Study on the Effects of Shot Peening on the Residual Stress in A1-siC Composite

Author:  J. Lu, B. Miege and J. Flavenot
Source:  Conf Proc: ICSP-4, (p.169-178)
Doc ID:  1990081
Year of Publication:  1990
Silicon carbide whiskers and particulates reinforced aluminium alloys show promise as metal matrix composites stiff and high-strength light-weight applications. The magnitude of the residual stress have a very important effect on the yield stress and fatigue strength of the metal matrix composite. Many techniques are available for residual stress measurement on mechanical parts. X-ray diffraction, bending deflection and hole drilling are three techniques which are commonly used. This paper shows a study on the measurement of residual stress on the MMC components by the incremental hole drilling method and the X-ray diffraction method. The modified hole drilling method is used for measuring the macroscopic residual stress gradient in depth and the X-ray method is applied to study the surface residual stresses in the matrix. Different aluminium matrices (2124, 6061) and different SiC fiber proportions have been tested. The effects of shot-peened treatment on the residual stress distribution of these materials will be analysed and compared. Comparison between measurement with the X-ray diffraction method and the incremental hole drilling method will also be shown. Descriptors: Residual stresses; Metal matrix composite; X-ray method; Hole drilling method; 2124; 6061; Shot peening; Machining; Volume fraction; Triaxial state stress

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