第8期2023年8月机械设计与制造MachineryDesign&Manufacture8930408奥氏体不锈钢弹塑性力学演变研究王加宁1,李光明²,孙建桂3,胡效东1(1.山东科技大学机械电子学院,山东青岛266590;2.山东思科赛德矿业安全工程有限公司,山东泰安271000;3.沂南县计量测试所,山东临沂276000)摘要:采用小冲杆测试技术测试30408奥氏体不锈钢的屈服强度及抗拉强度分别为195.43MPa、804.34MPa,运用扩展有限元的方法模拟了小冲杆试验的破裂过程,并基于弹塑性力学分析了某煤矿应力计压力枕的弹塑性变形。结果表明:采用扩展有限元法模拟小试样破裂位置与试验破裂位置基本吻合,断裂位置先经历减薄,减薄区发生最大的塑性变形为123.1%,之后随着应力的增大,试件产生破裂。压力枕的弹塑性分析与试验结果的相对误差在(0.21~6.65)%之内,表明该方法用于应力计压力枕的设计是可行的。这里指在探索大塑性变形零部件的精细化设计问题,减少试验次数,提高设计精度。关键词:小冲杆测试;30408奥氏体不锈钢;应力计压力枕;弹塑性力学中图分类号:TH16文献标识码:A文章编号:1001-3997(2023)08-0089-05InvestigationonElastoplasticMechanicalEvolutionof30408AusteniticStainlessSteelWANGJia-ning',LIGuang-ming’,SUNJian-gui',HUXiao-dong'(1.SchoolofMechanicalandElectronicEngineering,ShandongUniversityofScienceandTechnology,ShandongQingdao266590,China;2.ShandongSucceedMiningSafetyEngineeringCo.,Ltd.,ShandongTaian271000,China;3.YinanCountyInstituteofMetrologyandTesting,ShandongLinyi276000,China)Abstract:Theyieldstrengthandtensilestrengthof30408austeniticstainlesssteelweretestedusingthesmallplungertesttech-nologytobe195.43MPaand804.34MParespectively.Theruptureprocessofthesmallplungertestwassimulatedbytheextendedfiniteelementmethod,andbasedonelastoplasticmechanics,theelastoplasticdeformationofthepressurepillowofacoalminestressgaugeisanalyzed.Theresultsshowthattherupturepositionofthesmallsamplesimulatedbytheextendedfiniteelementmethodisbasicallyconsistentwiththetestruptureposition.Thefracturepositionfirstundergoesthinning,andthelargestplasticdeformationinthethinnedareais123.1%.Then,asthestressincreases,thespecimenproducerupture.Therelativeerrorbetweentheelasto-plasticanalysisofthepr...