Anti-impact protective structure design for a missile accelerometer recorder

For an environment of projectile's penetrating concrete, an anti-impact protective structure for a recorder was proposed, it was a medium-thin protection outer shell with an inner shell embedded and aluminum foam filled between two shells. For the protection outer shell's buckling under stress wave and the typical failure modes of an inner circuit module fracture caused by shortage of aluminum foam's buffer performance, the structural response of a recorder anti-impact protective structure was analyzed under stress wave, the design method for a missile acceleration recorder protective structure was presented, it took shell thickness h, aluminum foam density ρ, and aluminum foam thickness h_b as the main design parameters. A recorder protection outer shell was designed with radius of 29 mm, thickness of 3 mm, aluminum foam density of 1.1 g/cm³ and aluminum foam thickness of 23 mm, its anti-impact ability was calculated to be 63300 g. In a test of a projectile's penetrating concrete, the peak impact acceleration was 56300 g. It was shown that the recorder shell structure is stabile under impact and its inner circuit works properly under impact, so this anti-impact protective structure designed with the proposed method has a higher reliability.