Research on dynamic mechanical properties of CFRP materials based on rate dependent improved bridging model

DOI:	10.11809/bqzbgcxb2024.03.024
Keywords:	CFRP; bridging model; dynamic compression; impact; failure mechanism
Abstract:	The bridging model has high accuracy in predicting the static mechanical properties of CFRP materials, but there are currently few reports on describing the dynamic mechanical properties of CFRP materials based on the bridging model.In order to fill this research gap, this paper improves the bridging model by using the constitutive equation considering the strain rate effect and the strength criterion.The improved model was confirmed by using literature experimental data, and the CFRP laminated structure was designed and prepared to SHPB dynamic experiment for the use environment of in which the penetration missiles were used.The theoretical predicted modulus is basically consistent with the experimental results, and the theoretical strength value is about 7% higher than the experimental value, verifying the applicability of the rate dependent improved bridging model in dynamic load environments. Based on the existing CFRP shell penetration test results of the research group, the theoretical model was deeply validated for predicting the performance of CFRP materials under impact loads.By further observing the microscopic structure of the specimen and analyzing the corresponding numerical simulation results, it can be found that the dynamic failure mode of the specimen in the X direction is dominated by interlayer delamination, while the Y direction specimen is mainly compression failure of the fiber and shear failure of the matrix.This article provides a feasible analysis method for predicting the mechanical behavior of CFRP materials under dynamic loads such as impact resistance.
Published:	2024-03-28
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