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Rate-dependent two-surface model for cyclic hardening behaviour of advanced high strength steel sheets
|저자명||Jeehyang HUh Hoon Huh Gi Hyun Bae|
Materials deform subjected to cycles of tension and compression during sheet metal form-ing processes. Under cyclic loading of tension and compression, materials show unique characteristics such as the Bauschinger effect, early re-yielding and permanent softening. To address these characteristics, many researchers have developed cyclic hardening mod-els. One of the reliable models is a two-surface model which is selected in this paper since it represents cyclic hardening behavior of TRIP590, an advanced high strength steel sheet, in a proper way. Tension‒compression tests were carried out for TRIP590 steel sheets by applying a cycle of tensile and compressive loads with the jig set developed by Bae (2011) at the range of strain rates from 0.001 s-1 to 1 s-1. Their cyclic hardening behaviors were then modeled with a modified two-surface model to consider the strain-rate effect. The rate-dependent two-surface model constructed can describe the rate-dependent cyclic hardening behaviour TRIP590 with great accuracy.