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Undesirable vibrations can greatly degrade the accuracy of phase shifting moiré interferometry. Although moiré interferometry is always equipped with a somehow elaborate system to dampen or to eliminate vibration, such as granite slab and air table, it is common to see the phase fluctuation of moiré diagram attributable to the various vibration during the measurement process. The sensitivity of moiré...
Residual stress measurement has significant practical implications in the service, security and reliability of components. The hole-drilling method is one of the most popular techniques used to measure residual stress. With hole drilling calibration matrices, it is possible to deduce the variation in stress with depth by incrementally deepening the hole. Calibration matrices for each type rosette...
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