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摘要: 利用?74mmSHPB实验装置对钢纤维活性粉末混凝土(RPC)进行动态压缩实验和动态劈裂拉 伸实验。获得了钢纤维RPC在1~102s-1应变率加载下的动态力学参数。对试件内的动态应力分布进行数 值模拟,验证了动态实验的有效性。结果表明,钢纤维RPC的动态压缩和动态劈裂拉伸的力学性能均表现出 显著的应变率效应。随着应变率的增加,钢纤维RPC冲击压缩破坏应力、冲击压缩破坏应变、弹性模量、动态 劈裂拉伸破坏应力均有一定程度的增加,动态拉压比相对静态拉压比也有显著的提高。Abstract: Dynamiccompressiveandtensileexperimentswereconductedforthesteel-fiberreinforced reactivepowderconcrete(RPC)byusinga74-mm-diameterSHPBsetup.Thedynamicmechanical parameterswereobtainedforthesteel-fiberreinforcedRPCatthedifferentstrainratesof1~102s-1. Thedynamicstressdistributioninthespecimenwasnumericallysimulatedtovalidatethedynamic tensileexperiments.Investigatedresultsrevealthatboththedynamiccompressiveandtensilemechanicalpropertiestakeonobviousstrain- rateeffects.Withtheincreaseofstrainrate,thefollowing parametersallincreasetoacertainextent,whichincludethedynamiccompressivestrength,strain andelasticmodulus;andthedynamicsplittingtensilestrength.Andtheratioofdynamictensileto compressivestrengthhasanobservableincreasecomparedwiththeratioofstatictensiletocompressivestrength.
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Key words:
- solidmechanics /
- effectsofstrainrate /
- SHPB /
- reactivepowderconcrete /
- dynamiccompression /
- dynamictensile
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