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9/8/98 AC 43.13-1B 5-134. GENERAL. Shearography was de- veloped for strain measurements. The process now provides a full-field video strain gauge, in real time, over large areas. It is an en- hanced form of holography, which requires the part to be under stress. A laser is used for illumination of the part while under stress. The output takes the form of an image proc- essed video display. This technique has been used effectively in locating defects, such as disbonds and delaminations, through multiple bondlines. It is capable of showing the size and shape of subsurface anomalies when the test part is properly stressed. Shearography has been developed into a useful tool for NDI. It can be used easily in a hangar environment, while meeting all laser safety concerns. Other applications include the testing of honeycomb structures, such as flaps and control surfaces. Shearography offers a great increase in the speed of inspection by allowing on-aircraft in- spections of structures without their removal, as well as inspections of large areas in just seconds. 5-135.5-140. [RESERVED.] Par 5-134 Page 5-55 (and 5-56) SECTION 12. SHEAROGRAPHYPDF Image | AFS-640
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