Author(s)

Y. Akiniwa & K. Tanaka

Abstract

Evaluation of fatigue damage in Sic particulate reinforced aluminum alloy by X-ray Y. Akiniwa & K. Tanaka Department of Mechanical Engineering, Nagoya University, Japan Abstract Smooth specimens of an aluminum alloy 2024-T6 reinforced with 20 volume percent of silicon carbide particles (SiCp) were fatigued under four-point bending. The X-ray diffraction method was applied to measure the loading and residual stresses in each constituent phase. The phase stresses were determined from the diffractions of A1 222 and Sic 116. The compressive residual stress in the aluminum alloy phase increased with increasing stress cycles. For the Sic phase, when the ratio of the number of stress cycles to fatigue life, N/Nf, was larger than about 0.04, the compressive residual stress increased with stress cycles. The half value breadth increased with the number of stress cycles before final fracture. Differences between the phase stresses measured at the maximum and zero loads was examined during fatigue. The ch

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