含裂纹管道结构的三维应力强度因子数值仿真

Numerical Simulation of Three-Dimensional Stress Intensity Factor of Cracked Pipe Structure

含裂纹管道结构的应力强度因子对结构的安全评估至关重要,对于非穿透型裂纹来说,很难得到其理论解,必须采用数值仿真得到近似解。本文基于ANSYS软件给出了管道结构三维应力强度因子的数值建模方法,并利用含穿透型裂纹直管结构验证了本文方法的精度和可行性。进一步针对含非穿透型裂纹的弯管结构的三维应力强度因子进行了参数影响研究,分析了轴向及环向裂纹深度和长度对裂尖应力强度因子的影响规律。本文所建立的三维应力强度因子数值仿真方法可推广用于其它工程结构应力强度因子的计算评估。

The stress intensity factor is very important to the safety evaluation of cracked pipe structures, and it is very hard to obtain the theoretical solution for part-through cracks, so numerical simulation is always employed to obtain the approximate solution. The present paper shows the numerical modeling approach for the three-dimensional stress intensity factor of pipe structure with ANSYS software, and the cracked straight pipe is employed to verify the accuracy and feasibility of the proposed approach. The influence of parameters on the three-dimensional stress intensity factor of elbow pipe structure with a part-through crack was investigated. The influence of depth and length of axial and radial part-through cracks on stress intensity factor was analyzed. The numerical simulation approach of the three-dimensional stress intensity factor proposed in this paper could be used for calculating and evaluating the stress intensity factor of other engineering structures.