CAJ | 학술논문

针对弹体结构应力集中问题对有限元子模型法进行研究，子模型法将有限元分析分成2次进行：第1次采用稀疏网格，获得子模型边界上各节点的位移；第2次将子模型边界以内网格划分细密，而将第1次计算所得的边界上各节点的位移作为边界条件，获得子模型边界以内（应力集中部位）较准确的应力计算结果。文章采用ANSYS子模型法对有应力集中的弹体舱（级间）段结构进行有限元分析，解决了常规有限元法网格密、计算量大，甚至无法计算的难题。
침대탄체결구응력집중문제대유한원자모형법진행연구，자모형법장유한원분석분성2차진행：제1차채용희소망격，획득자모형변계상각절점적위이；제2차장자모형변계이내망격화분세밀，이장제1차계산소득적변계상각절점적위이작위변계조건，획득자모형변계이내（응력집중부위）교준학적응력계산결과。문장채용ANSYS자모형법대유응력집중적탄체창（급간）단결구진행유한원분석，해결료상규유한원법망격밀、계산량대，심지무법계산적난제。
In order to obtain more accurate results of stress concentration, sub-model method was used to analyze a missile structure in this paper.The procedure of the sub-model method consists of two steps:Firstly,a coarse mesh model was used for the whole structure to calculate the displacements of the cut-boundary nodes;Secondly,a denser mesh was generated for the sub-struc-ture (i.e.the sub-model) and the displacements of the cut-boundary nodes obtained in step 1 were used to calculate the accurate re-sults of the stress concentration. ANSYS finite element software was used for the simulations and the application of the sub-model method significantly reduced the workload and increased the accuracy of the simulations.