An approach to design high-performance unidirectional CFRPs based on a new sensitivity analysis model

Abstract The modification of the material parameters (MPs) of different types of fibers and matrices is an important task when designing high-performance unidirectional carbon fiber reinforced plastics (UD-CFRPs). The focus of this study is the computational analysis of the MPs variability, as well as deterministic sensitivity of fiber and matrix to design new types of high-performance UD-CFRPs. The prediction model of the mechanical properties of higher precision UD-CFRPs is established based on a cross-scale finite element (FE) method, while the experimental results make clear that the prediction models are in good agreement. Modeling and solving the sensitivity analysis model of the MPs of fiber and matrix are carried out entirely in MATLAB using the input and result sample set. A method of the variable parameter amplitude is first proposed to verify the sensitivity indices. Simultaneously, different types of high-performance UD-CFRPs are designed based on the sensitivity analysis model. In addition, the MPs of UD-CFRPs are verified using the cross-scale FE prediction model, and the verification results indicate that the proposed design approach is accurate and efficient. This study shows the most influential MPs of fiber and matrix, which contribute to the design of higher-performance UD-CFRPs.