焊錫釬料的多軸力學(xué)性能與低周疲勞壽命研究.pdf

1、翩⑧天畢大謦碩士學(xué)位論文學(xué)科專業(yè)：仆T；≈=加輔作者姓名：女指導(dǎo)教師：陳旭教授ABSTRACT2Withhighprecision，quickresponse，lowconsumeandconvenientoperation，themicrotypetension—torsionalfatiguetestingmachinecanbeusedformechanicalpropertytestsofmetalandothermateria

2、lsThetestingmachinesoftwareweredevelopedtocontroltheaxialandtorsionalmovementatthesametimebyDelphiThesoftwarecancontroltheloadandthepositionofthemachineandgatherthetestdataInthispaperpuretensionandpuretorsionaltest，torsi

3、onalfatiguetestandmultiaxialratchetingtestwereconductedon63Sn一37PbandSn07CuTheresulthaveshownthatthestress—strainrelationships，yieldstress，shearyieldstress，tensilestrength，shearstrengthofthesoldershavestrongstrainrate—de

4、pendenceButtheelasticmodulusandshearmodulushavenotapparentstrainratedependenceThesoldersareshearfractureandcyclicsofteningmaterialsTheaxialstressandshearstrainamplitudeaffecttheratchetingstrainandthefatiguelifeinthemulti

5、axialratchetingtestgreatlyItwasshownthatequivalentstrainapproachandsomecriticalplaneapproachesgavelifepredictiononunsafesideforthesolderwithratchetingstrainWithoutconsideringtheratchetingstrain，theseapproachescan’tbeused

6、topredictfatiguelifeofsolderinmultiaxialratchetingtestCnnsideringtheratchetingstrain，theCoffinmodelgavegoodprediction，andmostofthepredictedvaluesfcllwithinascatterbandof2Keywords：solder，fatiguetestingmachine，multiaxialra

7、tcheting，ratchetingstrain，fatiguelifeprediction2TheprojcotissupportedbyNationalNaturalScienceFoundationofChina(10272080)andtheTeachingandResearchAwardProgramforOutstandingYoungTeachersinHigherEducattonInstitutionsofMOE，P