Neil Goldfine, Vladimir Zilberstein, Darrell Schlicker, Ian Shay, Andrew Washabaugh, David Grundy, Robert Lyons, Chris Craven
JENTEK Sensors, Inc., 110-1 Clematis Avenue, Waltham, MA 02453-7013
Ph: 781-642-9666, Fax: 781-642-7525, Email: jentek@shore.net
Abstract
Characterization of shot peening quality or service-related changes of the shot peened regions directly on shot peened components can have a profound effect on the quality control and rework practices as well as on design philosophy. This presentation describes nondestructive methods for measuring shot peen intensity either at selected locations or over entire shot peen regions directly on complex-shape components. Some of these methods are currently available, while others are in a development stage. One such method is based on using conformable eddy current sensors known as MWM (Meandering Winding Magnetometer) sensors or scanning MWM-Arrays. These sensors can characterize shot peening intensity and coverage. They can also map residual stresses for steels and nickel alloys, monitor stress relaxation, and detect cracks at shot peened surfaces. These capabilities are enabled by the unique design of the sensors that permits measurement of electrical conductivity and/or magnetic permeability, affected layer thickness and surface roughness (patents issued and pending). The sensors, instrumentation and software for these applications are available and can be used for characterization of aluminum alloy components as well as other nonferrous alloy, e.g., magnesium alloy components. Ongoing effort is focused on applications for shot peened steel components.
Revised 8/13/04
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