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《殘余應(yīng)力影響壓痕尺寸和隆起量的研究》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、JournalofMechanicalStrength機(jī)械度2009，31(1)：063—067殘余應(yīng)力影響壓痕尺寸和隆起量的研究RESEARCHoND咖NTATIoNSIZEANDPLASTICPⅡE—UPAFFECTEDBYRESⅡ)IAI，STRESS孫淵王慶明徐建輝張靜(1．上海電機(jī)學(xué)院機(jī)械學(xué)院，上海200240)(2．華東理工大學(xué)機(jī)械學(xué)院，上海200237)SUNYuan·WANGQingMing2XUJianHuiZHANGJing(1．MechanicalEngineeringSchool，ShanghaiDianfiU
2、niversity，Shanghai200240，China)(2．SchoolofMechanicalEngineering，EastChinaUniversityofScienceandTechnology，Shanghai2~237，China)摘要?dú)堄鄳?yīng)力的存在直接影響材料的力學(xué)性能，在壓痕法中影響其壓痕形狀大小、壓入載荷一位移曲線和隆起量，因此通過(guò)比較壓痕形狀大小、壓入載荷一位移曲線和隆起量的大小，可以推斷出構(gòu)件內(nèi)部殘余應(yīng)力，再通過(guò)有限元研究不同程度的殘余應(yīng)力對(duì)壓痕形狀、壓入載荷一位移曲線和隆起量的影響。研究結(jié)果表明，殘余壓
3、應(yīng)力使壓痕尺寸變小，殘余拉應(yīng)力使壓痕尺寸變大，不同性質(zhì)和大小分布的殘余應(yīng)力使壓痕形狀為橢圓形，壓入載荷～位移曲線斜率和隆起量高度隨著殘余壓應(yīng)力的增加而增加，隨著拉應(yīng)力的減小而減小，當(dāng)構(gòu)件內(nèi)部存在一定程度的殘余拉應(yīng)力時(shí)，隨著壓入載荷的繼續(xù)增加出現(xiàn)負(fù)隆起量(沉降量)，沉降量的大小與壓入載荷的大小和殘余拉應(yīng)力的程度有關(guān)。關(guān)鍵詞殘余應(yīng)力壓痕形狀壓入載荷一位移曲線隆起量中圖分類號(hào)TB1153I-I123．4AbstractThemechanicalpropertyofmetalmaterialsisstronglyafectedbytheirr
4、esidualstress．Alsotheindentationsize，inden—rationload-depthcurveandthedevelopmentofpile-·upwitharigidspherearesensitivetotheresidualstressduringtheindentationpro·cess．Sotheresidualstresscouldbededucedbycomparingtotheindentationsizeandheightofthepile—uparoundtheindentati
5、on．Therefore，awiderangeofmaterialswithdiferentresidualstressweredescribedbythefiniteelementmethodtostudytheindentationsize，indentationload—depthcurve，developmentofpile—upinducedbyresidualstress．Resultsshowthattheindentationsizedecreaseswiththecompressionresidualstressan
6、dincreaseswitIlthetensileresidualstress．Theprofileoftheindentationcotddbeoval—shapedduetothedistributionoftensileresidualstressandcompressionresidualstress．Andtheslopeofload—depthcurve，theplasticpile—upheightenlargewi山increasingofthecompressionresidualstressunderload．de
7、creasewithdecreasingofthetensileresidualstress．Itisalsoshownthatthesink-inevolvesandincreasesgradualyascontinuesincreasingloadinducedbythetensileresidualstress，theamountofsink-ineoaldberelatedtothetensileresidualstressandthemagnitudeofload．KeywordsResidualstre~；Indentat
8、ionprofile；Indentationload-depthcurve；Plasticpile-upCorrespondingauthor：SUNYuan，E-mail：shsunyuan@sohu．corn，Tel
