0Cr18Ni24Mo6N奥氏体焊缝金属循环塑性变形的力学本构关系

Mechanical Constitutive Relation under Cyclic Loading of 0Cr18Ni24Mo6N Weld Metal

针对0Cr18Ni24Mo6N奥氏体焊缝金属开展了系列应变幅的循环加载试验,并分析了循环应力应变特性。结果表明:循环塑性变形条件下表观弹性模量随应变幅的增大呈线性降低特点;循环塑性应变显著降低屈服强度,且屈服强度随应变幅的增大呈线性降低特点;塑性变形段的真应力和真应变塑性分量满足单对数强化弹塑性本构关系,并建立了0Cr18Ni24Mo6N奥氏体焊缝金属循环应力应变本构方程。

Cyclic loading tests with variable strain amplitudes were conducted on 0Cr18Ni24Mo6 N weld metal and cyclic stressstrain behavior was analyzed. The results indicated that elastic modulus and yield stress both decreases linearly with increasing strain amplitude. Linear relationship was found between true stress and true strain logarithm in plastic deformation region. True stress and true strain met the single logarithm constitutive model in cyclic plastic deformation region and the parameters of this model for 0Cr18Ni24Mo6 N weld metal were determined.