Development of Finite Strain Shell Elements for Multi-Layered Fiber-Reinforced Materials Applied for Non-Rigid Parts Deformation during Assembly Process

Abstract

Non-rigid parts in assembly process may have different shapes in a free state compared to the designed (nominal) model due to geometric variations, gravity loads and residual stresses. This may make the assembly process difficult, even impossible. For multi-layered fiberreinforced composite non-rigid parts, it becomes much more complex. Therefore, studying the material behavior of fiber-reinforced non-rigid parts during an assembly process is very important. This paper describes the development of a constitutive model for fiber-reinforced materials. An anisotropic hyperelastic material model with a polyconvex strain energy function was investigated and implemented in Abaqus as a user-defined material used with finite strain shell elements. An inverse characterization method was applied to identify the parameters of this material model based on experimental measurements.