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Edition:Final report Jul 1993-Nov 1995
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Abstract:A new approach to the measurement of residual stresses in railroad wheels is investigated using a saw cut method of releasing stresses in the structure. High-sensitivity moire interferometry combined with Michelson interferometry provides full-field information about distribution of displacements around a saw cut notch on both flat surfaces of the rim of a wheel. The precision of the measurements is better than 100nm. Additional discrete gages provide information about the absolute displacements of the points on the rim with respect to the center of the wheel and strains in selected locations.
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