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自由装填药柱的结构完整性分析 总被引:4,自引:3,他引:4
研究了适用于自由装填药柱应力分析的有限元方法,并对某型号导弹的固体发动机药柱进行了应力分析及结构完整性分析。 相似文献
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J.L. Rand D. Wakefield 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2010
In order to provide scientists with a stratospheric platform from which to conduct long duration research, a superpressure balloon is desired which will maintain a relatively constant volume for weeks at a time. The pumpkin shaped balloon has been developed by making use of the surface lobing to limit the circumferential stress and meridional tendons to carry the loads in the other direction. However, in order to prevent geometric instabilities during deployment and after pressurization, the design should eliminate as much excess material as possible while not exceeding the permissible stresses of the material. This paper will describe the behavior of the very thin membrane material selected for this application and the limits of the film in a biaxial state of stress. In addition, it is shown that the viscoelastic nature of the film will limit the stress by causing a reduced radius of curvature in the lobe of the pumpkin. 相似文献
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用应力降落法测定单向PAN基碳纤维T300增加热碳基复合材料在1900-2350℃蠕变内应力σ0,结果及分析表明,对单向C/C复合材料,σ0不是一个材料常数,而是温度T、初始力σs及结构因子S的函数,即σ0=σ0(t,σs,S)。 相似文献
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粘塑性材料结构的有限元分析方法 总被引:6,自引:3,他引:3
本文针对Walker粘塑性本构方程,通过发展一自适应变步长积分算法,用户子程序的方法把该本构方程结合进了国际著名的非线性有限元软件ABAQUS,并进行了算例验证。它包括了四种单元类型,可考虑材料变形的率相关,加载的循环、非等温、变温等情况。适用于发动机热端部件非线性结构分析。 相似文献
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