含裂纹金属梯度材料的剩余强度研究

摘要

开展了含裂纹金属梯度材料剩余强度的试验和数值模拟研究，完成了含缺口 TC4-TC11金属梯度材料的三点弯试验，基于梯度扩展有限元方法，建立了I型裂纹金属梯度材料的剩余强度分析模型，结合交互式能量积分方法计算应力强度因子，引入K判据，建立了含I型裂纹金属梯度材料的剩余强度分析方法。并将模型的计算结果和试验结果进行对比，验证了该方法的有效性。基于该有限元方法详细讨论了材料参数对其剩余强度的影响规律，并得到了一些有用的结论。%In this paper, the residual strength of metal gradient materials with I cracks is observed through the test and the numerical simulation. A three-point bending test of TC4-TC11 metal gradient material with notches is completed. The model of the residual strength is built to have a research on metal gradient material with cracks, based on the extended finite element method. The stress intensity factor is calculated by the use of the extended finite element method of interactive energy integral. Comparing the experi-mental results with the calculated results, the model is verified to be valid. The influence of the material parameters on the residual strength is discussed, based on the finite element model to get some useful conclusions.