大厚度铝合金板疲劳裂纹扩展特性研究现状及关键问题探讨  

Research Status and Key Problems Discussion on Fatigue Crack Propagation Characteristics of Aluminum Alloy Plate with Large Thickness

作　　者：伍黎明[1] 何宇廷[1] 张腾[1] WU Liming;HE Yuting;ZHANG Teng(School of Aviation Engineering,Air Force Engineering University,Xi'an 710038,China)

机构地区：[1]空军工程大学航空工程学院,西安710038

出　　处：《机械工程材料》2024年第2期1-7,共7页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(52175155)。

摘　　要：试样厚度增加引发的裂纹扩展“马鞍效应”是厚度与三维裂纹端部应力应变场内在联系的表象反映,在未得出这种内在联系机理与规律的情况下,基于传统模型对大型机械设备中的厚板及变厚度板进行损伤容限评定必然存在很大的风险。以大厚度铝合金板为研究对象,从三维裂纹端部应力应变场与裂纹扩展形貌之间的关系、疲劳裂纹扩展的厚度效应、腐蚀与疲劳共同作用下裂纹扩展机理与模型等三个方面,对裂纹扩展相关问题的研究现状进行了总结分析,对大厚度铝合金板疲劳裂纹扩展特性研究的关键问题进行了探讨。The“saddle effect”of crack growth caused by the increase of specimen thickness is a representation of the connection between thickness and the stress-strain field at the three-dimensional crack end.Without this internal connection mechanism and rule,the damage tolerance assessment of large thickness and variable thickness plates in large mechanical equipment based on traditional models must have great risks.With large thickness aluminum alloy plate as the research object,the current research status of crack propagation related issues is summarized and analyzed from three aspects,including the relationship between three-dimensional stress-strain field at crack end and crack propagation morphology,thickness effect of fatigue crack propagation,crack propagation mechanism and model under the joint of corrosion and fatigue.The key problems in studying the fatigue crack propagation characteristics of aluminum alloy plate with high thickness are discussed.

关 键 词：大厚度铝合金板 疲劳裂纹扩展 研究现状 关键问题 

分 类 号：V216.3[航空宇航科学与技术—航空宇航推进理论与工程]