Dynamic mechanical properties of steel fiber reinforced concrete and parameter calibration of HJC constitutive model
The effects of different volumes of steel fibers and copper-plated steel fibers on the dynamic mechanical properties of concrete are explored,and the applicability of calibrated constitutive model parameters to steel fiber reinforced concrete and copper-plated steel fiber reinforced concrete is discussed.In this paper,seven groups of specimens are prepared by adding steel fibers of 0.5%,1%and 1.5%volume fraction to high-strength concrete.The static mechanical properties test and the split Hopkinson pressure bar test(SHPB)are carried out respectively.Based on the static and dynamic mechanical experimental results,the parameters of Holmquist-Johnson-Cook(HJC)constitutive model are modified,and the effectiveness of the HJC model parameters is verified by numerical simulation of the finite element analysis software.The results show that the dynamic peak compressive strength of concrete increases with the increase of fiber content at 0.5%,1%and 1.5%volume fraction.The calibrated HJC model has a good effect on predicting the dynamic peak compressive strength of steel fiber reinforced concrete,and the simulated stress-strain curve is roughly consistent with the SHPB test results.The failure process of the specimen in the dynamic impact experiment simulated by the erosion criterion provides a reference for the impact design of steel fiber reinforced concrete.
steel fiberanti-impact performanceSHPB testHJC constitutive model
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