压力容器2023，Vol.40Issue(10)：38-46,57,10.DOI:10.3969/j.issn.1001-4837.2023.10.005
类裂纹不连续区高温蠕变疲劳评价方法对比
Comparative research on creep-fatigue damage assessment methods for the crack-like discontinuity
摘要
Abstract
There is a large quantity of crack-like discontinuities caused by the welding process.The structures with crack-like discontinuities at high temperature become more susceptible to the creep rupture failure and fatigue damage.Based on the crack-like discontinuity of the welding zone of a penetration structure,the creep-fatigue damage analysis was carried out by ASME NH and RCC-MRx elevated temperature design(ETD)codes,and the determination mechanism of the characteristic distance in RCC-MRx was revealed.The results show that,for the crack-like discontinuity,compared to the σ-d approach based on the equivalent-stress principle in RCC-MRx,it is difficult to determine the equivalent stress concentration factor accurately,while the creep parameters are sensitive to primary stresses,as a result,with the variation of the stress concentration level from non-significant to significant,the creep and fatigue damage coefficient shows a change tendency from slightly conservative to non-conservative.It's recommended that the high-temperature creep-fatigue damage assessments should be carried out for the crack-like region using RCC-MRx code.关键词
类裂纹不连续区/ASME NH/RCC-MRx/高温蠕变-疲劳损伤Key words
crack-like discontinuity/ASME NH/RCC-MRx/high temperature creep-fatigue damage分类
机械制造引用本文复制引用
庾明达,邵雪娇,蒲卓,李辉,张瀛,刘贞谷..类裂纹不连续区高温蠕变疲劳评价方法对比[J].压力容器,2023,40(10):38-46,57,10.基金项目
国家自然科学基金项目(12102416) （12102416）
