Study On Dynamic Tensile Of BFRP-FRCM Composite Layer

Man made and accidental explosion impact will damage the key structural components and non structural components,resulting in casualties and property losses.It is urgent to reinforce it against explosion and impact.Basalt fiber reinforced polymer composites composites has good reinforcement performance,which has obvious technical advantages and great development potential.A large number of studies at home and abroad are focused on its static mechanical properties.However,due to the lack of comprehensive understanding of the mechanical characterization of BFRP-FRCM composites under dynamic tensile behavior,it is necessary to further study and analyze the influence of fiber type,basalt grid density and dynamic loading rate on the dynamic tensile properties of BFRP-FRCM composites.In this paper,the effects of fiber type,loading rate and mortar strength on the dynamic mechanical properties of FRCM are studied by means of Split Hopkinson Tension Bar,the effects of basalt grid layer,cement-based composites type and loading rate on the dynamic tensile properties of BFRP-FRCM are studied by Instron respectively.The result of tensile of BFRP-FRCM is analyzed by simulation.Here are some results:（1）Compared with specimens with PVA fiber,the increase of tensile strength of specimens with PP fiber in the range of 50s^-1-200s^-1strain rate is larger.The addition of PVA fiber can obviously enhance the ductility of the specimen before failure.In terms of energy absorption capacity,specimens with PVA fiber is always higher than that of PP fiber.When the water binder ratio is 0.25,The strain rate effect of specimens with PVA fiber on energy absorption capacity is larger.（2）For specimens with PVA fiber,with the increase of strain rate and mesh layer,the ultimate dynamic tensile load tends to increase;for specimens with PP fiber,with the increase of the number of grid layers,the ultimate load increase,the strain rate effect of the specimens with one grid layer is not obvious.The strain rate effect of the specimen with three-layer grid is more obvious.The energy absorption ability of the specimen with one layer of grid is the worst.Under the same number of grid layers and the same loading rate,the ultimate load values of the specimens doped with PVA fiber and PP fiber are quite different.The strain rate effect of PVA fiber is higher than that of PP fiber.Under the same number of grid layers,the energy absorption capacity of the sample with PVA fiber is higher than that of the sample with PP fiber.（3）The simulation model of BFRP-FRCM composite layer is established,and the dynamic performance experiment is simulated,and the validity of the model is verified.The numerical simulation can simulate the failure of the test accurately and accurately simulate the development and change of load displacement curve.The peak value and the test results are in good agreement with each other.