アルミニウム合金複合材料の疲労き裂進展特性に及ぼすSiC粒子の影響

概要

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The influence of SiC particles on fatigue crack propagation (FCP) in SiC particles/6061 aluminum alloy composite was studied. The main results were as follows. (1) In the IIa region of a FCP diagram and at the threshold value ΔK_th, the FCP property was controlled by ΔK (the effect of cyclic loading). (2) In the IIb region of the FCP diagram, the FCP property was controlled by K_max (monotonic maximum loading). (3) In the IIa region of the FCP diagram, the fatigue crack went around SiC particles and through an aluminum matrix. Then, the threshold value ΔK_th became equal to the value of ΔK under which the dimensions of cyclic plastic zone at the crack tip were the size of SiC particles. (4) In the IIb region of the FCP diagram, FCP was accelerated by SiC particle cracking which was a brittle-like monotonic fracture.
一般社団法人日本機械学会の論文
1996-04-25