摘要
基于ANSYS有限元软件通过相互作用积分法建立了求解三维穿透裂纹应力强度因子的有限元模型,将有限元法和解析法求得的应力强度因子进行比较验证了模型的准确性。研究了载荷、裂纹长度、试样宽度、厚度对裂纹尖端应力强度因子的影响,在对比结果的基础上分析了裂纹尖端应力强度因子的三维效应。结果表明:在不同条件下有限元模型都可以很好的模拟出应力强度因子的值,二维状态时应力强度因子的分布规律与三维状态时的分布规律有较大差异,出于安全的考虑不应忽略应力强度因子的三维效应,对三维应力强度因子的有限元求解有一定的指导意义。
Based on ANSYS software, the calculation model of stress intensity factors （SIF）was built utilizing the interaction integral method to predict the SIF for 3D straight through cracks. The theoretical calculation results are used to compare with the results calculated by using the FEM method. The results of the comparison testify the accuracy of the model. The influences of load, crack length, width and thickness on cracktip stress intensity factor are studied. Based on the comparison,the 3D effects of the crack tip stress factors are analyzed. According to the results, the calculation model of SIF can simulate the value of SIF accurately in different situations. There are huge differences between the 2D and the 3D on the distribution of SIF. The method is conductive for calculating crack-tip stress intensity factor.
出处
《沈阳航空航天大学学报》
2014年第3期19-23,共5页
Journal of Shenyang Aerospace University
