Cyclic Stress-strain Hardening Model of AC4C-T6 Alloy at Cryogenic Temperature

Abstract Present study is concerned with the simulation of plasticity models for the cyclic stress-strain behavior of aluminum alloy AC4C-T6 that can be used for primary materials of LNG cargo pump. Material model of cyclic hardening and plasticity f or aluminum alloy AC4C-T6 was investigated through experiments and numerical simulations. Monotonic tensile and cyclic tension-compression test under symmetric load cycles was performed at both room temperature and cryogenic temperature of -165 o C. Based on the experimental data plastic hardening models were evaluated for isotropic/kinematic/combined hardening. FEA (Finite Element Analysis) models which describe the cyclic stress-strai n relationship were evaluated for the simulation of plasticity. An appropriate hardening model is proposed comparing the results of FEA with those of experiments. ※Keywords: LNG cargo pump(액화천연가스 펌프), Cyclic hardening(반복 경화), AC4C-T6, FEA(유한요소해석), Cyclic stress-strain(반복 응력-변형률) 1. 서론 접수일: 2009년 2월 15일, 승인일: 2009년6월 18일 g교신저자: jh_lee@inha.ac.kr, 032-860-7345