炭化ケイ素粒子強化アルミニウム合金切欠材における疲労き裂伝ぱに関する研究

概要

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The initiation and propagation behavior of short fatigue cracks emanating from a sharp notch in an aluminum alloy (2024-T6) reinforced with 20 volume percent of SiC particles was investigated. The development of crack closure with crack propagation was measured through the compliance method. The propagation rate, dc/dN, of short cracks was higher than that predicted using the dc/dV-ΔK relation for long cracks. For the case of a low stress amplitude, the propagation of short cracks decelerated and finally stopped. The relationship between dc/dN and the effective stress intensity range, ΔK_<eff>, for short cracks at notches was identical to that obtained for long cracks. The relationship between dc/dN and ΔK_<eff>/E(E=Young's modulus) was nearly identical for short and long cracks in reinforced and unreinforced alloys. The roughness of the fatigue fracture surface was determined using a computer image processing method. The roughness of the fracture surface of composites was larger than that of unreinforced aluminum alloy.
社団法人日本機械学会の論文
1994-05-25