Determination of Strain Rates in Ship Hull Structures: A Feasibility Study.
Technical rept. 15 Sep 81-10 Sep 82,
PITTSBURGH UNIV PA INST FOR COMPUTATIONAL MATHEMATICS AND APPLICATIONS
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The material testing techniques that are currently used to determine the toughness of the ship structural steels load material specimens at various loading and strain rates. Since the toughness, nilductility and the yield strength characteristics of ship structural steels varies with strain rate, it has become necessary to determine the extent to which the strain rates produced by materials testing techniques are representative of ship service experience. A survey of existing shipboard stressstrain data is presented and the data bases are evaluated to determine the feasibility of obtaining strain rates. The results of the survey indicate that it is feasible to determine strain rates from existing ship data however, the stressstrain data require additional data reduction and analysis before detailed strain rates may be obtained. Preliminary calculations of strain rates that are comparable to the order of magnitude of strain rates given for current material toughness tests were obtained from existing data. Two methods are outlined to obtain ship structural strain rates from analytical predictions or in conjunction with future full-scale instrumentation programs. Keywords Ship response instrumentation.
- Metallurgy and Metallography