| Evaluation of Four Drive Chains for Service in Sea Water |
09 JUL 1981 |
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| Authors:
Fred R. Stonesifer; NAVAL RESEARCH LAB WASHINGTON DC
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 | Four types of drive chains (two roller chains and two leaf chains) were evaluated for use in sea water environment. The chain pins were tested in static three-point bend tests. Sections of the chains were cyclicly loaded to failure after being sustained under static loading for two or four weeks in sea water. The strongest 3 x 4 leaf chain also provided the longest life at the chosen cyclic loads. ... |
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| KIC Size Effect Study on Two High-Strength Steels Using Notched Bend Specimens. |
NOV 1974 |
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| Authors:
Fred R. Stonesifer; NAVAL RESEARCH LAB WASHINGTON D C
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| Five methods are used to calculate plane strain fracture toughness (K sub Q) values for bend-specimens of various sizes from two high-strength steels. None of the methods appeared to satisfactorily predict valid stress intensity factor (K sub IC) values from specimens of sizes well below that required by E399 standard tests. |
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| Characterization of GTA Weldments in 10Ni-8Co-2Cr-1Mo Steel, |
JUN 1972 |
36 pages |
| Authors:
Fred R. Stonesifer; Herschel L. Smith; NAVAL RESEARCH LAB WASHINGTON D C
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 | The study of 10Ni-8Co-2Cr-1Mo steel includes evaluations of tensile, impact, hardness, fracture toughness properties, and metallographic features. Base plate and three weldments in one-inch thicknesses are examined to compare as-welded properties with those obtained after reaging, and results of welding the 10%Ni alloy with 9-4-20 wire as opposed to a matching weld wire composition. Critical crack sizes are calculated for the material. The most desirable weld properties are obtained using ... |
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| FRACTURE TOUGHNESS OF FILAMENT-WOUND COMPOSITES. PART I. EFFECT OF MATERIAL VARIABLES. |
29 JUL 1970 |
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| Authors:
Robert J. Sanford; Fred R. Stonesifer; NAVAL RESEARCH LAB WASHINGTON D C
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| The application of the theory of linear fracture mehcanics to quasi-brittle, glass- reinforced-plastic composites is an important first step in understanding the basic mechanisms of failure of these materials. In this study, a simple test technique sensitive to small changes in the material based on fracture mechanics concepts. Six different resin-glass combinations were tested. The results of these tests indicate that (a) there is no difference in the fracture strenght ... |
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| FRACTURE PROPERTIES OF THE NEW DUAL STRENGTHENED 10% NICKEL STEEL IN TWO-INCH PLATE. |
JUL 1970 |
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| Authors:
Fred R. Stonesifer; Herschel L. Smith; NAVAL RESEARCH LAB WASHINGTON D C
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| The new dual strengthened 10%Ni alloy appears particularly well suited for construction of large pressure vessels. An attractive combination of strength, toughness, and resistance to corrosion; as reported by other investigators, is derived through a heat treatment which combines the advantages of conventional low-carbon martensite with those of the maraging mechanism. A two-inch thick plate of this new alloy was welded by the standard TIG process and evaluated in relation ... |
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| PROPERTIES OF HOT-PRESSED 10 Ni-Cr-Mo-Co STEEL. |
NOV 1969 |
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| Authors:
Fred R. Stonesifer; H. L. Smith; H. E. Romine; NAVAL RESEARCH LAB WASHINGTON D C
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| The properties reported for the dual-strengthened 10 Ni-Cr-Mo-Co steel plate have been encouraging. The high toughness, at relatively high yield strength, makes this material a prime candidate for pressure hull fabrication. Previous data have been for rolled plate only. This report presents limited data on the mechanical properties of hot-pressed 10 Ni-Cr-Mo-Co steel. (Author) |
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| FRACTURE DATA ON PROSPECTIVE ALLOYS FOR DEEP SUBMERGENCE AND SPACE APPLICATIONS. |
NOV 1968 |
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| Authors:
Fred R. Stonesifer; Herschel L. Smith; NAVAL RESEARCH LAB WASHINGTON D C
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| Explorations into the ocean and space demand structural materials of higher fracture toughness and strength-to-weight ratio. Nickel-steels and titanium alloys appear promising for such applications. This report presents fracture toughness data obtained through nearly 600 tests performed on specimens from 134 plates of materials in these two classes. (Author) |
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| DSSP PROGRAM ON HIGH-STRENGTH MATERIALS (EVALUATION OF AN EXPERIMENTAL TITANIUM-FREE MARAGING STEEL). |
APR 1968 |
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| Authors:
Fred R. Stonesifer; Herschel L. Smith; Hugh E. Romine; NAVAL RESEARCH LAB WASHINGTON D C
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| The report begins with a short explanation of why a large titanium content was thought to be a detrimental to toughness of maraging steels. Several metallurgists have identified the fracture nucleating particles in maraging steels as titanium nitrides and titanium carbides. An experimental 'titanium-free' maraging alloy was developed. Two heats were tested; one was of laboratory quality, and one of a quality as might be expected from production heats. Both ... |
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