QUICK EVALUATION METHOD OF ELASTICITY, PLASTICITY, AND CREEP CHARACTERISTIC

摘要

PROBLEM TO BE SOLVED: To provide a quick evaluation method of elasticity, plasticity, and a creep characteristic capable of executing evaluation of elasticity, plasticity, and creep characteristic wherein several kinds of tensile tests under strain rate and several kinds of creep test under retention stress are required to be executable hitherto, only by one kind of a step wave load test that comprises an instantaneous load part and a strain retention part.;SOLUTION: The step wave load test wherein an instantaneous load and strain retention are repeated is executed, and a stress-elastic/plastic strain curve is acquired from a stress-strain curve, corresponding to the instantaneous load part; and a material constant relative to an elastic/plastic characteristic is derived from the stress-elastic/plastic strain curve, and a relation between the stress and the creep strain rate is acquired from a stress mitigation curve. Then, the ratio between transient creep strain rate and steady creep strain rate is acquired from a repeated stress mitigation curve, and the material constants of a steady creep rule and a transient creep rule are derived, from the relation between the stress and the creep strain rate or the ratio between the transient creep strain rate and the steady creep strain rate.;COPYRIGHT: (C)2008,JPO&INPIT