Observations of fatigue damage development in woven glass fiber-reinforced polymer composite using transmission light photography technique

Fatigue behaviour is an important aspect for consideration while handling glass fiber-reinforced polymer (GFRP) composites. A combination of (0°/90°) and (±45°) plies are gaining practical interest in engineering applications due to their excellent mechanical properties. Properties individual above-stated primarily influence the laminates. on-axis off-axis fiber orientated woven GFRP laminates was investigated. Tensile tension-tension fatigue tests were performed on prepared test coupons according ASTM standard. conducted until failure at maximum applied stress 90%, 70%, 50% respective ultimate strength. Damage growth monitored term debond zones by employing transmission light photography technique. Testing process recorded using a digital camera. The results established terms stress-strain curve, Wöhler dynamic stiffness. strength much lower than Global damage has occurred laminate witnessed localized damage. At higher levels, samples failed shorter lifespan with aggressive damage; however, specimens survived longer life.