论文部分内容阅读
通过对X100管线钢原始状态和预应变状态钢材取光滑拉伸试样(ST)和缺口拉伸试样(NT),并分别在纵向(L)和横向(T)加载,研究了各试样应力-应变、应力-直径缩减量等的变化情况。结果表明,高钢级管线钢表现出了塑性的各向异性、各向同性和随动强化等特性。此外,通过数值模拟和分析,对不同加载状态下的试样建立了可以表现各向异性塑性和延性的材料模型,并将各向异性塑性模型和随动强化模型融合到新的模型里,得到了三向应力与等效塑性应变在断裂起始点上的关系。
The samples of plain and prestressed steel of X100 pipeline steel were taken as smooth tensile test (TST) and notched tensile test (NT), and the specimens were loaded in the longitudinal direction (L) and transverse direction (T) Stress - strain, stress - diameter reduction and other changes. The results show that the high-grade steel pipe showed plastic anisotropy, isotropic and follow-up strengthening and other characteristics. In addition, by numerical simulation and analysis, a material model that can show the anisotropy plasticity and ductility was established for specimens under different loading conditions, and the anisotropic plasticity model and the follow-up hardening model were fused into the new model to obtain The relationship between three-direction stress and equivalent plastic strain at fracture initiation point.