Reliability analysis of angle ply woven GFRP composite under in-plane loading condition using two parameter Weibull distribution

This study presents an analysis of the reliability of woven angle ply GFRP under both static and dynamic loading conditions. Hand lay-up technique was used to fabricate 8-ply laminates with four different fibre orientations (0°/90°, ±15°, ±30°, and ± 45°). The laminates were then tested for their tensile properties and fatigue behavior. When compared to specimens reinforced with different fibre orientations, specimens with (0°/90°) fibre orientation showed the highest failure stress and lowest failure strain. Theoretical model based on the Weibull distribution has been employed to determine theoretical tensile strength and mean fatigue life values for prepared laminates. Weibull parameters were used to generate S-N curves for various reliability levels (R = 0.10, 0.368, 0.50, and 0.99). The variation in the experimental results was investigated using the Weibull distribution function's shape factor (α) and coefficient of variance. These S-N curves were developed to assist designers in determining the first failure time as well as reliability and safety constraints. Finally, the study showed that the scatter value in all sample groups decreased to a failure criterion of approximately 106 cycles, and the scatter values were closer to each other.