Mechanical properties of bi-axial warp knitted glass fiberboard under transverse impact

MTS testing machine and Hopkinson pressure bar were used to test the mechanical properties of reinforced composites with bi-axial warp knitted glass fiber fabric and unsaturated polyester resin under transverse impact.The load-displacement curves,failure modes and energy absorption-displacement curves under quasi-static transverse load and dynamic transverse impact were obtained.The results showed that the entire quasi-static transverse loading process can be divided into two stages,namely the rise and fall phase stages,and the deformation of samples was the overall structure response under quasi-static transverse load.At the same time,the displacement and load increased with the increase of impact velocity under dynamic transverse impact,but the displacement has ″hysteresis″ phenomenon.During the dynamic transverse impact process,stress wave transmitted very quickly and the samples showed partial destruction and stratified.