The Shock Wave Attenuation And Anti-detonation Property Of Aluminum Foam

Open cell metallic foams are relatively new materials that are being used increasingly in a range of applications due to their attractive combinations of physical, chemical, mechanical and optical properties. Highly metal foams with low impedance generally have an excellent shock attenuating capacity. They have found applications in a number of fields as an excellent impact protection material. For these reasons, the dynamic compressive behavior and the energy absorption characteristics of aluminum foams have become one of the most attractive topics in mechanics and materials sciences.Firstly the influence of cell size and matrix on aluminum foams is investigated. The effect of cell size depends on the matrix of aluminum foam. As for pure aluminum foam, there is neglected effect of cell size on the strength and plastic modulus. The stress rises slowly with the increase of strain in the collapse region of ductile metal foams. The collapse region of brittle metal foams is wide and even. The energy absorption of brittle metal foams is better than ductile metal foams.The shock wave attenuate rapidly as it propagates in the aluminum foam and the peak stress follows an exponential attenuation relation with the thickness of the foams under explosion. The different materials including aluminum foams applied on the protective structure is investigated. The results show that aluminum foams can attenuate the shock waves effectively. Aluminum foams can reduce the velocity of the structure and attenuate the peak of shock waves if it is placed at bottom or as sandwich.The deformation of aluminum foams under explosion load can not be resumed while the polymer foams deforms with some resumed strain, so the latter foams prolong the duration of over pressure, attenuate less over pressure impulse.The shock wave attenuation in the aluminum foams is simulated by LS-DYNA. The aluminum foams deform from the top to the bottom under explosion load, which is different with the uniform deformation under quasi static loading and dynamic loading. The simulation results show that aluminum foams can attenuate the over...