摘要
金属疲劳损伤过程复杂,不同载荷类型与服役环境下金属疲劳损伤机理、变形特性和破坏模式存在较大差异.将疲劳损伤全寿命过程按照循环寿命周次划分为超高周、高周、低周和裂纹扩展4个类别,根据变形响应特性和变形机理特征阐述了各类别疲劳损伤的研究现状及发展趋势,涉及宏观尺度、微细观尺度和宏细微观多尺度理论体系.同时结合工程实际案例,以轧辊和燕尾榫作为代表性构件,分析其疲劳损伤行为与影响因素,探讨了目前疲劳理论在工程实践中的应用及挑战,旨在为金属疲劳损伤全寿命理论体系的完善和关键部件健康质量管控提供理论依据和技术指导.
Abstract
The process of metal fatigue damage is complicated,and the fatigue damage mechanism,deformation characteristics and failure mode of metal under different load types and service environments are quite different.According to cycle life cycles,the whole life process of fatigue damage was divided into four categories:very high cycle,high cycle,low cycle and crack propagation.According to the deformation response characteristics and deformation mechanism characteristics,the research status and development trend of each type of fatigue damage were described,involving macro-scale,micro-scale and macro-micro multi-scale theoretical systems.At the same time,taking roll and dovetail as representative components,the fatigue damage behavior and influencing factors were analyzed based on engineering cases,and the application and challenges of fatigue theory in engineering practice were discussed,aiming to pro-vide theoretical basis and technical guidance for the improvement of metal fatigue damage life theoretical system and the health quality control of key components.
基金项目
国家自然科学基金(52075471)
国家自然科学基金区域创新发展联合基金重点项目(U20A20289)
国家留学基金创新型人才国际合作培养项目(CXXM20240010)
河北省自然科学基金创新群体项目(E2021203011)
NETL
NSTL
维普
万方数据