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Measurement and Compensation of Spring-back of a Hybrid Composite Beam

School of Mechanical and Aerospace Engineering & Institute of Advanced Machinery and Design Building 301, Room 1205, Seoul National University San 56-1, Shinlim-dong, Kwanak-ku, Seoul, Korea, 151-742

Won-Shik Chu

School of Mechanical and Aerospace Engineering & Institute of Advanced Machinery and Design Building 301, Room 1205, Seoul National University San 56-1, Shinlim-dong, Kwanak-ku, Seoul, Korea, 151-742

Sung-Hoon Ahn

School of Mechanical and Aerospace Engineering & Institute of Advanced Machinery and Design Building 301, Room 1205, Seoul National University San 56-1, Shinlim-dong, Kwanak-ku, Seoul, Korea, 151-742, ahnsh{at}snu.ac.kr

Myung-Shik Won

Agency for Defence Development, Yuseong P.O. Box 35 Daejeon, Korea, 305-600

Fiber-reinforced composite materials have been advanced in various applications for their excellent mechanical and electromagnetic properties. On their manufacturing processes, however, thermo-curing inherently produces the undesired thermal deformation, so-called spring-back, mainly caused by temperature drop from the process temperature to room temperature. In order to fabricate designed part geometry, the spring-back must be understood especially in hybrid composites consisting of distinct groups of different materials. In this research, the spring-back of a hybrid composite beam is measured by a series of experiments, and is predicted by the classical lamination theory (CLT) and finite element analysis (ANSYS). To confirm the predicted spring-back, {glass fiber/epoxy} + {carbon fiber/epoxy} asymmetric hybrid composites are fabricated under various conditions such as cure cycle, laminate thickness, stacking sequence, and curing sequence. The results from CLT and FEA agree well with the experimental data, but the spring-back cannot be removed completely. To fabricate flat hybrid composite beams, a web-based spring-back compensation service is developed. The CLT-based code allows the user to predict spring-back and to fabricate a mold that compensates spring-back.

Key Words: spring-back • fiber-reinforced composite materials • hybrid composite • web-based service • mold fabrication.

This version was published on April 1, 2007

Journal of Composite Materials, Vol. 41, No. 7, 851-864 (2007)
DOI: 10.1177/0021998306067064


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