Effect of compressive loading speed and stacking sequence on mechanical characteristics of satin weave E-glass/epoxy composites

Abstract

This article experimentally investigated the in-plane loading speed dependent mechanical properties and failure modes of satin weave E-glass/epoxy composite laminates [45/−45/0/90]_ns. Two types of E-glass fabric/epoxy pre-impregnated tapes were used to manufacture the composite laminates specimens. The low strain rate tests were conducted with an INSTRON™ testing machine, and the high strain rate tests done using a pulse shape modified compressive Split Hopkinson Pressure Bar apparatus. From the experimental result, it was concluded that under different strain rate loading, compressive strength, modulus, and strain at peak stress were rate sensitive. Optical and microscopic photos of the specimens were taken to determine operative failure modes. Within the studied strain rate regimes, the failure mode changed from splitting followed by fiber kink buckling to predominantly delamination and shear fracture as strain rate increases from quasi-static to high strain rates. Compressive properties and failure modes were severely affected by strain rate, stacking sequence, and fabric material. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers