Evaluation of the electrical potential drop technique in the determination of crack growth resistance-curves of Carbon/Carbon composites and carbon bonded refractories

Antonarulrajah, A.; Ramos, Van; Fazluddin, Shahed; Rand, B.

doi:10.1007/s10853-005-6093-3

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…Optical observation methods, in which the fracture surface is marked or the crack tip extension is tracked by a travelling telescope [21], provide accurate predictions of crack lengths but are restricted by visual access [21,[38][39][40][41][42][43][44]. Continuous monitoring is unfeasible [38][39][40][41]44] and the accuracy is highly dependent on operator skill [15,21,40] and image quality [15].…”

Section: Opticalmentioning

confidence: 99%

“…The measured PDs are then correlated with crack lengths by using appropriate calibrations curves. Calibration curves and PD measurements are sensitive to several factors which include the crack/notch geometry [2,3,43,55,[129][130][131], the specimen geometry [3,43,47], the arrangement of current injection [2,3,47,55,130], and the location for potential measurements [3,43,47] (the latter two factors have been covered in Section 3.4.1). Moreover, in several studies involving multi-frequency ACPD method [22,124,132,133], calibration curves were found to be affected by operating frequency.…”

Section: Potential Differencementioning

confidence: 99%

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Potential difference methods for measuring crack growth: A review

Rouse

Hyde

2020

International Journal of Fatigue

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Non-destructive testing techniques are widely applied in industry for the evaluation of quantities of interest without inflicting additional damage accumulation. Crack detection and monitoring is a prime example of where non-destructive testing is valuable. Among the variety of non-destructive testing techniques, the direct current and alternating current potential difference methods, which are based on the principle that an electrical potential field around a conductive specimen is disturbed by the presence of geometric irregularities (or "features"), have received a great deal of attention in the literature. This is mainly due to the high levels of accuracy associated with these techniques and good estimations of crack initiation and propagation having been achieved.A critical review of the evolution and applications of potential difference methods is presented in this paper. Potential difference methods are capable of providing accurate and continuous measurements with simple installation and exclude the requirement of visual access under harsh service conditions. Alternating current potential difference methods require lower current input than direct current equivalents and hence provide higher sensitivity and offer better noise rejection but are vulnerable to capacitance effects and are more expensive. Calibration curves can be determined analytically, numerically, or by direct or analogue experimental techniques with each method offering strengths and limitations. Application of these should be determined in accordance with the specific scenario. The performance of electric probes (of voltage measurements and current injection) on topand side-face of C(T) and SEN(B) specimens are reviewed in detail as case examples. Specific guidance in normalising measurements and eliminating errors from thermoelectric effects can be implemented in order to improve the accuracy of PD methods. Abundant results have been obtained by applying PD methods in monitoring cracks geometries under aggressive conditions such as corrosion, high temperature, creep and cycled loading.

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