Study on the regulation mechanism of interfacial mechanical properties of carbon fiber reinforced aluminum foam sandwich interface

Carbon fiber (CF) is often used to enhance the interfacial properties of porous metal sandwich panel, however, the regulation mechanism on the mechanical properties of the reinforced interface is not clear, which affects its guidance in application. In this study, the regulation mechanism of CF on the mechanical properties of aluminum foam sandwich (AFS) interface was studied from the perspectives of morphology and chemistry. Results showed the effects of CF modification time, modification temperature and content on the interface properties were synergistic. The interfacial strength increased and decreased afterwards as the modification time or temperature or content increased. Fibers aggregation caused by excessive fiber addition could decrease the interface strength. Self-locking and fiber bridging were the dominant reinforced modes and their effects increased as appropriate addition content increased. Guided by the results, the shear strength of AFS interface increased by 79.18%, the energy absorption increased by more than four times.