Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)

The Korean Society of Industry Convergence (한국산업융합학회)
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Theoretical Analysis of Change in Magnetic Flux Density Due to Load for Measuring KI

응력확대계수측정을 위한 하중에 의한 자속밀도변화의 이론적 해석

  • Lee, Jeong-Hee (Dept. of Industrial Safety and Health, Daegu Haany University)
  • 이정희 (대구한의대학교 보건학부 산업안전보건전공)
  • Received : 2003.08.13
  • Accepted : 2003.11.20
  • Published : 2003.11.30
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Abstract

In order to determine the effective way of measuring the Mode I stress intensity factor for a material containing a two-dimensional surface crack by means of the alternating current potential drop(ACPD) technique, the change in magnetic flux density between crack surfaces and above the specimen surface due to load was studied theoretically. The magnetic flux density in the air between crack surfaces is uniform and above the specimen surface is not changed by increasing the load in the material. Therefore, the change in potential drop due to load in a measuring system which was designed to induce a large amount of electro-motive force was caused by the change in internal inductance of material, the change in the mutual inductance between internal inductance of material and measuring system and the change in the mutual inductance between internal inductance of material and power supply line.

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