On the transverse cracking and longitudinal splitting behaviour of glass and carbon fibre reinforced epoxy cross ply laminates and the effect of Poisson and thermally generated strain

90° cross ply epoxy resin laminates reinforced with either glass or carbon fibres were tested in tension as a function of ply thickness. Transverse cracking of the 90° plies and longitudinal splitting of the 0° plies has been observed and the experimental strains recorded. Energetics arguments have been presented which explain this behaviour and permit experimental ply cracking strains to be estimated. The effects of thermal strains generated...