Experimental Study And Theoretical Analysis On The Dynamic Properties Of Foamed Aluminum Alloys

Metal foams used as energy absorption or impact protection devices are often subjected to impact loads, so understanding the dynamic properties and strain rate sensitivities of metal foams are attracting more eyes. Investigating on what and how their dynamic behaviors are influenced is of practical meaning to the application of metal foams. In this paper the mechanical behavior and deformation characters of aluminum alloy foams under high strain rate compression are studied systematically with SHPB device, combined with theoretical analysis and numerical modeling method. The researches are outlined as following:1. Factors influencing the dynamic properties and energy absorption capacities of metal foamsThe effects of base material's property and cell structure (mainly the cell size) are studied. Following results are found in experiments: (1) Different metal foams exhibit different sensitivity to same strain rate increase even when they have same cell structure and cell size. The maximum of energy absorption efficiency of aluminum alloy foams is not sensitive to strain rate change. Although the energy absorbed by unit volume foam is sensitive to strain rate change, it has weak relation with the material by which the foam is made from. (2)Foams made of ductile material deform...