Shape prediction of bistable plates based on Timoshenko and Ashwell theories

This work is concerned with the geometrical characterisation of bistable composite plates in order to investigate their curvatures interdependence. The main non linear feature of bistable asymmetric laminates concerns large deflection with small energy input. This is an aspect of particular interest for several applications. Accordingly, there is an increasing importance placed on accuracy/sensitivity of predicting techniques to model bistable deformation shapes. This paper presents a novel forecast model to map the surface profiles of bistable laminates. By Timoshenko and Ashwell approaches, an analytical model is developed to provide an interpretation of the bistable shapes, in terms of principal and anticlastic curvatures. The experimental data (via laser acquisitions), with analytical and Finite Element models, help to understand the relation between material properties, plate dimensions, stacking sequence, curing features of the composite laminates and the bistability phenomenon.