Low-Velocity Impact Analysis of a Stiffened Composite Panel

Abstract

The layered architecture of composite material allows for designing light-weight structural components. However, one of the challenges associated with composite structures is design and analysis considering impact damage. Although the damage associated with high-velocity impact events is often readily observed in a structure, by loss of material, for example, low-velocity impact damage is not always visible. However, low-velocity impact damage can undermine the strength capacity of a composite component. To ensure the structural integrity of components, predicting the residual strength after impact damage is critical. In this paper, a methodology for analysis of low-velocity impact on a curved composite panel is discussed. First, impact analysis of the panel utilizing Abaqus\Explicit is presented. A metallic projectile is utilized to simulate a tool drop event. Thereafter, a simulation technique for predicting the residual strength of the panel is discussed. The residual strength is measured in terms of collapse load when the panel is subjected to axial compression. Finally, parameter sensitivity analysis is performed to understand the influence of the various design parameters on the residual strength of the component after impact. This procedure requires automating the entire simulation workflow. The results of the simulation are presented along with the important observations.

A novel model of Z-pin insertion in prepreg based on fracture mechanics

“…However, they are prone to delaminate when loaded perpendicular to the laminate main plane, leading to performance degradation and structural failure. 1,2 The development of through-thickness reinforcement in the form of Z-pinning, stitching, or 3D weaving can solve the problems. 3 Z-pinning is to insert solid rods with a certain volume density in the thickness direction of composite laminates.…”