Numerical investigations were conducted on the mixing efficiency of resonant acoustic mixing (RAM) technology using a high-viscosity mixture under vertically forced vibrations. The density distribution was analyzed for a mixture of high-melting explosive (HMX) and trinitrotoluene (TNT). The effects of mixing time, amplitude, frequency, fill level, and mixing vessel geometry were evaluated to determine their influence on the blend homogeneity and the efficiency of the mixing process. The results showed that amplitude and frequency both have significant influences on the mixing efficiency of the RAM process. With higher values of amplitude and frequency, the mixing efficiency was very good, and uniform mixing was achieved in a much shorter time. At the same time, it was seen that geometric changes did not affect the mixing process; in contrast, varying the fill level did have a significant effect. This approach could potentially be used for pharmaceutical blending, cosmetics, and explosive applications, where only small quantities of active particle ingredients (APIs) can change the behavior of the mixture.

A novel polymethacrylimide foam-filled square carbon fiber reinforced composite honeycomb core was proposed and prepared. Numerical simulations and theoretical predictions were conducted to study the quasi-static compressive strength of the hybrid core. The effects of material and structural parameters on the compressive strength of the core were analyzed. The results show that the failure modes of the core under quasi-static compression include elastic buckling and plastic fracture failure. The change law of the compressive strength of the core with the increase in the relative density can be divided into three phases, including post-buckling load bearing stage, buckling failure stage, and fracture stage. The failure modes of the core and the change law of the compressive strength with the increase of the relative density vary with the material and structural parameters. The research provides an accurate method to predict the compressive strength of the foam-filled composite honeycomb, which can help to guide the design and optimization of light weight and energy-efficient sandwich cores.

The stuffed corrugated sandwich structure was proposed for the application in the protection of the spacecraft against orbital debris. In order to investigate the protection properties of the stuffed corrugated sandwich structure under hypervelocity impact, numerical simulations were carried out to analyze the impact characteristics. The hypervelocity impact process was presented and the properties such as shock waves propagation, energy absorption, and expansion of the debris cloud were discussed; corresponding properties of mass equal Whipple structure under impact were analyzed for comparison. The results illustrate the protection mechanism of the stuffed corrugated sandwich subject to hypervelocity impact and show that it has superior protection performance to monolithic plate, which prove that the stuffed corrugated sandwich structure has potentially broad application prospect in the field of spacecraft protection against the orbital debris. The research can provide reference for the design of protection shield of the spacecraft.