Nickel-Aluminum Bronze Alloys in Seawater Service,

APR 1981

Authors: R. J. Ferrara; T. E. Caton; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

A review of dealloying of aluminum-bronze (AB) and nickel-aluminum bronze (NAB) castings used by the U.S. Navy is provided. Relationships among dealloying, alloy composition and microstructure are discussed. The use of an eddy-current test method to determine dealloying depth is discussed and an assessment of an existing nondestructive inspection procedure is provided. The results of 6-months and 24-months seawater corrosion tests on four cast NAB alloys are reported. All four ...

Corrosion of Naval Sea Systems. An Overview

NOV 80

Authors: G. A. Wacker; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Examples were selected to demonstrate the use of the 'flow through' approach to accomplish technology transfer from laboratory R&D and serve to illustrate the variety and complexity of corrosion problems to illustrate the variety and complexity of corrosion problems encountered in NAVSEA systems. From the standpoint of environment, NAVSEA corrosion problems are unique and do not relate directly to the corrosion activities of the other services.

Marine Durability of a Graphite/Epoxy Composite Subjected to Static and Fatigue Loading

Authors: A. Macander; M. Silvergleit; H. P. Edelstein; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Hybrid graphite/epoxy laminates were tested in seawater in static, three point loading and fatigue loading under compressive, tensile and flexural conditions. Seawater absorption and the effect of room temperature, seawater immersion on interlaminar shear strength and flexure strength and modulus are shown. SN curves are shown for the three types of cyclic loading.

Investigation of Specimen Geometry Modifications to Determine the Conservative J(sub I)-R Curve Tearing Modulus Using the HY-130 Steel System

AUG 79

Authors: J. P. Gudas; J. A. Joyce; D. A. Davis; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The objective of this work was to investigate the effects of face grooves and crack length variations of J(Sub Ic) and the tearing modulus of HY- 130 steel. Compact specimen geometries (1TCT) with crack length ratios of 0.55, 0.65, and 0.8, and face grooves of 12.5 percent and 25 percent total cross section reduction were tested using a computer interactive unloading compliance test technique. Results of these tests showed that ...

Proceedings of the Ship Control Systems Symposium (5th), Held at U. S. Naval Academy, Annapolis, Maryland on October 30 - November 3, 1978. Volume 1

03 NOV 78

Authors: G. E. Holland; E. Fitzpatrick; P. Reeves; J. B. Spencer; J. F. Carruthers; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Partial contents: Automation - Salvation or Delusion; Ship Automation in the Royal Navy; SHINPADS - A ship integration concept; Manpower Requirements in Systems Acquisition; Automated Machinery Control for the FFG-7; Specification of a Control System for a New Marine Gas Turbine; Evaluation of Simplified Propulsion Controls for Gas Turbine Powered Naval Ships; New Ship Control Design Criterion for Improving Heavy Weather Steering; Advanced Ships's Autopilot System by a Stochastic Model; ...

Proceedings of the Ship Control Systems Symposium (5th), Held at U. S. Naval Academy, Annapolis, Maryland on October 30 - November 3, 1978. Volume 2

03 NOV 78

Authors: P. Martin; N. J. Locke; M. A. Phelps; K. Karasuno; S. Matsuki; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Partial contents: Ship Handling Simulator; Ship Control Centre Training Facilities for the Royal Navy; Ship Maneuverability Transducer Controlled by Mini-Computer for Training Ship - Onboard ship handling simulator; Modern Control Theory for Dynamic Positioning of Vessels; Design and Simulation of Navigation and Ship Control Algorithms for a Minesweeper; Automatic and Manual COntrol of the 'Tripartite' Minehunter in the Hover and Track Keeping Modes - a Preliminary design; Reversing Dynamics of ...

