摘要
对低碳钢材料带孔薄壁圆管试样采用逐级加载试验方法,得出其在室温下的单轴循环应力-应变本构关系。利用有限单元法对圆管试样进行弹塑性分析,采用Von Mises屈服准则、多线性随动强化模型,并结合试验获得的本构关系来定义材料的弹塑性特性。拉扭应变载荷加载在柱坐标下进行,采用一端固定,另一端加轴向位移与周向位移的方式。分别在纯拉、纯扭以及拉-扭比例加载下计算出应力应变场,获得不同受力情况下不同孔径尺寸试样在缺口处的应力应变分布。计算结果为多轴加载疲劳试验和复杂应力状态下工程零部件的疲劳寿命预测与分析提供基本数据。
Stepwise loading method is carried out on a sort of low earbon steel material＇ s thin-walled tube specimens with hole. The material＇ s stress-strain constitutive relation of uniaxial eyelie is obtained. Adopting the finite element method and applying the elastic-plastic analysis of the tubular specimens, elasto-plastie material property is described by the Von Mises yield criterion. The muhilinear kinematic hardening rules and the constitutive relation are got by the experiment. Tension-torsion loading is carried out by applying the axial and circular displacement on one end of tbe speeimen in the cylindrical coordinate system. The stress-strain responses under tension, torsion and proportional loading are ealculated, and then the stress-strain law around the notch of the specimens with different diameter size of the hole is obtained. The result will help providing basic data for the multi-axial loading fatigue test and fatigue life prediction under complex stress state.
出处
《实验室研究与探索》
CAS
北大核心
2013年第12期54-56,60,共4页
Research and Exploration In Laboratory
关键词
本构关系
带孔薄壁管
有限元法
多轴加载
constitutive relation
thin-walled tube with hole
finite element method
multi-axial loading
