| Measurement of Transient Flow Induced by a Berthing barge |
MAR 1998 |
44 pages |
| Authors:
E. T. Huang; D. A. Davis; C. H. Kim; H. C. Chen; NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
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 | The Navy is developing a numerical solution that uses the Chimera RANS/free-surface technique to address the critical features of transient flow around a berthing ship. Experimental data required to validate the ship berthing model were collected during scale model tests conducted at a shallow water model basin. The test setup included a towing carriage traveling on rail guides used to power a scale model barge toward the ... |
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| Specimen Geometry and Extended Crack Growth Effects on J(sub I)-R Curve Characteristics for HY-130 and ASTM A533B Steels |
MAY 83 |
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| Authors:
D. A. Davis; M. G. Vassilaros; J. P. Gudas; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD
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 | 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 ... |
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| Evaluation of the Tentative J(sub I)-R Curve Testing Procedure by Round Robin Tests of HY130 Steel |
NOV 82 |
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| Authors:
J. P. Gudas; D. A. Davis
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| A round robin test program of the tentative test procedure for the determination of the plane strain J-integral crack growth resistance curve was conducted under the auspices of ASTM Committee Section E24.08.03. This test program used HY130 steel and involved 19 participating laboratories in seven countries. Tests were carried out with both 25.4 mm (1-in) thick compact specimens and three-point bend bar specimens. The results showed that the tentative procedure ... |
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| Corrosion Fatigue Crack-Growth Characteristics of Several HY-100 Steel Weldments with Cathodic Protection |
OCT 1982 |
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| Authors:
D. A. Davis; E. J. Czyryca; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD SHIP MATERIALS ENGINEERING DEPT
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| The corrosion fatigue crack-growth properties of several types of HY- 100 steel weldments were studied, primarily in an environment of seawater with cathodic protection by zinc anode. Shielded metal-arc and gas metal-arc of both pulsed and spray-arc processes, and submerged-arc weldments were included. The fatigue crack growth tests were conducted using compact specimens removed from the weldments to confine the path of the growing crack in all weld metal. Constant ... |
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| Corrosion Fatigue Crack-Growth Behavior of HY-130 Steel and Weldments |
NOV 81 |
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| Authors:
D. A. Davis; E. J. Czyryca
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| Fatigue crack propagation was studied in HY-130 steel base plate, as- deposited shielded metal-arc weld metal, and gas metal-arc weld metal using compact specimens. The effects of seawater, cathodic protection, frequency and hold time were investigated. The results indicated that saltwater increased crack-growth rates in HY-130 base plate at stress intensity factors below 60 ksi in (super 0.5). No significant effects of cyclic load-wave pattern or of frequency (0.10 to ... |
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| Investigation of Specimen Geometry Modifications to Determine the Conservative J(sub I)-R Curve Tearing Modulus Using the HY-130 Steel System |
AUG 79 |
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| Authors:
J. P. Gudas; J. A. Joyce; D. A. Davis; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD
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| 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 ... |
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| Container Off - Loading and Transfer System (COTS) - Advanced Development Tests of Elevated Causeway System. Volume IV. Fender System and Lighterage Motions. |
JUL 1977 |
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| Authors:
D. A. Davis; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| The design, fabrication, and testing of a boat fender, which is compatible with a transportable elevated causeway system for unloading container-bearing lighterage, are described. The pile-restrained, floating fender is comprised of a standard 1x15 string of Navy NL pontoons faced with commercically available foam-filled cushions. Each fender unit has an overall length of 90.0 feet (27.4 m), a breadth of 11.0 feet (3.4 m), and a depth of 5.0 feet ... |
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| THE CERAMIC GAS TURBINE--A CANDIDATE POWERPLANT FOR THE MIDDLE-AND LONG- TERM FUTURE |
FEB 76 |
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| Authors:
A. F. McLean; D. A. Davis; FORD MOTOR CO DEARBORN MICH
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| The paper reviews our problems of energy availability in the middle and long-term future as well as our problems of environmental pollution and materials availability. Against this background the ceramic gas turbine engine is examined and shown to have potential as an attractive candidate powerplant for both the middle and long-term future. The paper reports on Ford's ceramic gas turbine program which is a systems development program encompassing all aspects ... |
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| The Motion of Floating Advanced Base Components in Shoal Water -- A Comparison between Theory and Field Test Data. |
JAN 1975 |
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| Authors:
D. A. Davis; H. S. Zwibel; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| As part of the Navy's program to develop mobile port facilities, an analytical model has been developed to compute the relative motion between vessels in regular and random seas. The model, which considers all six degrees of vessel motion, is based on strip theory and is suitable for analyzing all single hull, linearly moored vessels. Ship motion and wave data obtained during recent Offshore Discharge of Containership 2 (OSDOC II) ... |
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| Ocean Facilities Engineering Criteria and Methods Program. Phase IA, Report Number 4. Area of Technology: Lowering and Lifting Systems, |
DEC 1974 |