Proceedings of the Ship Control Systems Symposium (5th), Held at U. S. Naval Academy, Annapolis, Maryland on October 30 - November 3, 1978. Volume 3

03 NOV 78

Authors: C. Bruce; A. Baxter; I. W. Pirie; J. B. McHale; R. Whalley; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Partial contents: Plant Control and Surveillance Using a Distributed Processor Based Control System; Evaluation of Digital Technology for Use in Naval propulsion Control Systems; Formulation of a Computer Strategy for Real- time, Shipborne, Digital Systems; Operational Readiness Monitoring System; Evaluation of a Steering System through a Failure Mode and Effect Analysis; Conceptual Design for a Shipboard Machinery Performance Monitoring System; Optimal Personnel Redundance on a Warship; An Optimising Function for ...

Proceedings of the Ship Control Systems Symposium (5th), Held at U. S. Naval Academy, Annapolis, Maryland on October 30 - November 3, 1978. Volume 4

03 NOV 78

Authors: D. E. Labbe; F. W. Gibson; Y. T. Chan; J. B. Plant; N. Lines; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Partial contents: AO177 Simulation of Ship Propulsion and Boiler Systems; Digital Control of Gas Turbine-Driven Ships in the Maneuvering Region; Evaluation of a Programmable Controller and Sequencer in a Shore Trials Environment; Mansim - A Combined Simulator and Simulation System for Ship Steering; Considerations Leading to the Development of a Machinery Control Evaluation Centre; Training Simulators for Ship Propulsion Plants; Real-Time SImulation of a Steam Propulsion Plant; A Structural Approach ...

Proceedings of the Ship Control Systems Symposium (5th), Held at U. S. Naval Academy, Annapolis, Maryland on October 30 - November 3, 1978. Volume 5

03 NOV 78

Authors: K. E. Williams; E. Schubert; P. Shipley; E. M. Connelly; B. M. Olson; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Partial contents: A New Look at Some Old Ship Handling Problems Employing CAORF's Man-in-the-Loop Ship Simulator; Red or White Light on Ship Bridges? Ships Pilotage in Britain - Past, present, and future; Criteria Optimized by Collision Avoidance Strategies; FFG-7 Class Propulsion Controls - Design and dynamic performance; Simulation and Performance Evaluation of a Mine Countermeasures Vessel Concept; Propulsion Control Optimization of Controllable Reversible Pitch Propeller Driven Ships; A Microprocessor-Based Stabilizer ...

Proceedings of the Ship Control Systems Symposium (5th), Held at U. S. Naval Academy, Annapolis, Maryland on October 30 - November 3, 1978. Volume 6

03 NOV 78

Authors: E. G. C. Burt; L. Rigby; M. Blanke; W. Malone; W. F. Clement; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Partial contents: Underwater Electromagnetic Transmission and Its Application to Ship Position Control; Identification of Nonlinear Speed Equation from Full Scale Trials; Elements of an Integrated Control System for Large Surface Effect Ships (SES); Manual Steering of a Simulated Surface-Effect Ship; and System Analysis Techniques for Designing Ride COntrol Systems for SES Craft in Waves.

Proceedings of the Ship Control Systems Symposium (5th), Held at U. S. Naval Academy, Annapolis, Maryland on October 30 - November 3, 1978. Supplement

03 NOV 78

Authors: D. E. Mann; W. W. Rosenberry; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Partial Contents: Ship System Integration for Future Design, and An Analysis of the Technology Contributions From the First Five Ship Control Systems Symposia.

CORROSION OF NAVAL SEA SYSTEMS--AN OVERVIEW

DEC 77

Authors: G. J. Danek; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

This overview presents a broad treatment of NAVSEA corrosion problems. Examples are given to illustrate the variety of environment/ application combinations that can be encountered and the influence that these factors can exert on corrosion behavior of materials. Much of the material in this paper is very specific to NAVSEA equipment and may not come up again during this conference.

