Experimental Study on Dynamic Compressive Properties of Steel-PE Hybrid Fiber Cement-Based Composites
Steel fibers and PE fibers were mixed into cement-based matrix materials,maintaining a to-tal fiber volume fraction of 2%.By varying the proportion of the two fibers,specimens E2,E1.5S0.5,E1S1,E0.5S1.5,and S2 were prepared.Dynamic compression tests were conducted un-der high strain rates(30-120 s-1)using a Split Hopkinson Pressure Bar(SHPB).The failure modes,dynamic compressive strength,toughness,and strain rate effects of the steel-PE hybrid fiber cement-based composites were analyzed.The experimental results showed that the composites exhibited a dis-tinct strain rate effect,with increases in dynamic compressive strength,toughness,and the Dynamic Increase Factor of Compressive Strength(DIF)as the strain rate increased.PE fibers provided superi-or toughening performance at strain rates of 60-80 s-1,while steel fibers were more effective at 100 s-1.As the PE fiber content increased,the stress-strain curve showed more prominent strain hardening.When the steel fiber content reached 1.5%or more,both the dynamic compressive strength and tough-ness improved,indicating that an appropriate amount of steel fibers enhances the strain rate sensitivity of the material′s dynamic compressive strength.The hybrid fiber specimens outperformed those with only PE or steel fibers in terms of mechanical properties.A comprehensive analysis of dynamic com-pressive strength,toughness,and DIF suggested that the optimal fiber ratio for resisting impact loads was 0.5%PE fibers+1.5%steel fibers.
steel-PE hybrid fiberdynamic compressiondynamic increase factor of compressive Strengthstrain rate effectSplit Hopkinson Pressure Bar
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维普
