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采用有限元和动态Ｊ积分相结合的方法，首次较精确地计算了四点弯曲试件的ＫⅠ（ｔ），ＫⅡ（ｔ）的值，获得了各种复合比时ＫⅠ（ｔ），ＫⅡ（ｔ）的关系曲线，并提出了一种确定ＫⅠｄ和ＫⅡｄ的方法，对提出的算法程序进行了验证．
The KⅠ (t) and KⅡ (t) values of the four-point bending specimen were calculated for the first time by using a combination of finite element and dynamic J-integral. The KⅠ (t), KⅡ t) and presents a method to determine KId and KIId, and validates the proposed algorithm.