Effect of Fabrication Defects on Elastic and Fatigue Properties of Carbon Fiber Reinforced Polymer Composite

This chapter delves into the effects of fabrication defects, specifically voids, on the elastic and fatigue properties of carbon fiber-reinforced polymer (CFRP) composites. The study employs various experimental and computational methods, including micro-CT and SEM, to analyze void characteristics such as shape, size, position, and distribution. The research focuses on how these voids influence the mechanical properties and fatigue life of CFRPs, particularly in quasi-isotropic laminates and cross-ply carbon/epoxy laminates. The findings reveal that voids significantly impact the initial stages of cracking and overall fatigue performance. The study also explores the manufacturing process, detailing the vacuum-bagging resin infusion microwave curing (VBRIMC) method used to create CFRP composites with different void volume fractions. Tensile and fatigue tests were conducted to evaluate the ultimate tensile strength, elastic modulus, and fatigue life of the composites. The results indicate that higher void volume fractions lead to reduced ultimate tensile strength and elastic modulus, as well as decreased fatigue life. The chapter concludes with a comprehensive analysis of the void volume fractions and their impact on the mechanical properties of CFRPs, providing valuable insights for professionals in the aerospace, automotive, and marine industries.