Method for strength prediction of unidirectional composites based on unit cell analytic model

Based on the unit cell analytic model, a method to predict the strength of unidirectional composites is developed from the micro component of composites. The micro-macro correlation matrix is presented according to the continuum mechanics and homogenization method. The elastic and damage properties of the component phases are passed to unidirectional composites by the micro-macro correlation matrix. Considering the micro damage of component phases, failure arises in the fiber and matrix, when the strength criteria are satisfied. Once the component phases have failed, the stiffness is degraded by the failure factor. On this basis, the simulation of unidirectional composites in the longitudinal and transverse tensilon is achieved to predict the tensile strength of unidirectional composites by combining with finite element analysis. Numerical results show that the predicted modulus and strength of the method in this paper are well fit with experimental results and the strength prediction method for composites is of validity and efficiency.