The concept and theory of j-integration are introduced and a complete set of measurement is theoretically set up.
介绍了J积分的概念及其理论，并选用该理论建立了一套较完整的测试方法。
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。
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。
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