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

关键词:  焊接接头  裂纹  积分

Key words:  Welded joint  Cracking  Integral

摘要:

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。

Abstract:

Proposing a counter example,it is proved that J integral is not conservative in regional heterogeneous media.Noticing the discontinuity of stress and strain components somewhere,J^* integral is presented to modify J^* integral.The pathindependence and the physical meaning of the J^* integral,and the energy expression J^*=-1∂U/B∂a are verified simply.The concept and the constitution approach of interface elements are put forward for regional heterogeneous media in elastoplastic FEM analysis.