Abstract
The sandwich panel is extensively utilized in various protective structures due to its exceptional load-bearing capacity and blast resistance. In this study, a nonlinear finite element (FE) model is developed to examine the explosive impact behavior of sandwich panels featuring carbon fiber reinforced aluminum laminates (CRALL) skins and aluminum honeycomb core. Utilizing the 3D Hashin criterion and accounting for the strain rate effects on composite plies, the user subroutine, VUMAT, is employed to predict the damage response in composite layers. The Johnson–Cook model and bilinear traction–separation model are used to describe the dynamic responses of the metal layers and the inter-laminar delamination phenomena. The established FE model is validated against existing experimental data in ballistic impact conditions and subsequently employed to predict the explosive impact behavior of the sandwich panel. The dynamic response and damage mechanisms of the sandwich panel under blast impact, fragments impact, and combined impact loading are analyzed. Additionally, the effects of blast mass and impact angle on the explosive impact behavior of the sandwich panel are discussed in detail.
Published Version
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