三维裂纹应力强度因子的有限元计算分析

Analysis of Emulational Limited Element Method for the Three-dimensional Stress Intensity Factors

在大型有限元工程软件ANSYS中,对于裂纹应力强度因子的二维计算已经有了比较完善的方法[1]。但在对三维裂纹的应力强度因子求解问题上目前所采用的方法主要是靠人工手动地生成节点,然后再生成单元和结构。这种方法工作量大,不利于结构程序化,特别是对复杂结构更为难以实现。本文利用三维实体建立计算模型,对模型进行独特的局部网格划分,以孔边角裂纹为例阐述了在ANSYS中,三维裂纹应力强度因子计算分析的简捷方法。并将计算结果和现有理论结果进行对比分析,其计算精确程度完全满足工程要求[2]。

There are much more methods about the calculation of the stress intensity factors for the two - dimensional crack in an engineering software ANSYS. For the question of the calculation of the stress intensity factors for the three - dimensional, traditional methods of generation nodes mainly rely on our hands, then generate elements and structures. The methods have the disadvantages, e.g. with much workloads, the structure programming which makes against and the complex structures which are more difficult to realize. This paper uses two - dimensional substantiality to create a calculation model, and uses a special method to plot gridding to a local model, It gives an example of the comer cracks on the hole＇s edge to expatiate the simple method of the calculation of the stress intensity factors for the three - dimensional. It is found that the precision is enough for the need of the engineering after the comparation between the results of the paper and the existing results.