CORROSION PROBLEMS ASSOCIATED WITH SHIPBOARD WASTE INCINERATION SYSTEMS

DEC 77

Authors: G. Wacker; W. L. Wheatfall; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

This paper reviews the problems associated with the incineration of shipboard wastes. The high chrome nickel base alloys IN690 and IN671 appear to be the most promising candidate materials to attain the desired linear lifetime of 10,000 hours in these systems. The desire to develop a total integrated waste system capable of high temperature disposal of wet garbage, waste oil, sewage sludge, industrial wastes and solid refuse will necessitate an ...

INVESTIGATION OF THE FRACTURE OF NEAR-ALPHA TITANIUM ALLOYS IN HIGH PRESSURE HYDROGEN ENVIRONMENTS,

1976

Authors: T. B. COX ; J. P. Gudas; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Stress-Relief Heat Treatment of Manganese-Nickel-Aluminum Bronze and Manganese-Bronze Weldments

JAN 1975

26 pages

Authors: Charles A. Zanis; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Tensile properties, weldability, general corrosion, and corrosion- fatigue properties were determined as a function of stress-relief heat treatment for both cast Mn-Ni-Al bronze and manganese-bronze propeller alloys. It was found that Mn-Ni-Al bronze is susceptible to stress-corrosion cracking in the as-welded heat-affected zone. Stress-relief heat treatments in the range of 700 to 1200 deg F were effective in eliminating the stress-corrosion cracking in this alloy. Manganese-bronze weldments exhibited poor weldability ...

Corrosion of Aluminum Alloys in Exfoliation-Resistant Tempers Exposed to Marine Environments for 2 Years

NOV 1974

23 pages

Authors: Ernest J. Czyryca; Harvey P. Hack; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The corrosion behavior of 5086, 5083, and 5456 aluminum alloys in H116 and H117 tempers was evaluated after 2 years of exposure to three marine environments; namely, fully submerged in sea water, splash and spray zone, and marine atmosphere. The alloys displayed good corrosion resistance with no exfoliation or pitting observed. Panels of the same alloys in a sensitized condition exposed to the same environments showed some pitting and edge ...

Improved Shipboard Greases, Horizontal Shaft Investigation.

SEP 1974

Authors: L. G. Schneider; P. Lassovszky; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

A late technology grease (now qualified under specification MIL-G-81322A) was evaluated for long service life in size 315 ball bearings in an apparatus simulating severe service in horizontal shaft Navy shipboard motors. The grease gave an indicated G-10 life (the life 90% of bearings would be expected to exceed without lubrication failure) of over 11,000 hours. The corresponding life for a MIL-G-18709A grease was 3,997 hours and for a MIL-G-24139 ...

Water-Resistant Greases for Submerged Sliding-Contact Surfaces.

AUG 1974

Authors: Leonard G. Schneider; Peter Lassovszky; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The development of methods and apparatus for evaluating greases as lubricants for sliding-contact bearings in underwater environments are described. Results of examining 43 selected greases indicate that those containing base oils of higher viscosity are more resistant to water wash off, and develop higher torques between sliding-contact surfaces at low temperatures, than greases containing oils of lower viscosity. On the basis of the results, it is recommended that greases be ...

Pollution Abatement Disposability Ratings of Packaging Materials Used Aboard United States Naval Ships. Volume 2

JAN 1974

110 pages

Authors: Harold E. Achilles; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

This report presents a catalog of fact sheets giving the disposability ratings of various packaging materials. Adhesives, bags and sacks, barrels and kegs, barrier materials, boxes, bulk packaging materials, cans, cleaning materials, coating compounds, miscellaneous containers, crates, cushioning materials, dessicants, drums, gasket materials, indicators, miscellaneous packaging materials, packaging hardware, pallets, preservatives, tapes, volatile corrosive inhibitors, and wrapping materials are appraised. (A. di M.-PL)

Electromagnetic Log Voltage Simulator with Sound-Powered Phones.

SEP 1973

Authors: Henry K. Whitesel; Herbert A. Palmer; Lyman W. Griswold; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

An instruction manual is presented for the electromagnetic log voltage simulator. The electromagnetic log voltage simulator is designed to assist in the adjustment, calibration, and troubleshooting of the underwater electromagnetic log system by providing a calibrated voltage which can be directly connected to the indicator/transmitter. The electromagnetic log voltage simulator can be substituted for the rodmeter on all shipboard installations of the electromagnetic log system regardless of type or manufacture. ...

