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Title: Instrument For Nondestructive Measurements of Stress Depth Profiles in Shot Peened Aluminum Alloys
Author: K J Kozaczek, P R Moran, D S Kurtz, R Martin
Source: Conf Proc: ICSP-7 (pg 313-320)
Publication year 1999
Document number: 1999043
Number of pages: 8
Abstract:
Controlled surface compressive stresses are often applied to critical structural materials to improve the fatigue properties by reducing the probability of crack initiation
and propogation. Techniques such as shot peening, water jet peening, laser shock peening, cold working, and roll burnishing are commonly employed to impart the comrpessive
stresses. We evaluated the feasibility of using diffraction of short wavelength radiation (deep penetrating) for evaluating average subsurface stresses in aluminum alloys
shot peened to different levels of deformation. A new technique has been developed, which determines the average stress nondestructively in the range of 0-300 µm below the
surface. The method is capable of measuring the complete stress tensor. We evaluated the method by comparing the measured average stresses with other techniques; X-ray
diffraction using a shallow penetrating Cr radiation combined with material removal by electropolishing, neutron diffraction, and modeling. Based on this technique, an
instrument has been built capable of nondestructive stress measurements in the subsurface regions. The instrument uses a CCD based fiber-optic detector developed at
Hypernex.
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