用子结构方法自动计算飞机舱体实验模型裂缝的应力强度因子

基于ANSYS编制的自动分析软件，用子结构方法自动建立实验模型的有限元分析模型，完成子结构间的无缝连接，通过计算由2个子结构组成的模型并扩展包含裂缝的子结构的解得到应力强度因子。应用算例计算结果表明，子结构方法与整体模型方法的计算结果相同，而子结构方法占用机时少约40％；计算结果与实验结果十分接近。

Automatic calculation of crack intensity factor of aircraft fuselage test model by sub-structure method

The sub-structure method was used to simulate an aircraft cargo test model and calculate its stress intensity factor (SIF) of cracks in the cargo fuselage. Software for automatic analysis based on ANSYS was developed, which could create a sub-structure of FEM model for the test model and complete the connection of two sub-structures. The SIF was computed from the expanded solution of a sub-structure with crack and a model with 2 substructures. The comparison of the results from the sub-structure method and the whole model method showed that the two calculated results are the similar and close to the experimental results, however, the substructure method takes much less time than that of the other.