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Case Study of Nonlinear Buckling with Shape Distortion Due to Thermal Load

机译:热载荷引起的形状畸变非线性屈曲的案例研究

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Thermal load is one of the most important design conditions that should be considered carefully in engineering practice. Most inner-pressure vessels suffer thermo-mechanical ratcheting or unacceptable plastic deformation under cyclic thermal stress produced by inside heat source and pressure-induced primary stress. However, thermal load is also a crucial factor for external-pressure vessels where the failure model of buckling should not be ignored. The effect of thermal load on buckling is not only thermal stress itself but also shape distortion due to thermal load. In some cases, the latter is more important. In this paper, an external-pressure thin-walled ellipsoidal head with heating jackets has been studied. The temperature of this structure is uniformly distributed along the thickness direction but changes alternately between hot and cold along the meridional direction, which will have a significant effect on buckling behavior of this typical structure. Buckling load is sensitive to initial defect and small deformation. Several comparative calculations based on nonlinear buckling analysis have been conducted and some laws are established. Finally, some useful conclusions and suggestions are proposed for engineering design.
机译:热负荷是最重要的设计条件之一,在工程实践中应仔细考虑。大多数内部压力容器在内部热源和压力引起的主应力产生的循环热应力下会遭受热机械棘轮作用或不可接受的塑性变形。但是,热负荷也是外部压力容器的关键因素,在外部压力容器中,屈曲的失效模型不容忽视。热负荷对屈曲的影响不仅是热应力本身,还包括由于热负荷引起的形状变形。在某些情况下,后者更为重要。本文研究了带有加热夹套的外压薄壁椭圆头。该结构的温度沿厚度方向均匀分布,但沿子午线方向在热和冷之间交替变化,这将对该典型结构的屈曲行为产生重大影响。屈曲载荷对初始缺陷和小变形敏感。进行了几种基于非线性屈曲分析的比较计算,并建立了一些定律。最后,对工程设计提出了一些有益的结论和建议。

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