CAJ | 학술논문

针对二维裂纹稳态扩展，基于位移外推，通过最小二乘法拟合得到应力强度因子数值计算方法；利用最大周向应力准则判断裂纹扩展方向，并得到作为裂纹失稳扩展判据的等效应力强度因子；通过Paris准则得到疲劳寿命预测数值方法。基于ANSYS软件平台，根据上述理论通过APDL编程建立了裂纹扩展路径模拟及疲劳寿命预测模型。该模型可根据裂尖位置进行参数化建模及网格自动划分。将3个典型算例仿真结果与相应解析解或实验结果进行比较，验证了该方法的正确性，为裂纹扩展路径模拟及疲劳寿命预测提供了一种有效的技术手段。
침대이유렬문은태확전，기우위이외추，통과최소이승법의합득도응력강도인자수치계산방법；이용최대주향응력준칙판단렬문확전방향，병득도작위렬문실은확전판거적등효응력강도인자；통과Paris준칙득도피로수명예측수치방법。기우ANSYS연건평태，근거상술이론통과APDL편정건립료렬문확전로경모의급피로수명예측모형。해모형가근거렬첨위치진행삼수화건모급망격자동화분。장3개전형산례방진결과여상응해석해혹실험결과진행비교，험증료해방법적정학성，위렬문확전로경모의급피로수명예측제공료일충유효적기술수단。
For analyzing the stable crack propagation in 2D solids, the displacement extrapolation technique associ?ated with the least square method is applied to calculate the stress intensity factors. The crack propagation angle and the equivalent stress intensity factors aimed to judge the crack instability propagation are calculated using the maxi?mum circumferential stress criterion. A numerical fatigue life prediction method is then proposed adopting the Paris criterion. Numerical modeling of the crack propagation path and fatigue life prediction is formulated using APDL programming based on the platform of ANSYS. Cracked bodies are parametrically modeled and automatically mesh?ed according to the coordinates of the crack tip. The numerical results of three typical samples agree well with the analytical or experimental results, verifying the accuracy of the proposed algorithms. It provides an effective way to predict the crack growth trajectory and the fatigue life of components.