Damage Monitoring of CP-GFRP/GFRP Composites by Measuring Electrical Resistance

Soon-Gi Shin; Yong Jung Kwon

Korean Journal of Materials Research, Vol.20, No.3, 148-154, March, 2010

DOI10.3740/MRSK.2010.20.3.148 Export Citation

Damage Monitoring of CP-GFRP/GFRP Composites by Measuring Electrical Resistance

Soon-Gi Shin^†, and Yong Jung Kwon¹

Department of Advanced Materials Engineering, College of Samcheok, Kangwon National University, Samcheok, Gangwon-do, 245-711, Republic of Korea
¹Department of Chemical Engineering, College of Chuncheon, Kangwon National University, Chuncheon, Gangwon-do, 200-701, Republic of Korea

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It is necessary to develop new methods to prevent catastrophic failure of structural material in order to avoid accidents and conserve natural and energy resources. Design of intelligent materials with a self-diagnosing function to prevent fatal fracture of structural materials was achieved by smart composites consisting of carbon fiber tows or carbon powders with a small value of ultimate elongation and glass fiber tows with a large value of ultimate elongation. The changes in electrical resistance of CF-GFRP/GFRP (carbon fiber and glass fiber-reinforced plastics/glass fiber-reinforced plastics) composites increased abruptly with increasing strain, and a tremendous change was seen at the transition point where carbon fiber tows were broken. Therefore, the composites were not to monitor damage from the early stage. On the other hand, the change in electrical resistance of CP-GFRP/GFRP (carbon powder dispersed in glass fiber-reinforced plastics/glass fiber-reinforced plastics) composites increased almost linearly in proportion to strain. CP-GFRP/GFRP composites are superior to CF-GFRP/GFRP composites in terms of their capability to monitor damage by measuring change in electrical resistance from the early stage of damage. However, the former was inferior to the latter as an application because of the difficulties of mass production and high cost. A method based on monitoring damage by measuring changes in the electrical resistance of structural materials is promising for improved reliability of the material.

Keywords:carbon powder;plastics;electrical resistance;smart composites;damage monitoring

[References]

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[Related Articles]

[1] Konsztowicz KJ, Fontaine D, J. Am. Ceram. Soc., 731, 2809 (1990)

[2] Leal ES, Lopes RJ, Meas. Sci. & Technol., 6, 188 (1995)

[3] Kersey AD, in Proceedings of First World Conference on Structural Control (Los Angeles, CA, 1994), ed. H. Takagi, (Cmcbooks, Tokyo, 1994) p.167. (1994)

[4] Masri SF, Devries MJ, Clus RO, J. Eng. Mech., 120, 1696 (1994)

[5] Merzbacher CI, Kersey AD, Friebele EJ, Smart Mater. Struct., 5, 196 (1996)

[6] Ikeue K, Encyclopedia of Composite Materials, p.51, ed. Miyairi H, Asakurasyoden, Tokyo (1991) (in Japanese). (1991)

[7] Schulte K, Baron C, Compos. Sci. Technol., 36, 63 (1989)

[8] Muto N, Yanagida H, Nakatsuji T, Sugita M, Ohtsuka Y, J. Am. Ceram. Soc., 76, 875 (1993)

[9] Muto N, Yanagida H, Nakatsuji T, Sugita M, Ohtsuka Y, Arai Y, Smart Mater. Struct., 1, 324 (1992)

[10] Muto N, Yanagida H, Nakatsuji T, Sugita M, Ohtsuka Y, Arai Y, J. Ceram. Soc. Jpn., 100(12), 1429 (1992)

[11] Muto N, Yanagida H, Nakatsuji T, Sugita M, Ohtsuka Y, Arai Y, Adv. Compos. Mater., 4(4), 297 (1995)

[12] Y. Arai, N. Muto, H. Yanagida, T. Nakatsuji, M. Sugita, Y. Ohtsuka, J. Ceram Soc. Jpn., 102(12), 745 (1994)

[13] Shin SG, Met. Mater. Int., 7(6), 519 (2001)

[14] Ishida, Yanagida SH, Matsubara H, Shin SG, Japan patent; No. 9-207872, No. 11-220259.

[15] Stauffer D, Aharony A, Introduction to Percolation Theory, 2nd ed., Tayler & Francis, London (1992). (1992)

[16] Shin SG, Lim HJ, Lee JH, Korean J. Mater. Res., 13(11), 732 (2003)

[17] Shin SG, Kim YH, Lee JH, Korean J. Mater. Res., 12(2), 135 (2002)