Computational modeling of low-velocity impact response in long discontinuous fiber composite with statistical validation

Abstract

This study investigates the low-velocity impact (LVI) response of prepreg platelet molded composites (PPMC) with a stochastic meso-structure using finite element analysis (FEA) and an innovative approach for statistical validation. A finite element model was developed to simulate the dynamic response and progressive damage mechanisms in PPMC plates, incorporating meso-scale variability arising from random platelet orientation and arrangement. Functional analysis of variance (fANOVA) was employed as a novel method for statistically validating stochastic FEA results by comparing simulated and experimental responses. High-resolution imaging via X-ray computed tomography (μCT) and ultrasonic testing (UT) provided further validation by characterizing the spatial distribution and morphology of damage, including intra-platelet failure and inter-platelet delamination. The findings highlight the dominant role of inter-platelet delamination in energy dissipation and provide quantitative insights into the damage evolution process. This work provides a validated framework for modeling and analyzing PPMC impact behavior, offering insights for the design and optimization of discontinuous fiber composite systems.