A progressive intraply material deterioration and delamination based failure model for the crashworthiness of fabric composite corrugated beam: Parameter sensitivity analysis

A high-accuracy progressive failure model based on continuum damage mechanics (CDM) is proposed to simulate the quasi-static axial crushing of composite corrugated beam. To predict various physical phenomena, both of the intra-ply damage and inter-ply interface damage are considered. The damages of intra-ply fiber and matrix are initiated with stress failure criteria and progressive damage propagation is modeled with a stiffness discount method and energy criteria. The deformation gradient algorithm is effectively used for the erosion of failure elements. Further, the delamination damage is predicted by a triangle traction-separation model with a mix-mode fracture energy criterion. To obtain insights into complicated failure mechanisms, a parameter sensitivity study is carried out to study effects of numerical parameters on failure responses, including element erosions, failure strengths, elasticity modulus, friction properties, etc. Results show that the established model correlates well with experiment on failure modes, impact loads and energy-absorbing characteristics. It is found that element erosion parameters are the most influential parameters for impact loads. The fiber compression strength and friction coefficients exhibit dramatic effect on energy-absorbing capability and failure modes of specimen.