The precise calculation of J integration is fundamental to safety assessment of structure containing defects.
J积分的精确计算是含缺陷结构安全评定的基础。
And points out simultaneously it is convenient, reasonable and economic for the pipe product to be tested for its fracture toughness of J integration with small samples.
指出对这样的管材做小试样的J积分试验来测试其断裂韧性既方便、合理，又经济。
For surface crack in pipe, this paper presents the finite element model including line spring element that is used for J integration calculation, as well as numerical examples.
对管道上的表面裂纹采用线弹簧单元，建立了裂纹管道J积分计算的有限元模型，给出了J积分的计算实例。
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