轻合金加工技术Vol51,No6LIGHTALLOYFABRICATIONTECHNOLOGYD0I:10.13979/j.1007-7235.2023.06.009测试残余应力的层削法在7140铝合金厚板上的应用王军强",张宗权²，曹海龙"，黄东男,刘成（1.中铝材料应用研究院有限公司，北京102200；2.西南铝业（集团）有限责任公司，重庆401326）摘要：为满足轻量化和整体结构强度要求，航空航天结构件广泛采用大规格铝合金结构件。大规格铝合金结构件多采用铝合金厚板机加工而成，材料去除率可达80%以上。残余应力在板材厚度上的不均匀分布会引起加工变形等一系列问题。本研究采用层削法逐层去除材料，残余应力失去平衡，引起板材弯曲变形。基于应力释放产生的挠度增量、未切削部位刚度及弹性模量与残余应力的关系，获得相应层削深度的残余应力。采用该方法开展7140铝合金厚板全厚度残余应力的测试，并通过X射线法测试技术对表面残余应力进行测试校核，通过切缝翘曲法进行内部残余应力测试校核。测试结果表明，层削法残余应力测试方法能够有效表征7140铝合金厚板内部的残余应力。关键词：7140铝合金厚板；层削法；挠度；残余应力中图分类号：TG386.1文献标识码：A文章编号：1007-7235(2023)06-0057-05Applicationoflayerremovalmethodtomeasureresidualstresson7140aluminumalloyplateWANGJunqiang,ZHANGZongquan’,CAOHailong',HUANGDongnan',LIUCheng'(1.ChinalcoMaterialsApplicationResearchInstituteCo.,Ltd.,Beijing102200,China;2.SouthwestAluminum(Group)Co.,Ltd.,Chongqing401326,China)Abstract:Large-scalestructuralpartsarewidelyusedinordertomeetthelightweightandoverallstructuralstrengthofaerospacestructures.Large-scalealuminumalloystructuralpartsaremostlymachinedfromaluminumalloyplates,andthematerialremovalratecanreachmorethan80%.Theunevendistributionofresidualstressinthethicknessoftheplateswillcauseaseriesofproblemssuchasmachiningdeformation.Inthisstudy,thealloyplatewasremovedlayerbylayerbylayerremovalmethod,andthentheresidualstresslostbalance,thebendingdeformationoftheplatewascaused.Basedonthedeflectionincrementcausedbystressrelease,therelationshipbetweenthestiffnessandelasticmodulusoftheun-cutpartandtheresidualstress,theresidualstressofthecorrespondingdelaminationdepthwasobtained.Thefull-thicknessresidualstressof7140aluminuma...
