10Ni5CrMoV钢循环塑性变形的力学本构关系

详细信息

Mechanical Constitutive Relation under Cyclic Loading of 10Ni5CrMoV Steel

1. Luoyang Ship Material Research Institute, Luoyang 471023, China;
2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

摘要: 针对屈服强度为785 MPa级别的调质态10Ni5CrMoV钢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的对数呈良好的线性关系。基于上述结果提出了描述循环应力应变关系的单对数强化弹塑性本构关系模型σ=σ_p+χ·lgε_p,并建立了10Ni5CrMoV钢循环应力应变本构方程。
- 10Ni5CrMoV钢 /
- 循环应力应变 /
- 本构关系
Abstract: Cyclic loading tests with variable strain amplitudes were conducted on 10Ni5 Cr Mo V steel with nominal yield strength of 785 MPa and cyclic stress-strain behavior was analyzed.Resultsindicate 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. A single logarithm constitutive model for cyclic deformation σ=σ_p+χ·lgε_p was proposed based on above results and the parameters of this model for 10Ni5 Cr Mo V steel were determined.
- 10Ni5CrMoV steel /
- cyclic stress-strain /
- constitutive model