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Best Paper Award
S C I E N C E A N D TECHNOLOGY OF
Science and Technology of Advanced Materials 3 (2002) 67
ADVANCED MATERIALS
www.elsevier.com/locate/stam
Announcement
Best Paper Award in Science and Technology of Advanced Materials for 2000 ªNon-contact Measurement of Acoustic Emission in Materials by Laser Interferometryº by Manabu Enoki, Makoto Watanabe, Pornthep Chivavibul and Teruo Kishi Vol. 1, No. 3, pp. 157±165. This paper proposed a novel technique for quantitative evaluation of elastic wave (acoustic emission, AE) caused by microfracture in materials at elevated temperature using non-contact laser interferometer. AE measurement using piezoelectric transducers is a well-known method to detect and analyze microfracture and this is also applicable to a measurement at elevated temperature by a long wave guide. However, this wave guide has a problem in quantitative analysis, because wave propagation in bar easily losses the original information of microfracture and it is very dif®cult to reconstruct a source. The paper describes the development of non-contact measuring system of AE by laser interferometer in order to detect AE signals and quantitatively analyze microfracture during materials testing. The capability of this system was estimated by comparison between the simulated AE signals due to glass capillary breaking and the calculation using ®nite element method. It could measure AE signals during practical tensile test of carbon ®ber reinforced plastics. This technique was also applied to the thermal cycle test of ceramic/metal coatings, and AE signals during cooling were successfully detected and analyzed by deconvolution method to quantitatively evaluate the microfracture process. The proposed technique is expected to be used in various applications of materials testing.
Manabu Enoki
Makoto Watanabe
1468-6996/02/$ - see front matter q 2002 Elsevier Science Ltd. All rights reserved. PII: S 1468-699 6(02)00019-0
Pornthep Chivavibul
Teruo Kishi
Science and Technology of Advanced Materials 3 (2002) 67
ADVANCED MATERIALS
www.elsevier.com/locate/stam
Announcement
Best Paper Award in Science and Technology of Advanced Materials for 2000 ªNon-contact Measurement of Acoustic Emission in Materials by Laser Interferometryº by Manabu Enoki, Makoto Watanabe, Pornthep Chivavibul and Teruo Kishi Vol. 1, No. 3, pp. 157±165. This paper proposed a novel technique for quantitative evaluation of elastic wave (acoustic emission, AE) caused by microfracture in materials at elevated temperature using non-contact laser interferometer. AE measurement using piezoelectric transducers is a well-known method to detect and analyze microfracture and this is also applicable to a measurement at elevated temperature by a long wave guide. However, this wave guide has a problem in quantitative analysis, because wave propagation in bar easily losses the original information of microfracture and it is very dif®cult to reconstruct a source. The paper describes the development of non-contact measuring system of AE by laser interferometer in order to detect AE signals and quantitatively analyze microfracture during materials testing. The capability of this system was estimated by comparison between the simulated AE signals due to glass capillary breaking and the calculation using ®nite element method. It could measure AE signals during practical tensile test of carbon ®ber reinforced plastics. This technique was also applied to the thermal cycle test of ceramic/metal coatings, and AE signals during cooling were successfully detected and analyzed by deconvolution method to quantitatively evaluate the microfracture process. The proposed technique is expected to be used in various applications of materials testing.
Manabu Enoki
Makoto Watanabe
1468-6996/02/$ - see front matter q 2002 Elsevier Science Ltd. All rights reserved. PII: S 1468-699 6(02)00019-0
Pornthep Chivavibul
Teruo Kishi