Resonant Frequency Eddy Current Liftoff Measurements for Shot Peening Intensity Assessment in Materials

Abstract

Conductivity profile determination by eddy current for shot-peened superalloy surfaces toward residual stress assessment ABSTRACT. The shot peening intensity of nickel base materials has been examined with an innovative eddy current measurement. The goal is to provide a nondestructive tool to quantitatively evaluate the surface conditions after shot peening. Traditionally, the residual stress caused by the shot peening process can be examined by X-ray diffraction. Recent eddy current works have shown promising results in evaluating the small conductivity variation due to the residual stress. This study explores the feasibility of utilizing the cable which connects to a network analyzer and a conventional eddy current probe to monitor the surface conditions due to the shot peening.

Eddy Current Testing Technique to Detect Imperfection Surface for Different Lift-off Value on Copper Metal

“…In result, this design makes a signal response varied by the LO effect but less sensitivity of defect detection that used an absolute coil or single test coil. Another study on LO frequency by [5] design the eddy current measurement using the LO curve and using the cable that connects to a network analyser and a conventional eddy current probe instead of improving the design of the test coil to monitor the shot peening surface conditions. Howbeit, this design only focused on measuring of material property and detect the condition of surface material tested that was less considering on defect detection.…”