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采用动态有限元与动态Ｊ（ｔ）积分相结合的数值方法，首次计算了岩石四弯裂纹试件的动应力强度因子ＫＩ（ｔ）与ＫＩ（ｔ），获得了各种复合比下ＫＩ（ｔ）／Ｋ０，ＫＩ（ｔ）／Ｋ０－ｔ的关系曲线。结果表明，本文方法具有较好的效果。
The dynamic stress intensity factors KI (t) and KI (t) of four-crack specimens were calculated for the first time by using the dynamic finite element method combined with dynamic J (t) integral. The KI t) / K0, KI (t) / K0-t. The results show that this method has good effect.