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摘要: 通过求解波动方程,结合有限结构-时间破坏准则,得到了动态载荷下脆性材料单轴拉伸强度应变 率效应的解析表达式。分析结果表明:材料动态强度的应变率效应具有明显的结构响应特征,即材料动态强 度除与应变率和静态参数相关外,还显著地依赖于外载荷结构及其与材料间的相互作用,因而动态强度不是 表征材料动态破坏的内禀材料性质;此外,由于在不同的外载荷条件下材料将表现出不同的动态强度,这是导 致实验结果离散性大的内在因素。Abstract: Anexplicitexpressionforthestrain-rateeffectontheuniaxialtensilestrengthofbrittlematerialsunderdynamicloadingswasderivedbysolvingthewaveequationtogetherwiththes -calledfinitestructural- timefailurecriterion.Itisshownthatthereisanobviousstructuralresponsecharacteristicforthedynamicstrength; thatis,apartfromonthestrainrateandthestaticmaterialconstants, itdependsremarkablyontheloadingaswellastheinteractionbetweentheloadingfeatures andthematerial,andthusthedynamicstrengthcannotbeoneoftheintrinsicmaterialproperties. Moreover,itisalsofoundthatthepreviousexperimentaldatashouldhaveintrinsicallyhighdiscretenessbecausethedynamicstrengthsofmaterialattaind fferentvaluesunderdifferentloadings.
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Key words:
- mechanicsofexplosion /
- strain-rateeffect /
- failurecriterion /
- brittlematerials /
- dynamic loadings
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