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首页> 外文期刊>International Journal of Solids and Structures >STRESSES IN A SPHERICAL PRESSURE VESSEL UNDERGOING CREEP AND DIMENSIONAL CHANGES
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STRESSES IN A SPHERICAL PRESSURE VESSEL UNDERGOING CREEP AND DIMENSIONAL CHANGES

机译：球面压力容器承受蠕变和尺寸变化的应力

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摘要

A solution is presented for stresses and displacements in a thick spherical shell subjected to internal and external pressure loads. In addition to elastic behavior, the shell material is assumed to undergo both creep and dimensional changes as the shell is pressurized. The dimensional changes considered are (1) anisotropic swelling or shrinkage induced by neutron irradiation of the shell, or (2) isotropic thermal expansion with a temperature gradient through the shell wall. This solution was developed for pressure vessel modeling of fuel and target particles of the New Production Modular High Temperature Gas-Cooled Reactor (NP-MHTGR), where it is used in predicting particle failure probabilities for large particle batches. It has the advantage that it is computationally much faster than finite element or finite difference approaches. The creep behavior is initially represented with a 4-parameter linear viscoelastic model to include transient and steady-state components, then is extended to more general linear viscoelastic models. The analytical approach, which is applied to a spherical geometry here, may be useful in solving for similar loadings on other vessel geometries. [References: 11]
机译：提出了一种解决内部和外部压力载荷的厚球形壳中应力和位移的解决方案。除了弹性以外，还假设壳体材料在壳体受压时会发生蠕变和尺寸变化。所考虑的尺寸变化是（1）由壳的中子辐照引起的各向异性溶胀或收缩，或（2）具有通过壳壁的温度梯度的各向同性的热膨胀。该解决方案专为新生产的模块化高温气冷堆（NP-MHTGR）的燃料和目标颗粒的压力容器建模而开发，用于预测大批颗粒的颗粒失效概率。它的优点是计算速度比有限元或有限差分方法快得多。蠕变行为最初由包含瞬态和稳态分量的4参数线性粘弹性模型表示，然后扩展到更通用的线性粘弹性模型。在此将分析方法应用于球形几何形状，可能有助于解决其他容器几何形状上的类似载荷。 [参考：11]

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