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Journal of Composite Materials
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Tracking Hygrothermal Strains of Carbon/Epoxy Composite under Varying Temperature and Humidity

Cho-Liang Tsai

Department of Construction Eng., Nat'l Yunlin U. of Sci. & Tech. 123 Sec. University Rd., Touliu, Yunlin 640, Taiwan, tsaicl{at}ce.yuntech.edu.tw

Chih Hsing Wang

Graduate School of Eng. Sci. & Tech., Nat'l Yunlin U. of Sci. & Tech. 123 Sec. University Rd., Touliu, Yunlin 640, Taiwan, Department of Commercial Technology Management, Transworld Institute of Technology, 1221 Jen-Nang Rd., Touliu, Yunlin 640, Taiwan

Jiang-Jhy Chang

Department of Harbor and River Eng., Nat'l Taiwan Ocean U. 2 Pei-Ning Rd., Keelung 202, Taiwan

Weichung Yeih

Department of Harbor and River Eng., Nat'l Taiwan Ocean U. 2 Pei-Ning Rd., Keelung 202, Taiwan

An algorithm was developed based on diffusion and hygrothermal expansion theories to quantify the real-time hygrothermal deformation of a composite structure. The algorithm can be used to calculate the dynamic hygrothermal strain of composite laminates that is caused by constantly changing environmental humidity and temperature. Experiments were performed on carbon/ epoxy laminates in a conditioning chamber where relative humidity and temperature were set to vary stepwise and the hygrothermal strains of the specimens were monitored. The hygrothermal strains were calculated theoretically from humidity and thermal history throughout each experiment and confirmed experimentally.

Key Words: diffusion • humidity • hygrothermal strain • temperature.

Journal of Composite Materials, Vol. 42, No. 16, 1597-1618 (2008)
DOI: 10.1177/0021998308092209
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