Twisting control strategy of bistable composite shell with initial curvature

Abstract

Bi-stable composite shells with initial curvature have obtained much attention due to their lightweight and morphing. The twisting deformation after curing is induced by thermal residual stress generated during the manufacture of the bistable composite shells, which has a significant influence on the mechanical behavior and the cured shape of bistable composite shells with initial curvature. This paper put forward a method to control the twisting by introducing an adjustive angle. An analytical model is developed to capture the suit adjustive angle, which makes the bistable composite shells without twisting. The analytical predictions are verified by results based on the experiments and finite element results. Moreover, the effect of initial radius, ply angle, thermal expansion coefficients, and elasticity modulus on an adjustive angle is considered by the analytical model, which can provide a guide for designing the bistable composite structures without twisting. The curvatures after twisting control are provided to predict the configuration of bistable composite shells with initial curvature.