裂纹管道失效评定中的有限元方法

J积分的精确计算是含缺陷结构安全评定的基础。对管道上的表面裂纹采用线弹簧单元，建立了黎明纹管道J积分计算的有限元模型，给出了J积分的计算实例，其于J积分理论，利用这种有限元模型得到了裂纹管道的精确换效评定曲线，根据计算结果，讨论了影响失效评定曲线的各种因素。分析表明，裂纹尺寸和管材材料性能参数等都对失效评定曲线产生影响，用单一的失效评定曲线进行评定会出现精度较差的问题，因此，采用提出的有限单元方法对裂纹管道的失效进行精确评定具有重要意义。

Finite Element Method of Failure Assessment of Cracked Pipe

The precise calculation of J integration is fundamental to safety assessment of structure containing de-fects. 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. With the model in this paper the precise failure assessment curves can be generated based on J integration theory. Numerical results are pro-vided as to the analysis of the effects of the various kinds factors on the failure assessment curve. It is showed that a single failure assessment curve is not enough precise because such factors as crack size and material performance parameter have effects on failure assessment curves. Therefore, the finite element method presented in the article is particular valuable to the precision failure assessment of cracked pipe.