Development and Evaluation of Physically Based Fatigue Damage Model in Textile-Reinforced Plastics

Fiber-plastic composites are increasingly used in the aerospace, automotive, and wind energy industries, often exposed to multi-axial mechanical loads and high climatic stresses.The objective of this study is to investigate the fatigue behavior of these composites as a function of multi-axial mechanical stress by a novel developed degradation model based on continuum-damage-mechanical approaches.The model's simulation performance has been examined and demonstrated it is applicable in engineering practice.CFRC composites exhibit 74.5 MPa of tensile strength, but GF(MLG)/EP glass fiber reinforced composites demonstrate a considerable lack in both stiffness and regular deformation until ultimate failure.The failure of textile-reinforced plastic composites occurred in three stages of degradation.The tensile strength of biaxial NCF glass-reinforced polyester material was increased by 13 percent as well as the fatigue endurance by 20 percent as compared to the woven roving reinforced composites.The damage onset was 25-35% of the beginning stage.The structure then stabilized to 10-15% and then failed.In GF-MLG/EP, a pattern of stiffness change according to a direction was observed, where transverse cracks reduced the stiffness to 75% of its initial value after 10,000 cycles.Fatigue damage is more resistant in biaxial NCF composites than in woven fabric composites.