单元类型对疲劳裂纹二维弹塑性有限元模型的影响  

The effects of element style on the 2D elastic-plastic finite element model of fatigue crack propagation

作　　者：陆夏美[1] 宋欣[2] 马云飞[3] 

机构地区：[1]哈尔滨理工大学工程力学系,黑龙江哈尔滨150080 [2]哈尔滨理工大学机械工程学院,黑龙江哈尔滨150080 [3]哈尔滨工业大学力学结构实验中心,黑龙江哈尔滨150001

出　　处：《黑龙江工程学院学报》2008年第1期16-20,共5页Journal of Heilongjiang Institute of Technology

基　　金：黑龙江省自然科学基金资助项目(ZJG04-05)

摘　　要：用弹塑性有限元方法,以较少的单元建立模拟循环载荷下高强铝合金疲劳裂纹扩展的二维模型,计算塑性区尺寸、裂尖应力场及位移场等裂尖参数的有限元结果,与断裂力学和弹塑性力学公式计算的理论值进行比较,利用ABAQUS软件,分析不同单元类型对裂尖参数的影响,确定不同条件下计算精度较高的单元类型。An elastic-plastic two dimensional finite element model of the fatigue crack growth in the strong aluminum alloy by few elements has been set up. The finite element calculated results of the crack tip parameters, such as plastic zone size, stress field around crack tip and displacement field behind crack tip, have been obtained. The obtained results have been used to correlate the results which are calculated by the formulas of fracture mechanics and elastic plastic mechanics. The effects of element style on these crack tip parameters have been analyzed by ABAQUS software, and the suitable element style with high computation precision under different situations has been described.

关 键 词：有限元 弹塑性 疲劳裂纹 单元类型 

分 类 号：O344.3[理学—固体力学]