Influence of the average stress in a unidirectional glass-epoxi composite material subjected to off-axis cyclic loads

Abstract

A fatigue theoretical model for continuous glass-fibrereinforced epoxy composite material under general loadconditions was developed in previous works based onthe principal fatigue failure modes and on local failurecriteria. It was demonstrated that fatigue life dependedon the cyclic shear stress and the maximum stress transverseto the crack growth direction. Following the previousmodel, this work analyzes the influence of the averageapplied stress on the fatigue life of the material.

Keywords

• composite
• fibre reinforcement
• glass
• polimer
• fatigue