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Analysis of Thermoelasto/Viscoplastic Problem in a Container Made of FRM Subjected to Thermal Shock

FRM容器热冲击下的热弹/粘塑性问题分析

基本信息

批准号：
63550082
负责人：
HATA Toshiaki
金额：
$ 1.41万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550082/
关键词：
Thermal Stress Wave Propagation Thermal Shock Elasto Viscoplasticity Anisotropy 衝撃

项目摘要

The design of pressure vessels of nuclear reactor of rocketーpowered high speed engines has recently created a renewed interest in the theory of dynamic thermal stress problems. Since these structures have to withstand the thermal stresses as well as pressures, they are usually constructed in the form of thickwalled pressure vessels, such as spheres or cylinders. Moreover, to increase the strength, some pressure vessels are made of anisotropic materials such as FRM, the properties of which are different in different directions. In designing such structures, one must take into consideration the dynamic thermoelasto/viscoplastic response to high thermal stresses.In thermoelasto/viscoplastic analyses, it is very important to obtain an accurate elastic solution, for the accuracy of the elasto/viscoplastic solution depends on that of the elastic one. However, in literature, there are few analytical works concerned with the thermo-dynamic problems except some numerical works.In this study, the author extended the method of the ray theory to the dynamic thermoelasto/viscoplastic deformation of an anisotropic container subjected to thermal shock. Materials which exhibit this type of behavior are usually classified as FRM with elasto/viscoplastic properties. Following the method, we derived a general solution for the dynamic thermoelasto/viscoplastic problem of a transversely isotropic thickーwalled spherical container subjected to thermal shock. The numerical results show how the dynamic thermal stresses in a container with viscoplastic properties vary with time. These results are useful for the design of containers made of FRM.

近年来，火箭发动机核反应堆压力容器的设计引起了人们对动态热应力理论的新的兴趣。由于这些结构必须承受热应力以及压力，它们通常被构造成厚壁压力容器的形式，例如球体或圆柱体。此外，为了提高强度，有些压力容器采用FRM等各向异性材料制成，其性能在不同方向上不同。在设计此类结构时，必须考虑热弹/粘塑性动态响应，在热弹/粘塑性分析中，获得精确的弹性解是非常重要的，因为弹/粘塑性解的精度取决于弹性解的精度。本文将射线理论的方法推广到各向异性容器在热冲击作用下的动态热弹/粘塑性变形问题，并对该问题进行了数值模拟。表现出这种行为的材料通常被归类为具有弹性/粘塑性特性的FRM。根据该方法，我们导出了横观各向同性厚壁球壳在热冲击作用下的动态热弹/粘塑性问题的一般解。数值结果显示了粘塑性容器中动态热应力随时间的变化规律。这些结果对FRM材料容器的设计具有参考价值。