Abstract
This paper reports on an on‐going project toward developing electromagnetic residual‐stress characterization method. Specifically, we present recent work on an eddy current technique and model‐based inversion method, specific to nickel‐based superalloys. In our approach, we treat residual stress measurements essentially as a “layer‐substrate” problem (a shot‐peened layer on an alloy substrate), to which the swept‐frequency EC technique is applicable. To this end, a high‐sensitivity eddy current system with operating frequency up to 50MHz has been recently developed and validated. We present a description of our instrumentation that includes proprietary probes fabricated by the PCB technology, and laboratory‐grade instruments under software control. The paper also describes the experimental procedure for performance studies, supported by preliminary data that distinguish clearly between surfaces before and after shot‐peening for nickel‐based alloys. In addition, we present forward and inverse model validat...
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