高温高压用耐热钢弹性蠕变损伤本构模型研究

Research on Constitutive Model of Elastic Creep Damage of Heat Resistant Steel under the condition of High temperature and High Pressure

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。

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.