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Sensors 2017, 17(12), 2824; https://doi.org/10.3390/s17122824

Fatigue Damage Evaluation of Short Carbon Fiber Reinforced Plastics Based on Phase Information of Thermoelastic Temperature Change

1
Department of Mechanical Engineering, Kobe University, Kobe 657-8501, Japan
2
DIC Corporation, Tokyo 103-8233, Japan
*
Author to whom correspondence should be addressed.
Received: 14 November 2017 / Revised: 30 November 2017 / Accepted: 1 December 2017 / Published: 6 December 2017
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Abstract

Carbon fiber-reinforced plastic (CFRP) is widely used for structural members of transportation vehicles such as automobile, aircraft, or spacecraft, utilizing its excellent specific strength and specific rigidity in contrast with the metal. Short carbon fiber composite materials are receiving a lot of attentions because of their excellent moldability and productivity, however they show complicated behaviors in fatigue fracture due to the random fibers orientation. In this study, thermoelastic stress analysis (TSA) using an infrared thermography was applied to evaluate fatigue damage in short carbon fiber composites. The distribution of the thermoelastic temperature change was measured during the fatigue test, as well as the phase difference between the thermoelastic temperature change and applied loading signal. Evolution of fatigue damage was detected from the distribution of thermoelastic temperature change according to the thermoelastic damage analysis (TDA) procedure. It was also found that fatigue damage evolution was more clearly detected than before by the newly developed thermoelastic phase damage analysis (TPDA) in which damaged area was emphasized in the differential phase delay images utilizing the property that carbon fiber shows opposite phase thermoelastic temperature change. View Full-Text
Keywords: nondestructive evaluation; thermoelastic stress analysis; phase analysis; infrared camera; short carbon fiber reinforced plastics nondestructive evaluation; thermoelastic stress analysis; phase analysis; infrared camera; short carbon fiber reinforced plastics
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Shiozawa, D.; Sakagami, T.; Nakamura, Y.; Nonaka, S.; Hamada, K. Fatigue Damage Evaluation of Short Carbon Fiber Reinforced Plastics Based on Phase Information of Thermoelastic Temperature Change. Sensors 2017, 17, 2824.

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