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摘要: 使用万能材料试验机、扭转试验机和Taylor撞击实验研究了高强铝合金7A04在常温至250 ℃的 准静态、动态本构关系和失效模型。基于实验结果,修改了Johnson-Cook强度模型中的应变强化项以及 Johnson-Cook失效模型中的温度软化项,并结合数值模拟标定了模型参数。实验结果表明,7A04铝合金的 应变和应变率强化效应不显著,失效应变随温度的增加、应力三轴度的减小和应变率的减小而增加。Abstract: Thequasi-staticanddynamicconstitutiverelationaswellasthefracturemodelof7A04aluminumalloy, fromroomtemperatureto250 ℃,wereinvestigatedbyusingauniversaltestingmachine, atorsiontestingmachineandtheTaylorimpacttest.Basedontheexperimentalresults,the strainhardeningtermoftheJohnson-Cookstrengthmodelandthetemperaturesofteningiteminthe Johnson-Cookfracturemodelweremodified.Thematerialconstantswerecalibratedbyacombination ofexperimentaltestsandnumericalsimulations.Experimentalresultsshowthatboththestrainand strainratehardeningeffectarenotsignificantandthatfracturestrainincreaseswiththeincreaseof temperatureandthedecreaseofeitherstresstriaxialityorstrainrate.
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Key words:
- solid mechanics /
- fracturemodel /
- Taylorimpact /
- 7A04aluminumalloy /
- Johnson-Cook model /
- constitutiverelation
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