Experimental investigation of the effect effective of factors and parameters on the punch on the properties of quasi-static punching shear the glass/epoxy composite

In this paper, the effective diameter of the punch and the speed of loading and geometry penetrating properties of quasi-static punching (QS-PS) laminate composites has been studied experimentally. The composites have 12 layers of 2D woven glass fiber with area density of 200 g/m2, is manufactured by Hand lay-up method. Epoxy resin systems is made of a diglycidyl ether of bisphenol A (DGEBA), Epon 828, as the epoxy prepolymer and Epikure F-205 as the curing agent. In this study, of two ratio of span 5 and 10 and three strain rate 5, 250 and 500 mm / min as well as three indenters with flat, conical and ogival used. The results of investigation ratio of span show that with decrease half size in the ratio of span, deform the target page lower and contact force 20% increases. Results punching shear at different strain rates shows that with increasing strain rate, composite strength increases. In comparing the results of indenter with different geometries indicate that the flat indenter has higher contact force and maximum of the absorbed energy is by the cone indenter.