Abstract
Fatigue tests have been conducted to investigate the fatigue properties of glass fiber reinforced plastics, especially the effects of environmental temperature and volume content of glass fiber in the specimen.
The materials used were two kinds of F. R. P. laminate consisting of the same kind of matrix but different types of reinforcement, satin woven and plain woven fabrics.
Sufficient data have been obtained to produce the master diagrams for both types of laminate. The Goodman law and the Gerber law are being commonly used to clarify the relation between mean stress and stress amplitude. However, the results of our experiments show that these laws are not applicable for F. R. P. at higher testing temperatures than room temperature. Then, an empirical equation in the form of modified Gerber law showing the relationship between the mean stresses and the stress amplitudes at various lives is proposed.
