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January 14, 2026Journal of Testing and Evaluation

Calibration Functions to Determine Crack Size Using the Direct Current Electric Potential Difference Method for Standard Fracture Toughness Specimen Geometries

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Authors

JSJohan SchuurmansMSMarc Scibetta

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Overview

Calibration functions determine crack size in standard fracture toughness specimens, suggesting improved measurement accuracy.

Key Points

  • Establish calibration functions to reliably infer crack size from electric potential measurements in fracture toughness specimens.
  • Developed calibration relationships for common fracture toughness geometries.
  • Used finite element analysis to support calibration relationships.
  • Proposed a new voltage measurement point location compatible with clip-on gauges.
  • Defined a procedure for identifying crack initiation on PD versus displacement plots.
  • Calibration relationships validated against ASTM E1820-24 reference method.
  • Crack extension predictions met criteria for both the PD and unloading compliance methods.
  • Critical fracture toughness results from the PD method aligned well with UC and energy normalization methods.
  • Normalization data reduction method overestimated the JQ value obtained from the PD method.

Cite This Study

Schuurmans et al. (2026) studied this question.

synapsesocial.com/papers/6967197b87ba607552bb975chttps://doi.org/10.1520/jte20240633
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