Computational modelling and prediction of elasto-plastic constitutive behaviour of damaged polymeric structure under high-strain loadings.

The influences of variable damages (crack and delamination) and high-strain loading conditions on the elasto-plastic stress–strain characteristics of fiber-reinforced polymeric composite have been evaluated in this research. The desired constitutive behaviour is obtained using the advent of material modelling features of a unanimously accepted commercial finite element (FE) tool (ABAQUS). The effect of damages (individual/combined) is obtained through a Quad element to analyze different specimens considering various strain rate loading (0.001, 0.01, 0.1, 1, 10, 50). The model validity has been established initially by verifying the outcomes (stress–strain data) with those of the open domain results. Furthermore, the relevant mechanical forces and stress–strain characteristics are computed for several new cases of polymeric composite samples by varying the geometry, damages, and testing conditions (strain-rate loading). Additionally, the sensitivity analysis is carried out based on surrogate models (i.e., stochastic constitutive models) to quantify the influence of damages in presence of strain rate. The comprehensive features and the model capabilities are summarized in detail for the variable geometrical configurations. [ABSTRACT FROM AUTHOR]