SiC粒子強化複合材料の微小き裂の発生および進展挙動に及ぼすSiC粒子の影響(<小特集>先進材料と信頼性解析・評価)

概要

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The effect of silicon carbide (SiC) on small fatigue crack initiation and propagation behavior of A6061-T6 metal matrix composites reinforced with 20 vol. % or 30 vol. % SiC particles of various diameters was investigated under axial cyclic loading at the stress ratio R of 0.1. The results obtained are summarized as follows. (1) The fatigue cracks of these composites initiate preferentially at the sharp end of a SiC particle in the matrix aluminum material, because the stress near the sharp end of a particle appears to be much higher than the average stress. (2) Small cracks exhibited much higher growth rates just after crack initiation, followed by a decrease in growth rate to a minimum value, which corresponded to that of a Stage I crack, and a monotonic increase with increasing ΔK. (3) The highest fatigue strength of the 20 vol. % SiC_p (mean diameter is 7 μm) composite was due to the excellent small crack growth resistance of this material.
一般社団法人日本機械学会の論文
1995-09-25