VISCO-PLASTIC DEFORMATION SIMULATION FOR DIRECTIONALLY SOLIDIFIED SUPER ALLOY DZ125
According to a group of mechanical behavior experiments,it is found that DZ125 material has complex deformation characteristics on various load conditions. The experiments were done at room temperature, and the temperature of 760 ℃,850 ℃,980 ℃. The items of the tests are ratedependent tension, cyclic harder/soften, cyclic relaxation of mean stress, and creep under constant stress. It is found that mechanical behavior of DZ125 depend on test temperature,orientation of samples, strain rate, strain amplitude, strain ratio,stress amplitude, etc. To simulate mechanics characteristic of directionally solidified super alloy, M(6×6) matrix is added in traditional Chaboche constitutive. To describe the third stage creep, a new creep formula is added in. Using the modified anisotropic Chaboche unified visco-plastic constitutive models the mechanics character of DZ125 by coding the users material subroutine (UMAT) in ABAQUS platform. The numerical simulations show that the modified Chaboche constitutive has sufficient capability of modeling DZ125 various mechanical behavior under complex loading conditions.
DZ125 directionally solidified super alloy Chaboche visco-plasticity constitutive ABAQUS cyclic relaxation of mean stress cyclic harder/soften creep
Zhou Tianpeng Yang Xiaoguang Shi Duoqi Yu Huichen
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics Beijing 100083, China
国际会议
昆明
英文
204-209
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）