獲取材料單軸本構(gòu)關(guān)系的壓入測(cè)試方法研究.pdf

1、西南交通大學(xué)碩士學(xué)位論文獲取材料單軸本構(gòu)關(guān)系的壓入測(cè)試方法研究姓名：姚博申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：蔡力勛；包陳20120622西南交通大學(xué)碩士研究生學(xué)位論文第1l頁AbstractMaterialconsititutiverelationshipsofsmalldimensionalcomponentsandweldingstructuresforsafecontrolofkeyengineeringsareveryim

2、portant，anduptOnowitishardlyvalidtoobtainthembythetraditionalmonotonictensionaltestsIndentationmethodisasmallinvasivetestmethod，whichhashopefulprospectintheestimationonthemechanicspropertiesofsmall—scalesamplesandinservi

3、ceengineeringcomponentsThisthesisinvestigatestheindentationmethodusedtodeterminateuniaxialconsititutiverelationshipsofmetallicmaterialsbasedonfiniteelementsimulationandexperimentalverificationSomeresearchresultsaregivena

4、sfollowed；(1)OnthebasisofprepressinghardeningallimprovedindentationmethodusedtoaccuratelydeterminateelasticmodulusofmaterialsisproposedFor304stainlesssteelandT225NGalloyexprimentsshowthattheaccuracyofelasticmodulusobtain

5、edbythenewmethodisevidentlyhigherthantheresultsofsingle—cone—indenterindentationmethod(2)Withthefiniteelementsimulation，amethodtoobtainconstitutiverelationshipsofmaterialsbasedonenergymethodofindentation(CREMI)correspond

6、ingtOconeindenterwith60degreestodeterminatematerialconstitutiverelationshipisproposed，inwhicharepresentedstressorisregardedasintermediatevariableAccordingtothelinearrelationshipbetweennominalhardness日andBrinellhardness風(fēng)，

7、amethodtoobtainhardnessofmaterialsbasedonenergymethodofindentation(HEMImethod)byusingconstitutiverelationshipsofmaterialsisdeveloped(3)DuetOthepowerlawbetweentheparametersinHollomonconstitutiverelationshipmodelandindenta

8、tionenergyratioWJWt，newCR—EMIH(Hollomon)methodtodetermatematerialconstitutiverelationshipsandHEMIH(Hollomon)methodtogetBrinellhardnesscorrespondingtothecurveofindentationloadendintationdepthof60degreeand703degreearedevel

9、oped，respectively(4)PowerlawrelationshipsbetweenindentationenergyratioWt／礬andtheHollomonparametersfordifferentBrinellhardnessscalesaregiven，thenasphericalindentationmethodtodeterminatematerialconstitutiverelationshipsisd