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本文是用有限元素法解轴压加筋板局部稳定性问题的研究报告。它从失稳变形模态对称性分析入手,提出了局部单元的计算模型。对于失稳变形模态非对称结构,指出典型单元计算模型的局限性。从而肯定了局部单元在稳定性计算中普遍的实用意义。对于铆接结构,分析了筋条与蒙皮的连接及其简化假设,改进了铆接结构的计算模型,确保了计算结果的合理性。另外,讨论了简化计算模型的两项原则。在此基础上,对计算模型作进一步简化,从而节省了机器内存,提高了解题速度。最后给出了计算曲线及实验结果,并对力矩分配法作了分析。
This paper is a finite element method to solve the problem of local stability of axially compressed stiffened plate research report. It starts with the analysis of modal symmetry of instability deformation and proposes a calculation model of local elements. For the asymmetric structure of instability deformation mode, the limitation of the typical unit calculation model is pointed out. Thus affirming the common practical significance of local element in stability calculation. For the riveted structure, the connection between the ribs and the skin and its simplified assumptions are analyzed. The calculation model of the riveted structure is improved, which ensures the rationality of the calculation results. In addition, two principles for simplifying the computational model are discussed. On this basis, to further simplify the calculation model, thus saving machine memory and improve the speed of problem-solving. Finally, the calculation curves and experimental results are given, and the moment distribution method is analyzed.