A path independent of the J-integral and the stress, strain on the crack tip are discussed.
讨论了J积分的路径无关性和裂尖应力，应变奇异性。
High strain rate will occur at the tip of a growing crack, whether quasi-static or dynamic growth, due to the existence of strain singularity.
在扩展裂纹尖端，无论是准静态扩展还是动态扩展，由于应变奇异性的存在，出现较高的应变速率。
The load-strain relationship at crack tip is obtained through electric strain gauge measurement.
用电测法得到了裂尖处的载荷—应变标定关系。
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