Superconductive D-C Ship Drive Systems,

JUL 1973

Authors: T. J. Doyle; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Superconductors are materials which exhibit zero electrical resistance at temperatures near absolute zero, supporting current densities in the order of 100,000 amperes per sq cm in the filamentary wire form. When wound into magnets helium cooled superconductors provide the compact, high flux source necessary for small, efficient electric machines. In ship drive applications, the use of high-power density superconductive generators and motors provide great flexibility of arrangement and of operation. ...

Computer Simulation of Ship Underway Replenishment, Feasibility Study

MAR 1973

40 pages

Authors: Samuel H. Brown; Lanny J. Puckett; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The report concludes that a computer simulation of ship underway replenishment can be developed. A system of linear equations of motion for describing two ships maneuvering on essentially parallel courses is chosen as the basic equations for the mathematical model to be used in the computer simulation. The derivation of these linear equations is presented. A better representation using nonlinear equations of motion will be considered in a later phase ...

The Template Method of Illumination Design.

MAY 1972

201 pages

Authors: G. W. Turner; J. P. Sinay; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

This report describes a simple procedure for designing red lighting systems for use during night shipboard underway replenishment. Use of this method, which employs a federal stock lighting fixture, produces a lighting system layout plan that can be used to verify and check the adequacy of the lighting system. The method is sufficiently general that it can be utilized to design various lighting systems using other types of lighting fixtures. ...

Solid-State Device Development for High-Pressure Environment

APR 1972

49 pages

Authors: M. J. Siegmann; V. W. Pugliese; D. E. Gilbert; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The report describes the beginning of a research program devoted to the study of electrical and electronic components for deep ocean use. Approaches to operation of electrical and electronic equipment in the ocean environment include: Hard-shell enclosures maintained at normal air pressure. Soft shell with a pressure compensating fluid. Free-flooded equipment. The report discusses the use of soft shells with a pressure-compensating fluid in which the equipment is immersed, and ...

Deep Ocean Microbiological Studies. Part I. Physiological Interaction of Hydrostatic and Osmotic Pressure

NOV 1970

16 pages

Authors: E. C. Fischer; G. L. Liberatore; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

High hydrostatic compression exerts depressive physiological effects on various microorganisms, including protozoans. In this report, experiment results are presented which show that some effects of high hydrostatic pressure are negated by increased osmotic pressure of the media (with salt or sucrose). In water with a salinity of 35 parts per thousand or osmotically equivalent sucrose concentration, the effects of 525 kilograms per centimeter square pressure (equivalent to an ocean depth ...

INVESTIGATION OF THERMOELECTRIC PROPERTIES OF LIQUID METALS

JUN 1969

75 pages

Authors: Jr Anderson Hugh Grant; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

An apparatus was designed and developed for measuring Seebeck potentials and electric resistivities of corrosive liquids up to temperatures of about 600C. A complete description of the test apparatus and the procedures used in its initial operation up to 600C are given. Experimental results for the absolute Seebeck coefficients of sodium and potassium are in good agreement with published values from previous investigations performed at temperatures up to 400C. The ...

A STATISTICAL ANALYSIS OF HOT-CORROSION TESTS OF SOME EXPERIMENTAL AND COMMERCIAL SUPERALLOYS

JAN 1969

47 pages

Authors: R. Field; D. J. Fisk; H. von E. Doering; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

The use of gas turbines in marine power plants depends in part on the development of superalloys which not only possess high temperature mechanical properties but also resist the corrosive effects of sea salt. A total of 137 experimental and commercial superalloys, both nickel and cobalt based, were exposed in burner rigs where controlled amounts of sea salt were added to the combustion products of sulfur-containing diesel fuel; test temperatures ...