Alternating current potential drop and eddy current methods for nondestructive evaluation of case depth

Abstract

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Electromagnetic methods for measuring material properties of cylindrical rods and array probes for rapid flaw inspection

“…Figure 2.4 can be used to discriminate the outer layer depth by fitting frequency scan experimental data with the theoretical predictions. For coils encircling a long layered rod, the model in [43] has been applied in Appendix A and reference [33]to evaluate case depth of case hardened steel rods. However, in order to take measurements on short steel rods, end effects should be considered.…”

“…New samples are ordered with known hardness profile. A complete discussion of the updated system and more results are given in Appendix B and reference [33].…”

“…The ACPD measurements for case-hardened steel rods can be found in Appendix B and reference [33]. used to toggle between the two measurements.…”

“…The experimental data in Figure 1.10 were recorded manually. After these initial measurement were taken, the system was controlled automatically as in the Appendix B and in reference [33], more data were collected over a wider frequency raztge.…”

“…However, they were performed using an automated system as described in the Ap pendix B and reference [33].…”