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Multi-objective optimisation of autofrettaged functionally graded thick spheres

机译:自动分装功能梯度厚球的多目标优化

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In this work, optimum configuration of autofrettaged FGM spherical pressure vessel is investigated. The objective functions of the optimisation problem are taken to be the pressure capacity of the FG vessel and its weight. The properties of FG vessel are taken to be radially varying. The residual stress after autofrettage is calculated in the absence of Bauschinger effect using variable material property (VMP) method. Assuming bilinear elastic-plastic behaviour for the metal and perfect elastic behaviour for ceramic, a bilinear behaviour is resulted for FGM based on the rule of mixture. In the autofrettage process, projection method is used to compute the distribution of stress. Also, isotropic hardening is assumed for unloading phase. The results illustrate significant effect of ceramic volume fraction used in FGM and autofrettage pressure on the residual stress and pressure capacity of the vessel.
机译:在这项工作中,研究了自动装瓶的FGM球形压力容器的最佳配置。优化问题的目标函数被认为是FG容器的压力容量及其重量。 FG容器的特性被认为是径向变化的。在不使用包辛格效应的情况下,使用可变材料特性(VMP)方法计算自动强化后的残余应力。假设金属的双线性弹塑性行为和陶瓷的完美弹性行为,则基于混合规则,FGM产生双线性行为。在自动强化过程中​​,使用投影法计算应力分布。同样,在卸载阶段假定各向同性硬化。结果表明,FGM中使用的陶瓷体积分数和自增强压力对容器的残余应力和压力容量具有显着影响。

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