Comparison of Residual Stress Measurements Using X-Ray Diffraction and PRISM - Electronic Speckle Pattern Interferometry and Hole-Drilling

PRISM determines residual stress using the hole drilling technique and laser interferometry. The stress relief brought about is measured in the form of surface displacements by digital photography of speckle patterns before and after drilling. This method is much quicker and easier-to-use than strain-gage methods. The paper introduces the measurement system and discusses depth profiles obtained from different materials and their correlation with x-ray diffraction results.