高温高压用耐热钢弹性蠕变损伤本构模型研究

摘要

In the light of the fact that elastic creep damage happens to heat resistant steel used as pressure elements like steam pipeline and steam pockets in heat-engine plants at high temperature and under high pressure,this article gives a complete constitutive description of the damage,building up the theory of phenomenology about creep damage.It dwells here upon the constitutive model of tlastic creep damage of heat resistant steel,establishing a corresponding variation principle and finite element discretization form,thus introducing complete numerical variational methods.%针对火电厂中蒸汽管道与汽包类承压部件用的耐热钢，在承受高温高压时发生弹性蠕变损伤问题，给出完整的损伤本构描述，建立起唯象学蠕变损伤理论。主要提出耐热钢的弹性蠕变损伤本构模型，建立起相应的数值变分原理以及有限元离散化形式，从而形成完整的数值变分方法。