Failure analysis of unidirectional CFRP composites with the coupled effects of initial fibre waviness and voids under longitudinal compression

• DOI: 10.1016/j.compstruct.2024.118451
• Publication Date: 2024-08-05T17:41:23Z
• Authors: Jiayun Chen; Lei Wan; Katherine Nelms; Giuliano Allegri; Dongmin Yang
• Keywords: Waviness

This research delves into the failure mechanisms exhibited by unidirectional Carbon Fiber Reinforced Polymer (CFRP) composites under longitudinal compression, while considering interplay of three types manufacturing-induced defects: initial waviness fibres, void volume fraction, and size. The study employs 3D high-fidelity intact representative element (RVE) models, incorporating fibres voids based on Micro-CT imaging. A novel algorithm is proposed to generate more accurate shapes, departing from conventional circular or triangular approximations. results highlight substantial influence angle reduction predicted compressive stiffness strength. size play a significant role in determining damage initiation within composites. composite coupled effects are discussed, exhibiting reasonable agreement with experimental observations.