Calculation of the Electrical Resistance of a Compact Tension Specimen for Crack-Propagation Measurements

Mark E. Orazem
1985 Journal of the Electrochemical Society  
The electrical resistance of a notched compact specimen for determination of plane-strain fracture toughness was calculated using numerical methods coupled with the Schwarz-Christoffel transformation. Experimental measurement of this resistance is commonly used to obtain the crack length in notched specimens subjected to stress corrosion and hydrogen embrittlement tests. The results presented here predict the shape of the calibration curve for this experiment and facilitate optimal design of
more » ... ptimal design of notched specimens for sensitivity of the resistance measurements to crack length. The electrical resistance is shown to be most sensitive to crack length for specimens containing a small starter notch. Placement of the current input leads also influences the sensitivity of the specimen resistance to the crack length. An analytic interpolation formula is presented for the primary resistance as a function of cell dimensions that reproduces the calculated results to within 5%. J. Electrochem.
doi:10.1149/1.2114292 fatcat:yri2ueq7nzhmza22ukjyityvkm