Theoretical Analysis of Loading Effect on A. C. Potential Drop for Measurement of Cracks

Masumi Saka, Takashi Kaneko, Hiroyuki Abé

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1 Citation (Scopus)


A method for theoretical analysis of loading effect on a. c. potential drop is proposed for measurement of cracks. By treating formulation to solve Maxwell’s equations for an a. c. current flow in a specimen, it is found that the conductivity σ and the permeability µ of the specimen can be handled collectively in the form [formula omitted]. The quantity [formula omitted] is denoted by γ. Loading causes a change in γ. Since the change is considered to be dominant along the crack front, the loading effect is analyzed by introducing a thin layer confining the change along the crack front. The layer is named line impedance. Its property is determined by a frequency of the current and the change in γ, which is expressed as a function of the stress intensity factor, KI, through a 2-D experiment. Numerical results are shown for a semielliptical and a semicircular surface crack.

Original languageEnglish
Pages (from-to)1116-1122
Number of pages7
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Issue number537
Publication statusPublished - 1991


  • A. C. Potential-Drop Technique
  • Finite-Element Method
  • Fracture Mechanics
  • Line Impedance
  • Stress Intensity Factor
  • Surface Crack

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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