Performance Testing Of Domestic Aramid Fibers And The Study Of Fiber-reinforced Composites Anti-penetration Performance

Researches about bulletproof composite was focused on the design of fabric structures,the selection of fiber materials and the improvement of interlaminar adhesion.Fiber reinforced resin matrix composites was an important part of composite armour,high-strength woven fabrics are becoming increasingly common in military and civil protection applications.While,there are little researches on woven fabric structure for fiber reinforced resin matrix composites.In this paper,the mechanical properties of domestic and foreign aramid yarns and fabrics are investigated.And four structures of aramid woven woven fabrics with thermoplastic polycarbonate matrix were selected from domestic manufacturers’ yarns to be moulded and prepared into composite target plates.The anti-penetration mechanism of fiber reinforced resin matrix composite was studied by combining ballistic performance experiment with finite element simulation analysis.(1)To investigate the effects of aramid fiber properties on the ballistic performance of fiber-reinforced resin matrix composites,this paper selects aramid fibers from different manufacturers of domestic and abroad for comparison,and investigates the factors affecting aramid fire properties on the ballistic performance of composite target plates.Firstly,the mechanical properties of aramid yarns from different manufacturers were compared and the loss of yarn properties in fabrics from different manufacturers was tested.It was found that the surface friction,axial stretching and washing process of the weaving process would cause the loss of strong performance of yarns.The warp yarns have higher performance losses than the weft yarns due to the greater traction.Analysis of the results shows that the mechanical properties of the yarn cause an obvious influence on the fabric properties,while the surface density of the fabric and whether the yarn is washed or not will also have impacts on the mechanical properties.(2)Four fabric structures(plain,twill,basket and satin)were moulded with polycarbonate(PC)to form two,four and six layers composite target plates,and the whole process of ballistic performance test of composite target plate was recorded by high speed camera.The experimental results show that the fabric structure of the composite target plate and the number of layers of the target plate have significant effects on the anti-penetration performance.The satin composite target plate showed the fastest strain transfer rate and better ballistic performance.Comparing the transverse displacements of the four composites captured by highspeed photography,the satin fabric composite target had the largest transverse displacements than the other three specimens which means the satin fabric composite target absorbed more kinetic energy and dissipated more energy.(3)The effects of four fabric structures(plain,twill,basket and satin)on the ballistic properties of four composites was investigated by finite element simulation analysis.The analysis results show that the polycarbonate(PC)matrix can improve the uneven stress distribution of the fabric with a low number of nodes and increase the energy transfer efficiency to the secondary yarns.In addition,satin composite target panels exhibited faster strain transfer rates and better ballistic performance due to their lower yarn flexure,resulting in a wider range of stress wave transfer and faster energy dissipation in the reinforcement fabric.This study provides a reference for structural design to improve the ballistic properties of composites.