关于焊接接头分区不均匀裂纹体的J积分

ON THE J INTEGRAL FOR REGIONAL HETEROGENEOUS WELDED JOINTS WITH CRACKS

用反例证明了分区不均匀介质中J 积分的不守恒性。注意到应力应变分量的间断性,提出了J~*积分以修正J 积分。进而说明了J~*积分的守恒性、物理意义及其能量率表达式的适用性。对用有限元分析分区不均匀介质时,提出了界面单元的概念和构造方法。

Proposing a counter example,it is proved that J integral is not conservativein regional heterogeneous media.Noticing the discontinuity of stress and straincomponents somewhere,J integral is presented to modify J integral.The path-independence and the physical meaning of the J integral,and the energy expressionJ=-(1(?)U/B(?)a)are verified simply.The concept and the constitution approach ofinterface elements are put forward for regional heterogeneous media in elasto-plastic FEM analysis.