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15 March 1998 Analysis of stress distributions in metal-matrix composites using computed tomography data
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The control of fiber spacing is a difficult challenge in the manufacturing of composite materials. This paper describes an analytical approach coupled with a nondestructive evaluation method to analyze the effects of fiber spacing on the material properties of a composite material. Results of a finite element analyses are presented to quantify the effects of fiber spacing in unidirectional metal-matrix composites. Computed tomography (CT) data of unidirectional metal-matrix composite samples provide information on fiber locations for the analysis of the fiber distribution within the composite. Image processing methods are developed to extract fiber centers form the CT data. The processed CT data are used to produce a rectangular grid of finite elements which model the composite cross-section and where the stiffness matrix for each element is based on the local fiber volume fraction. The finite element results how that in some cases, stresses in the composite can be as high as 56 percent greater than the average stress and thereby set up stress concentrations which can initiate yielding and/or damage at loads well below those that would be calculated using average stress considerations only.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert N. Yancey "Analysis of stress distributions in metal-matrix composites using computed tomography data", Proc. SPIE 3399, Process Control and Sensors for Manufacturing, (15 March 1998);

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