Effect of Reinforcement Content on Damping Capacities for Castable Aluminum Matrix Composites Reinforced with SiC and Graphite Particles

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Journal of the Korea Institute of Military Science and Technology 2004;7(1):47-58.

SiC와 흑연 입자 강화 주조용 Al기지 복합재료의 진동감쇠능에 미치는 강화입자조성의 효과

최유송

국방과학연구소

Abstract

Loss factors of A356, Mn-Cu alloy and aluminum matrix composites reinforced with $SiC_p$ and Ni-coated graphite particles at various contents have been investigated using clamped-free cantilever beam method. The loss factors of half-power bandwidth of the specimens were measured over a wide range of frequencies from 50 to 3300Hz. Among the specimens, Al-10%$SiC_p$-10%$C_p$ showed the highest loss factor at the mode I, while Mn-Cu alloy showed the highest loss factors at the modes II and III. Consequently, at the mode I the Al-10%$SiC_p$--10%$C_p$ showed the loss factor of 0.00093, which is 2.64 and 1.58 times higher than those of A356 and Mn-Cu alloy, respectively.

Key Words: Damping, MMC, Aluminum, Silicon carbide(SiC), Graphite, Casting, Nickel