Finite element simulation of anti-stab mechanism of aramid flexible composites
In order to predict the anti-stabbing performance of aramid flexible composite and to investigate the basic law of the response of aramid flexible composites to knife penetration,aramid flexible composites were prepared by impregnation with multi-phase shear thickening solution and coating with silicon carbide/thermoplastic polyurethane as well as extraction and quasi-static stabbing experiments.Finite element simulations of a single-layer quasi-static knifed aramid com-posite model and a multi-layer dynamic knifed aramid composite model were established by refi-ning the friction coefficients,and Python script was used to effectively simplify the modeling process to investigate the anti-knife stabbing mechanism of aramid flexible composites.The re-sults show that the friction coefficient between yarns of the silicon carbide/thermoplastic polyure-thane coated aramid composites is the highest.The friction coefficient between yarns impregnated with shear thickening solution is good and does not limit yarn stretching deformation,and has good anti-stabbing property.The main failure mode of multi-layer aramid fabric during dynamic puncture process is yarn breakage and yarn deformation is less.The establishment of the model can provide a reference for fast and accurate prediction of the anti-stabbing properties of flexible composites.
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