Abstract
Direct measurement of uniaxial true stress-strain behavior for ductile engineering materials is not possible when necking occurs in standard tensile test specimens. A procedure is presented which converts standard specimen test data to a true stress-strain relation postulated as valid for higher strains. A series of finite element test specimen simulations demonstrates the correction algorithm rationale for HY-100 steel. Predicted specimen behavior was in close agreement with reported experimental data. The combined influence of specimen boundary conditions and material stress-strain behavior is discussed. Results suggest that specimen behavior may be modeled correctly without the use of auxiliary conditions, such as geometric imperfections or material instability, to trigger specimen necking.
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