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Development of ACPD technique for short and long crack measurement

Zhou, S; Turnbull, A (2000) Development of ACPD technique for short and long crack measurement. NPL Report. CMMT(A)254

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Abstract

The application of the alternating current potential drop (ACPD) technique for measurement of the depth of short cracks initiated from corrosion pits has been investigated. Cylindrical specimens were pre-pitted using a NPL procedure which enables the development of essentially a single pit of controlled depth. Cracks of varying depth were then generated under uniaxial tension-tension loading. Calibration of the measured potential drop was performed using dye, beach marking and corrosion stain techniques. The effect of stress, temperature, test environment and test duration on the ACPD measurement was evaluated. Comparison with measurement of long crack behaviour in fracture mechanics specimens is made and the effectiveness of the ACPD technique for resolving the depth of short cracks from pits is quantified.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMMT(A)254
Subjects: Advanced Materials
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2513

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