Analysis and prediction of interlayer stress and strain of composites such as CFRP irradiated by laser

Abstract

In order to further reveal the interaction mechanism between laser and composites such as carbon fiber reinforced plastics (CFRP), this paper proposed, constructed, and verified a finite element method (FEM) for accurately analyze and predict the interlayer thermal stress and strain of CFRP through numerical simulation. Firstly, the FEM was constructed based on the theoretical analysis of the temperature, stress-strain distribution in CFRP composites irradiated by laser, which is consistent with the experimental conditions. Then, the accuracy of FEM was verified through experiments. Finally, the verified FEM was successfully extended to a more general and complex situation. This method can not only highly restore the arbitrary CFRP interlayer and directional stress in complex conditions such as different laying modes, different material ratios, and different fixed constraints, but also predict the strain trend of materials. Simultaneously, it can also make an accurate quantitative analysis of the thickness-stress distribution at any point in it. All these are difficult to achieve by current methods, so the proposal of this method can effectively fill up the gap in the current research on this issue, and will undoubtedly have significant reference value and universal guiding significance for future research.