In order to solve the technical difficulty of operating multiscale simulation on the braided composites of highly complicated mesoscopic structure

a multiscale damage simulation method based on 3D general method of cells(GMC) model was developed. Based on the basic theory of the GMC method

the conversion formula of macroscopic and mesoscopic parameters was derived

and the iterative process of macroscopic and mesoscopic damage increment steps was developed. Taking the 2D plain weave ceramic matrix composite as an example

the mesoscopic damage simulation on the unit cell was examined and the multi-scale damage simulation on the flat test piece of the 2D plain weave composites was performed. The mesoscopic damage contours and macroscopic stress-strain curve were obtained. The research revealed that the unit cell mesoscopic damage process simulated by the method agreed with the damage mechanism described in the related literatures. The predicted stress-strain curve during the damage process of the flat test specimen was consistent with the test results

and the relative error of the predicted intensity value was less than 5%.