【摘要】 管道兼有壳体和梁构件的特征 ,可以利用三维守恒律及梁的弯曲理论计算它的应力强度因子。利用裂纹张开能量释放率 ,即G 积分的概念 ,通过特定的积分路径 ,给出了两种对称弯曲下双边裂纹管道的应力强度因子表达式。对于非对称弯曲情况 ,将裂纹截面处的弯矩进行分解 ,进而根据叠加原理 ,给出了非对称弯曲双边裂纹管道的应力强度因子表达式。在此基础上 ,导出了与最大应力强度因子所在裂纹相邻裂尖是否产生应力集中的一个判别式 ,并给出了相应的说明曲线。利用它可以方便地判断非对称弯曲下该裂尖是否有可能引起破坏 ,在工程应用上具有参考意义。更多还原

【Abstract】 Stress intensity factors of pipes can be estimated by three-dimensional conservation law and because pipes have characters of both shells and beams. In this paper, based on G* integral, specified integral path and bending theory, stress intensity factors for two kinds of circumferential double edge-like cracks in pipes under symmetric bending is proposed. For pipes under non-symmetric bending moment, bending moment on crack cross-section can be resolved, which result is same to two cases above. By superposition method, stress intensity factors for circumferential double edge-like cracks in pipes under non-symmetric bending moment are given. A discriminant for judging whether stress concentration occurs or not is derived. Dangerous areas can be distinguished by the formula and picture of it. Its significance is for the reference of engineering application.更多还原