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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.2: Computer Technology; 20050717-21; Denver,CO(US) >Optimum Design of Multi-layered Vessels
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Optimum Design of Multi-layered Vessels

机译：多层容器的优化设计

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摘要

Multi-layered pressure vessels are widely used in the field of high pressure technology. To enhance their load bearing capacity and life, different beneficial processes such as shrink-fit and autofrettage are usually employed. Shrink-fit process, increases load capacity but maximum interference is generally limited. Autofrettage, makes steep stress gradients moving away from bore but Bauschinger effect limits maximum feasible compression level. A combination of both, can conceivably give better stress distribution in layered vessels. The optimum design of a three-layer vessel for maximum life expectancy has been considered here, under the combined effects of autofrettage and shrink-fit. The numerical optimization procedure known as the Simplex search method is employed to get the optimum design. The layer thicknesses, shrink-fit pressures, and autofrettage percentages are treated as design variables. Under stress constraints, the operational sequences of the above processes, for assembly of the layered vessel have also been formulated so as to lead to best results. The fatigue life consideration is based on ASME code and standard for high pressure vessel technology defining the allowable final crack depth in multi-layered vessels. The proposed procedure is carried out on a number of examples. The results show that significant life enhancement can be achieved using the optimization procedure with proper combination of operations.
机译：多层压力容器在高压技术领域中被广泛使用。为了提高它们的承载能力和寿命，通常采用不同的有益工艺，例如收缩配合和自动强化。收缩装配过程增加了负载能力，但通常会限制最大干扰。自增强使陡峭的应力梯度从孔中移开，但包辛格效应限制了最大可行压缩水平。可以想到的是，两者的结合可以在分层容器中提供更好的应力分布。在自动玻璃化和热压配合的共同作用下，这里考虑了三层容器的最佳设计以实现最大预期寿命。采用称为单纯形搜索法的数值优化程序来获得最佳设计。层厚度，收缩配合压力和自动玻璃百分率被视为设计变量。在压力限制下，还制定了上述过程的操作顺序，以组装分层容器，以达到最佳效果。疲劳寿命的考虑基于ASME规范和高压容器技术标准，该技术定义了多层容器中允许的最终裂纹深度。所提出的过程在许多实例上进行。结果表明，使用适当的操作组合优化程序可以显着提高使用寿命。

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