A polarized-light study of glass-fibre laminates

Abstract

The use of a stress sensitive resin (Marco 28C) in the formation of a glass-fibre-resin laminate makes possible a photoelastic stress analysis of a highly anisotropic material. This will have an application in conjunction with theoretical stress analysis in anisotropic materials; it is hoped that it will also be of value to the designer of reinforced plastic structures. The relation between the resin and the fibres in a laminate under load has been studied with the aid of a polarizing microscope. A disconcerting feature is the discovery of a pattern of cracks which open under relatively small stress, and which may provide a pathway for erosion by water. Show more