Degradation in Tensile Properties with Overlapped and Discontinuous Fabric Preforms

Title
Degradation in Tensile Properties with Overlapped and Discontinuous Fabric Preforms
Author(s)
이동주도트렁
Keywords
SINGLE-LAP JOINTS; RESIN-TRANSFER; MECHANICAL-PROPERTIES; FIBER COMPOSITES; STRENGTH; BEHAVIOR; CARBON/EPOXY; PERFORMANCE; STRESSES
Issue Date
201108
Publisher
TAYLOR & FRANCIS LTD
Citation
ADVANCED COMPOSITE MATERIALS, v.20, no.5, pp.443 - 462
Abstract
Measured tensile properties including the modulus, strength and elongation of resin transfer molded composites, which were fabricated using several fabric preforms through the normal, overlapped and discontinuous models, were compared. As expected, the overlapped and discontinuous models had lower tensile modulus and strength than the normal model; these values were functions of the effective fiber-volume fraction. The differences were examined and used to predict the overlap-damage and discontinuous-damage parameters, which were developed from the energy method, rule of mixture and failure modes. Also, the results showed that the final failures of the overlapped and discontinuous models were either interfacial bond failure or breaking fibers depending on the overlapped and discontinuous lengths. Since discontinuous fabrics in the preform cannot be avoided in designing and manufacturing composites, the ratio of the discontinuous gap to the gauge length (L-G/L) should be less than 0.05. Also, the ratio of the discontinuous length to the gauge length (L-D/L) should be large to minimize the influence of the stress concentration. Also, in light of the fiber-volume fraction, composites designed with the overlapped preform are better than those with the discontinuous preform. (C) Koninklijke Brill NV, Leiden, 2011
URI
http://hdl.handle.net/YU.REPOSITORY/24791http://dx.doi.org/10.1163/092430411X576765
ISSN
0924-3046
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공과대학 > 기계공학부 > Articles
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