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RATE-DEPENDENT HARDENING BEHAVIORS OF ULTRA-HIGH STRENGTH STEEL SHEETS UNDER IN-PLANE TENSION/COMPRESSION
|저자명||Hoon Huh, Geunsu Joo|
|Place||Puerto Vallarta, Mexico|
This paper is concerned with rate-dependent hardening behaviors of ultra-high strength steel sheets under in-plane tension/compression. In order to perform tension/compression tests of ultra-high strength steel sheets at intermediate strain rates, novel devices are designed to impose a designated tensile or compressive strain with a servo-hydraulic testing machine. Rate-dependent tension/compression hardening curves of TRIP980 and TWIP980 steel sheets are acquired at a quasi-static and intermediate strain rates ranging from 0.001 to 100 s−1. From the rate-dependent hardening curves in subsequent compression, the decrease of the Bauschinger effect are observed with the increase of the strain rate. For the TWIP980 steel sheet, the permanent softening is observed and its magnitude increases as the strain rate increases.