Effects of polymethacrylimide foam reinforced aluminum honeycomb sandwich under quasi‐static compression

Abstract

In this study, aluminum honeycomb cells were filled with polymethacrylimide (PMI) foam of high strength and stiffness, and carbon fiber reinforced composite (CFRC) skins were added to create a composite sandwich structure. Nine types of specimens with varying cell node spacing and foam density were constructed, and stiffness equations were derived. To compare the performances of aluminum honeycomb and PMI foam sandwich structures, their compressive responses were examined using edgewise and flatwise compression tests. Moreover, the failure was analyzed using finite element methods (FEM). Analytical and numerical models were used to investigate the size effects of rib width, rib angle, and node spacing.

Preparation, testing, and design of a radar‐absorption polymethacrylimide foam

“…They also exhibit excellent thermal insulation, 12 fatigue resistance, 13 and high adhesive performance. 14 Therefore, PMI foams have wider engineering applications and potential than all other polymer foams. However, PMI foam transmits electromagnetic waves (EMWs).…”