Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

Over the past two years an electrostatic instrumentation approach has been pursued whereby direct current is injected into green-state powder metallurgy (P/M) compacts followed by subsequent recording of the voltages on the surface. Owing to the fact that P/M specimens are moderate to low conducting samples, even small currents can produce a significant voltage distribution across the surface that can be recorded by an array of sensing probes arranged in a planar or non-planar configuration [1–4]. The presence of flaws, manifesting themselves in conductivity contrasts, can be sensed as a different voltage distribution when compared to the unflawed baseline voltage response.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18B

Chapter

Chapter 7: New Techniques and Applications

Section

New Techniques, Applications, and Devices

Pages

2047-2053

DOI

10.1007/978-1-4615-4791-4_262

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Instrumentation Development for Crack Detection of Surface and Subsurface Defects in Green-State P/M Compacts Through Multiprobe Electric Resistivity Testing

Snowbird, UT, USA

Over the past two years an electrostatic instrumentation approach has been pursued whereby direct current is injected into green-state powder metallurgy (P/M) compacts followed by subsequent recording of the voltages on the surface. Owing to the fact that P/M specimens are moderate to low conducting samples, even small currents can produce a significant voltage distribution across the surface that can be recorded by an array of sensing probes arranged in a planar or non-planar configuration [1–4]. The presence of flaws, manifesting themselves in conductivity contrasts, can be sensed as a different voltage distribution when compared to the unflawed baseline voltage response.