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Shearography를 이용한 압력용기 내부 압력변화에 따른 결함부 변형량 측정
강찬근(Changeun Kang),김현호(Hyunho Kim),이현준(Hyunjun Lee),정현철(Hyunchul Jung),김경석(Kyeongsuk Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Shearography is an optical, Non-Destructive Testing technique that provides fast and accurate information about internal material discontinuities or anomalies in non-homogenous materials. Using laser light, a shearing interferometer is able to detect extremely small (sub-micrometer) changes in surface deformation. When a test object is subjected to an appropriate change in load, a proportional strain is induced on the test surface. If underlying surface discontinuities are present, the surface will deform unevenly which is interpreted through the interferometer as a shearographic image. Shearograpy allows users to measure and qualify large surfaces quickly and efficiently, yielding near real-time results.