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Ultrasound Thermography Technique for Detecting Micro Defects in Vehicle Engine Block

자동차 엔진블럭의 미세크랙 검출을 위한 초음파 서모그래피 기법에 관한 연구

  • Kim, Sung Hyun (Dept. of Advanced Parts and Materials Engineering, Chosun Univ.) ;
  • Kim, Jae Yeol (Dept. of Mechatronics Engineering, Chosun Univ.) ;
  • Choi, Seung Hyun (Dept. of Advanced Parts and Materials Engineering, Chosun Univ.)
  • 김성현 (조선대학교 첨단부품소재공학과) ;
  • 김재열 (조선대학교 메카트로닉스공학과) ;
  • 최승현 (조선대학교 첨단부품소재공학과)
  • Received : 2012.07.10
  • Accepted : 2013.01.25
  • Published : 2013.04.01

Abstract

An infrared thermography technique can be used to inspect a large area simultaneously and to detect defects such as cracks or delaminations in real time. Infrared thermography is a technique in which visual images are formed from the infrared range from subjects according to their thermal radiation. The molecules of all objects are disturbed by heat, and the molecular motion becomes more active when the temperature rises and less active when the temperature falls. In this study, the applicability and feasibility of ultrasound thermography for detecting defects in an engine block, which is a key component in the automobile industry, were verified. A nondestructive reliability test was conducted to study the defects, after which the results were analyzed.

적외선 열화상 기술은 넓은 면적을 동시에 검사할 수가 있고, 크랙 또는 박리와 같은 결함을 실시간으로 검출할 수 있으며, 일반적으로 적외선 열화상은 열복사로 피사체에서 방사되는 적외선 영역을 열화상 카메라를 통하여 가시적인 화상을 만들어 주는 기술이며 모든 물체의 분자가 열에 의해 교란되어 발생하는데 분자 운동은 물체의 온도가 올라가면 증가하고 온도가 내려가면서 감소한다. 본 연구에서는 초음파 서모그래피 기술과 기법의 적용과 타당성을 확인하여 엔진블록의 자동차산업 전반에 수요가 많은 대상체로 하였고, 결함 부위에 비파괴 신뢰성평가에 대한 실험을 수행하여 기술하였다.

Keywords

References

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