Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate
2007-08-03
2008-11-11
Thompson, Jewel V (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
C073S856000
Reexamination Certificate
active
07448280
ABSTRACT:
Method for evaluating the fatigue strength of welded joints produced by melting an alloy using a specified welding technique, which method comprises the following steps:a statistically significant number N of specimens are produced with a welded joint using said welding technique;each of the specimens is subjected to cyclic fatigue tests, with an alternating stress a, until failure;the size of the relevant defect appearing in the fracture plane of the specimens is measured by fractography;a range of defect dimensions for which the probability of measuring by fractography a defect outside the range is less than a predetermined level of probability t is determined from the measured sizes; andthe lowest stress σminliable to cause the specimen to fail with a level of probability t is determined from this range.
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W.R. Oates, et al., “Welding Metallurgy of Titanium and Titanium Alloys,” Titanium and Titanium Alloys, Welding Handbook - vol. 4 - Materials and applications, part 2, 1998, American Welding Society, XP002425725, pp. 500-506 and 514-519.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
SNECMA
Thompson Jewel V
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