Journal of Materials Science

, Volume 44, Issue 16, pp 4219–4227 | Cite as

Effects of the wrinkled fabric preform on the bending properties of resin transfer molded composites

  • Thanh Trung Do
  • Dong-Joo LeeEmail author


During the preform loading of the Resin Transfer Molding (RTM) process, wrinkling in the fabric preform could occur and affect the quality of the bending properties. This study considers the effects that several wrinkled models with different wrinkled lengths in the fabric preforms of K618/R409 and K618/R235 composites have on bending properties. It is found that the experimentally measured values of the bending modulus and strength show a fair agreement with the predicted values using the modified rule of mixtures. Due to the effects of wrinkling, the bending modulus of the wrinkled models is larger than that of the normal model as a function of fiber volume fraction (Vf). Based on the energy method, the effects of wrinkling on the bending modulus are determined and described by the wrinkled parameters (α). The bending strengths of the wrinkled models have two fracture mechanisms as a function of the ratio of wrinkled length to span length (LW/L). In addition, the safe bending strengths of the wrinkled models are determined.


Fiber Volume Fraction Fiber Concentration Breaking Fiber Resin Transfer Molding Shear Factor 



This research was supported by the research grants of Yeungnam University in 2007.


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.School of Mechanical EngineeringYeungnam UniversityGyeongsanKorea

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