CAJ | 학술논문

在应力腐蚀环境下，核电关键结构裂纹的萌生扩展开裂对其服役寿命的影响至关重要，而裂纹尖端附近力学场的变化情况表征裂纹尖端的扩展特性。以核电关键结构材料304奥氏体不锈钢作为研究对象，基于ABAQUS有限元软件分析材料的本构关系模型对裂尖力学场的影响。结果表明：材料模型的变化对裂纹尖端的塑性区大小以及应力应变场影响较大。该研究成果为准确预测核电关键结构的裂纹扩展速率提供理论依据。
재응력부식배경하，핵전관건결구렬문적맹생확전개렬대기복역수명적영향지관중요，이렬문첨단부근역학장적변화정황표정렬문첨단적확전특성。이핵전관건결구재료304오씨체불수강작위연구대상，기우ABAQUS유한원연건분석재료적본구관계모형대렬첨역학장적영향。결과표명：재료모형적변화대렬문첨단적소성구대소이급응력응변장영향교대。해연구성과위준학예측핵전관건결구적렬문확전속솔제공이론의거。
Crack growth of nuclear power key structural has crucial impact on their service life under environmental stress corrosion .The extended feature of crack tip is characterized by mechanics field changes near the crack tip .Nuclear power key structural material 304 auste‐nitic stainless steel is used as the research object in this paper .Analysis of the material Con‐stitutive relationship model has influenced on the mechanics field of crack tip based on ABAQUS finite element software .The results shown that changes of material models have impact on plastic zone size near crack tip and the stress and strain fields .Researches in this paper provide theoretical basis for accurate prediction of the crack grow th rate of nuclear power critical structures .