The equipment,such as toiler,pressure vessel and pipeline,subjected to cyclical load suffer failure as a result of the low cycle fatigue (LCF).In this paper,based on the continuum damage mechanics(CDM)theory,the LCF d...The equipment,such as toiler,pressure vessel and pipeline,subjected to cyclical load suffer failure as a result of the low cycle fatigue (LCF).In this paper,based on the continuum damage mechanics(CDM)theory,the LCF damage variable is measured through stress amplitude method during the strain controlled tests,and a continuum damage model of isotropic LCF is derived.The material tested is a 10CrMo910 steel.The LCF damage evolution equation and life estimate have been derived by use of the effective stress concept and the hypothesis of strain equivalence.展开更多
在已有三维机织圆管复合材料几何模型的基础上采用三维实体有限元方法,建立细观单胞模型模拟三维机织圆管复合材料在轴向拉伸情况下损伤的起始、扩展、直至最终破坏的全过程。采用改进的树脂传递模塑(Resin transfer moldling,RTM)工艺...在已有三维机织圆管复合材料几何模型的基础上采用三维实体有限元方法,建立细观单胞模型模拟三维机织圆管复合材料在轴向拉伸情况下损伤的起始、扩展、直至最终破坏的全过程。采用改进的树脂传递模塑(Resin transfer moldling,RTM)工艺制作了拉伸试件并进行了相应的试验。计算结果和试验结果吻合良好,均是纬向纱线横向首先产生破坏,并且应力-应变曲线都表现出显著的非线性特征,证明了研究方法的正确性。展开更多
文摘The equipment,such as toiler,pressure vessel and pipeline,subjected to cyclical load suffer failure as a result of the low cycle fatigue (LCF).In this paper,based on the continuum damage mechanics(CDM)theory,the LCF damage variable is measured through stress amplitude method during the strain controlled tests,and a continuum damage model of isotropic LCF is derived.The material tested is a 10CrMo910 steel.The LCF damage evolution equation and life estimate have been derived by use of the effective stress concept and the hypothesis of strain equivalence.
文摘在已有三维机织圆管复合材料几何模型的基础上采用三维实体有限元方法,建立细观单胞模型模拟三维机织圆管复合材料在轴向拉伸情况下损伤的起始、扩展、直至最终破坏的全过程。采用改进的树脂传递模塑(Resin transfer moldling,RTM)工艺制作了拉伸试件并进行了相应的试验。计算结果和试验结果吻合良好,均是纬向纱线横向首先产生破坏,并且应力-应变曲线都表现出显著的非线性特征,证明了研究方法的正确性。
