文献类型：期刊文献

中文题名：含凹坑缺陷承压结构的安定、棘轮及低周疲劳行为分析

英文题名：Shakedown,ratcheting and low?cycle fatigue behavior analysis of pressure?bearing structures with pit defects

作者：李佳琳[1];王骁晓[1];陈浩峰[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237

年份：2026

卷号：43

期号：1

起止页码：43

中文期刊名：压力容器

外文期刊名：Pressure Vessel Technology

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划项目(2023YFF0614903);国家自然科学基金项目(52375145);中国博士后科学基金项目(2023TQ0119,GZC20240467,22024M760909);上海市白玉兰人才计划浦江项目(24PJD026);上海市自然科学基金项目(25ZR1402111)。

语种：中文

中文关键词：压力容器;凹坑缺陷;线性匹配法;疲劳寿命

外文关键词：pressure vessel;pit defect;linear matching method(LMM);fatigue life

摘要：针对压力容器常在高温、高压及腐蚀性介质等恶劣工况下运行时,凹坑、裂纹等缺陷显著降低其承载能力并引发安全事故的关键问题,采用线性匹配法(LMM)系统分析了高温承压结构中凹坑缺陷的几何特征对疲劳行为的影响机制。研究结果表明,局部减薄凹坑会显著降低反向塑性极限,其中沿容器轴向的局部减薄凹坑影响程度最大,而椭圆形凹坑的极限载荷基本不受凹坑尺寸的影响;在高温环境下,轴向局部减薄凹坑使总应变范围增加53.8%,周向局部减薄凹坑仅使总应变范围增加18.1%;椭圆形凹坑的总应变范围受凹坑尺寸影响显著,其随短轴(轴向尺寸)增大而增大,随长轴(周向尺寸)增大而减小。研究可为延长设备使用寿命、提高生产效率提供理论参考。
Addressing the critical issue that defects such as pits and cracks significantly reduce the load?bearing capacity of pressure vessels and lead to safety accidents under harsh operating conditions involving high temperature,high pressure,and corrosive media,this study employs the linear matching method(LMM)to systematically analyze the influence mechanism of geometric characteristics of pitting defects on the fatigue behavior of high?temperature pressure?bearing structures.The results indicate that local thinned pits significantly reduce the reverse plastic limit,with the axial local thinned pit having the most significant impact,while the limit load of elliptical pits is largely unaffected by pit size.Under high?temperature environments,the axial local thinned pit increases the total strain range by 53.8%,whereas the circumferential local thinned pit increases it by only 18.1%.The total strain range of elliptical pits is significantly influenced by pit size,increasing with the short axis(axial dimension)and decreasing with the long axis(circumferential dimension).This study provides a theoretical reference for extending equipment service life and improving production efficiency.