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方舱结构是一类典型的电子设备结构。为提高方舱荷重比,大板式方舱正得到迅速发展和广泛应用。由于大板式方舱采用聚胺脂泡沫塑料作为蒙皮间充填材料,而蒙皮有些则采用了纤维增强复合材料,因此给大板式方舱大型组合结构的分析带来了困难,即使采用SAP5、SAP6这样的大型组合结构静动力分析程序也由于单元库中无相应单元而无法进行分析或不得不作很大的近似。本文按照复合材料力学理论,构成了一种可用于电子设备大板式方舱结构分析的各向异性层合板单元。这种单元对材料层数没有限制,各层材料可以是各向异性、正交各向异性和各向同性材料。计算结果可得结点位移和各层中的应力分布。基于SAP6程序强大的组合结构静动力分析功能和目前国内该程序装机使用的普遍性,本文将前述单元扩充到SAP6程序单元库中,目前已在VAX——780机调试成功,据实例计算,效果良好,从而使扩充后的SAP6程序能够适应大板式方舱的分析,也可用于分析具有类似层合板的其它结构。
The cabin structure is a typical class of electronic equipment. In order to improve the cabin load ratio, large slab square cabin is being rapidly developed and widely used. Because of the use of polyurethane foams in the large-decked shelters as the skin-fill material and the skin-in-some of the fiber-reinforced composites, the analysis of large composite structures in large-panel shelters has caused difficulties, even with SAP5, Large-scale composite structures such as the SAP6 static-dynamic analysis program can not be analyzed or have to be approximated largely by the absence of corresponding elements in the cell library. According to the theory of composite mechanics, this paper constitutes an anisotropic laminate unit which can be used for the analysis of large slab-type square structures of electronic equipment. This unit has no limitation on the number of layers of material, which may be anisotropic, orthotropic and isotropic. Calculations result in node displacements and stress distribution in each layer. Based on the powerful combined structure static and dynamic analysis function of SAP6 program and the universality of the program installed and used in our country at present, this paper expands the above units into the SAP6 program unit library. At present, the VAX - 780 machine has been successfully debugged. According to the example calculation and the effect So that the expanded SAP6 program can accommodate the analysis of large slab shelters as well as analyze other structures with similar laminates.