形状改变比能的J^＊积分及应用

J~* INTEGRAL OF THE DEVIATOR STRAIN ENERGY PER UNIT VOLUME AND ITS APPLICATION

本文引进形状改变比能的概念，对平面裂纹起裂扩展问题进行了讨论，给出一个与路径无关的J*积分，通过I型裂纹的应用，其结果与现行公开发表的文献或手册结果一致。

J* integral of the deviator strain energy per unit volume is introduced in this paper. The problem of plane-crack critical growth is discussed and a path-independent line integral J* is given. Mode I stress intensity factors of cracked beams are obtained using the approach. The results are shown to agree well with those available in the open literature.