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Spring-back in GFR / CFR Unsymmetric Hybrid Composite Materials  

Jung Woo-Kyun (서울대학교 기계항공공학부 대학원)
Ahn Sung-Hoon (서울대학교 기계항공공학부)
Won Myung-Shik (국방과학연구소)
Publication Information
Composites Research / v.18, no.6, 2005 , pp. 1-8 More about this Journal
Abstract
The fiber-reinforced composite materials have been advanced for various applications because of their excellent mechanical and electromagnetic properties. On their manufacturing processes, however, thermo-curing inherently produces the undesired thermal deformation mainly from temperature drop from the process temperature to the room temperature, so called spring-back. The spring-back must be understood especially in the hybrid composites in order to design and fabricate desired shape. In this research, (glass fiber / epoxy) + (carbon fiber / epoxy) unsymmetric hybrid composites were fabricated under various conditions such as cure cycle, laminate thickness, stacking sequence and curing sequence. Coupons were made and spring-back were measured using coordinate measuring machine (CMM). Using the Classical Lamination Theory (CLT) and finite element analysis (ANSYS), the behavior of spring-back were predicted and compared with the experimental data. The results from CLT and FEA agreed well with the experimental data. Although, the spring-back could be reduced by lowering curing temperature, at any case, the spring-back could not be removed completely.
Keywords
Thermal deformation; Spring-back; Class Fiber Reinforced Composite; Carbon Fiber Reinforced Composite; Unsymmetric hybrid composite;
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