多轴加载下缺口件弹塑性有限元分析及疲劳寿命预测  

Elasto-plastic finite element analysis and prediction of fatigue life-span on notched specimens under multi-axial load

作　　者：刘灵灵[1] 李皓玉[1] 齐月芹[1] 

机构地区：[1]石家庄铁道学院工程力学系,河北石家庄050043

出　　处：《机械设计》2010年第2期17-20,共4页Journal of Machine Design

摘　　要：利用有限元分析软件ANSYS,得到了承受拉扭循环载荷的缺口试件缺口的处精确应变数值,给出了引起疲劳破坏的危险点。在临界平面法的基础上,考虑到法向正应变对疲劳寿命的影响,建立了一个新的多轴疲劳寿命预测模型,该模型可以较好地预测缺口试件的疲劳寿命。By the use of finite element analytical software ANSYS the precise strain numerical value at the notch of notched specimen that bears tensional and torsional cyclic loading was obtained, and the dangerous points that led to fatigue damage were given out. On the basis of critical plane algorithm, by considering the influence of positive normal strain on the fatigue life-span, a new model for the multi-axial fatigue life-span prediction was established. This model could preferably predict the fatigue life-span of notched specimens.

关 键 词：多轴加载 缺口试件 弹塑性有限元 临界平面 疲劳寿命预测 

分 类 号：O346.2[理学—固体力学]