SiC_p/Al2024複合材料の疲労き裂発生および伝ぱ挙動に及ぼす予ひずみの影響

概要

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The effect of prestrain on the fatigue crack initiation and propagation behavior of an aluminum alloy(2024-T6)reinforced with 20 volume percent of Sic particles was investigated. Cracks were mainly nucleated in the matrix by prestrain of about 0.32% strain. The X-ray diffraction method was used to measure the change of residual stress in the SiC particles and in the matrix before and after prestrain. The residual stress changed from -134 to -107MPa in the SiC phase and from 0.6 to -12MPa in the matrix phase. Fatigue tests were conducted using a specially designed servo-hydraulic fatigue testing machine in a scanning electron microscope. The initiation and propagation behavior of small fatigue cracks in a smooth specimen was observed. Fatigue cracks were mainly nucleated from the matrix cracking and propagated in the matrix near the particles. When compared at the same maximum stress intensity factor, K_<max> the crack propagation rate, dc/dN, of the prestrained material was higher than that of the non-prestrained material because of the damage near the interface.
社団法人日本材料学会の論文
1998-03-15