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1、几个强度理论的屈服实验研究牛杰1,2,田杰1.2,张雅琼1,2,刘光连2,•孟力平3(1.高性能复杂制造国家重点实验室,长沙410083:2.中南大学机电工程学院,长沙410083;3.中南大学材料科学与工程学院,长沙410083)摘要:本文根据多种类塑性金属的二向和三向拉仲与压缩组介主应力屈服强度实验数据,对Trcsca强度理论、Mises强度理论、Coulomb-Mohr强度理论、Beltrami最大能量理论、极限应变能强度理论等儿个强度理论计算的相对谋差进行了比较分析,得到极限应变能强度理论计算的相对谋差在10%以下为最小与实验结杲相符,Tresca强度理论、Mises强度理论、
2、Coulomb-Mohr强度理论计算的相对误差有时分别达・36%、・27%、・23%,计算结果比试验结果较偏安全。拉伸屈服强度和压缩屈服强度相等材料的剪切屈服强度为拉伸屈服强度的0.707倍。极限应变能强度理论能进行二向和三向拉仲与压缩组合主应力强度计算,在全拉伸和全压缩主应力状态下与Rankine强度理论一致,具冇工程应川丽景和价值。关键词:犁性金属;屈服;强度实验;强度理论;极限应变能强度理论中图分类号:TH114YIELDEXPERIMENTALSTUDYONSEVERALSTRENGTHTHEORIESNIUJiei,2,TIANJiei,2,ZHANGYaqiongi,2,L
3、IUGuanglianz,MENGLipinga(1.StateKeyLaboratoryofHighPerformanceComplexManufacturing,ChangSha410083;2.SchoolofMechanicalandElectricalEngineering,CentralSouthUniversity,ChangSha410083;3.SchoolofMaterialScienceandEngineering,CentralSouthUniversity,ChangSha410083)Abstract:Inthispaper,basedontheyields
4、trengthexperimentdataofvarioustypesofplasticmetalsunderbiaxialandtriaxialtensile-compressivecombinedprincipalstress,therelativeerrorcalculatedbyTrescastrengththeory,Misesstrengththeory,Coulomb-Mohrstrengththeory,Beltrami'smaximumenergytheoryandlimitingstrainenergystreng什】theory(LSEST)etc.iscompa
5、redandanalyzed.AccordingtoLSEST,itisobtainedthattherelativeerrorsthatlessthan10%aretheminimum,whichisconsistentwiththetestresult,whiletherelativeerrorscalculatedbyTrescastrengththeory,Misesstrengththeory,Coulomb-Mohrstrengththeoryamountto-36%,-27%,-23%respectivelyinsomesituation,whichareonsafesi
6、decomparedwiththetestresults.Formaterialswithequaltensileandcompressiveyieldstrength,theshearyieldstrengthis0.707timesofthetensileyieldstrength.Furthermore,LSESTcanbeusedtocalculatethestrengthunderbiaxialandtriaxialtensile-compressivecombinedprincipalstress,whichisconsistentwithRankinestrengthth
7、eoryunderfulltensileandfullcompressiveprincipalstressstate.ItshowsthatLSESThastheprospectandvalueforengineeringapplication.Keywords:plasticmetal;yield;strengthexperiment;strengththeory;limitingstrainenergystrengththeoryo引言强度