单边双裂纹模型及其J积分的守恒性

Single-Edge Double-Crack Model and Conservation of J Integrate

针对某些工程结构特点,设计了单边双裂纹模型。然后先从理论上证明了其结构J积分的守恒性,再以焊接接头为例,通过体现焊接接头的几个特征参数,从力学和几何不均匀性两方面给予有限元方法数值实验证明,从而为工程结构中类似的缺陷评定奠定基础。

With an aim at some engineering structure features, a single-edge double-crack model is designed. And then, the conservation of its structure J integrate is proved in theory. Taking the welded joint for an example, several typical feature parameters indicating the welded joint are proved by numeral tests of the finite element method from two aspects of mechanical and geometrical un-uniformity, whereby laying a solid base for the defect assessment of similar engineering structure.