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Title: Standard Reference Materials For Eddy Current Nondestructive Evaluation: Research Material 8458
Author: F. R. Fickett, T. E. Capobianco
Source: 1990 Measurement Science Conference
Year Published: 1990
Abstract: Eddy current nondestructive evaluation (NDE) is widely used in the world of transportation, and especially in evaluation of the structural integrity of aircraft. Small cracks, subsurface cracks, and cracks forming in places where access is difficult, such as bolt holes, can only be detected in the field by the use of electromagnetic methods. A large number of commercial instruments and their associated probes are available for this purpose. For optimum performance, these instruments must be calibrated. This is usually accomplished by measuring artificial flaws in the form of drill holes, spark-cut (EDM) notches, or saw slots of varying dimensions in aluminum alloy plates. The problem with such calibrations is that these standard flaws bear little resemblance to an actual fatigue crack. Here we discuss the present situation in this field and describe research now underway at NIST to develop flaw Standard Reference Materials (SRMs) and Research Materials (RMs) that more closely approximate the behavior of actual fatique cracks. In particular, we will concentrate on a recently-issued RM (# 8458) which is a prototype of such a crack standard.

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