Effects of Matrix Plastic Properties on Stress Transfer and Tensile Strength of Glass Fibre/Epoxy Resin Unidirectional Composite

摘要

The control of interfacial adhesion is an essential task for the perfection of fibre reinforced plastics and composite materials production technology. The proper adhesion of fibre and matrix can offer a balance of elastic and strength properties as well as fracture and failure characteristics for a composite. Fragmentation test of single fibre composite (SFC) is a main method to evaluate interfacial properties since the fibre stress state in SFC is somewhat similar to that in the real unidirectional (UD) composites. Furthermore, the micro-damage phenomena in SFC are also present in multi-fibre composites (i.e. fibre fracture, matrix cracking, interfacial debonding, friction, matrix yielding, etc.). Therefore, through the SFC test and tensile testing of UD composites, we could examine the relationship among the level of interfacial adhesion, micro-damage and ultimate tensile strength. Thus, the interface/interphase can be tailored for the optimisation of composite properties, especially to utilize fibre strength more efficiently.