Study of Crack Length Measurement and Crack Tip Plastic Zone Determination by Infrared Thermography

Abstract:

This paper reports a new way to conduct fracture mechanics experiments of welded thin-walled structure for aircraft fuselage applications made of the Al 6156 ally using lock-in infrared thermography. The heat wave, generated by both the themo-mechanical coupling and intrinsic energy dissipation was detected by an infrared camera. The crack growth rate measured by the lock-in infrared thermography is found to be consistent with that measured by conventional method. It is observed that the crack can either grow underneath the stiffener or grow into the stiffener web with the crack length measured at the same time. In addition, the crack tip plastic zone was observed before the specimen was about to be destroyed.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 2399-2404
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.2399
• Online since: June 2014
• Authors: Yan Guang Zhao*, Jian Zhong Liu, Ben Run Hu, Bo Chen, Xiang Guo
• Keywords: Crack Growth Rate, Fracture Mechanics Test, Lock-In Infrared Thermography, Thin-Walled Structure

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