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.

ATHEER RAHEEM ABDULLAH

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