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| Authors:
D. A. Davis; L. W. Hallanger; R. D. Hitchcock; NAVAL FACILITIES ENGINEERING COMMAND WASHINGTON DC CHESAPEAKE DIV
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| Lowering and lifting systems for fixed ocean facilities are described. A comprehensive breakdown of lifting-system technology is given in terms of all possible classes and subclasses of equipment and parameters, each class and subclass being described by relatively terse verbal statements, including pertinent numerical and mathematical information. The report is not an engineering manual, but rather a tutorial exposition for managers and program planners in ocean engineering and construction. A ... |
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| Mobile Ocean Basing Systems: The Concrete Semi-Submersible Platform. |
JUL 1973 |
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| Authors:
D. A. Davis; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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| A study was made to investigate the feasibility of substituting concrete for steel as the primary construction material in a self-propelled semi-submersible platform. Of the configurations considered, eleven were determined to meet all of the study design criteria. It is concluded that the concept is feasible provided that: a deck not exceeding 375 lbs per square foot dead weight is used, an underneath deck clearance of 30 to 40 feet ... |
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| Properties of Modified Nitinol Alloys. |
MAR 1973 |
28 pages |
| Authors:
J. P. Gudas; D. A. Davis; F. J. Gomba; NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD
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| This investigation deals with the production and testing of 11 modified Nitinol alloys. Corrosion properties, mechanical properties, processing parameters, and microstructural characteristics have been determined as the function of alloy type. Results indicate that substitutional additions of Mo, Fe, and Cr are beneficial in preventing localized crevice corrosion. Further studies are being undertaken to determine long-term corrosion behavior of alloys produced as well as to broaden the data base describing ... |
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| Measurement of Linear Burn Rates of Heat Producing Systems. |
SEP 1971 |
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| Authors:
D. A. Davis; Eric R. Lefstad; Robert L. McKenney Jr; AIR FORCE ARMAMENT LAB EGLIN AFB FLA
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| A photocell apparatus has been designed to measure the linear burn rate of heat producing systems. The device consists of an electrical unit and a precision viewing unit containing two photocells. A bar shaped sample is ignited at one end, and as the reaction proceeds down the bar, it is sensed by the photocells. The resulting decreases in resistance at the photocells are recorded as two essentially parallel lines. The ... |
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| FEASIBILITY STUDY AND COMPARATIVE ANALYSIS OF DEEP OCEAN LOAD HANDLING SYSTEMS. |
DEC 1969 |
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| Authors:
D. A. Davis; M. J. Wolfe; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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| Nine candidate systems for lowering and raising negatively buoyant loads in the deep ocean were compared and evaluated by means of a systems effectiveness model. For both load ranges considered -- 20 to 100 tons and 400 to 600 tons at 6,000 feet -- a lift system employing a ship with pipe string suspension medium was considered to be the most feasible approach. Accurate positioning of heavy modular loads can ... |
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| REINFORCED PLASTIC LANDING FLOAT AND BROW-DESIGN, FABRICATION, AND INSTALLATION. |
DEC 1968 |
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| Authors:
D. A. Davis; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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| A promising new fiberglass reinforced plastic landing float and companion brow have been designed, built, and installed, and are now undergoing in-service tests at the Fleet Landing, Naval Station, San Diego, California. The float, which measures 60 by 14 feet in plan, and the brow are built with a unique glass-wrapped, polyurethane-foam-core planking material. The resultant float is light (26,000 pounds), strong, and unsinkable. The float will undergo tests for ... |
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| HYDRAULIC-PNEUMATIC FLOATING FENDER - FINAL EVALUATION. |
MAY 1968 |
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| Authors:
D. A. Davis; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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| Two experimental hydraulic-pneumatic floating fenders for a wharf underwent in-service tests at a moderately exposed harbor (San Diego, California) and a protected harbor (Port Hueneme, California) from March 1963 until October 1967. Each fender consists of a wood-steel-plastic bulkhead 50 feet long, 1 foot 8 inches wide, and 7 feet 3 inches high fronted by two air-filled and two water-filled rubber bags, and chains with weights to maintain the total ... |
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| Evaluation of High Impact Polystyrene for Refrigerator Door Liners, |
JAN 61 |
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| Authors:
D. A. Davis; J. V. Schmitz; R. S. Hagan; R. O. Carhart
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| A detailed evaluation procedure, used by General Electric for setting up specifications for high impact polystyrene refrigerator door liners is described. Specification values for mechanical, physical, flammability, elastic and chemical properties of the polystyrene which must be met by the test procedures are presented. (Author, modified). |
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| Impact Testing of High Impact-Thermoplastic Sheet, |
JAN 61 |
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| Authors:
R. S. Hagan; J. V. Schmitz; D. A. Davis
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| A number of commercial and experimental sheet materials, including high impact polystyrene, (HIPS), acrylonitrilebutadiene-styrene, (ABS), rigid vinyl, and high density polyethylene were impact tested by various methods. Comparison data are presented. (Author, modified). |
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Reports by Author
