Graduate Thesis Or Dissertation

 

Modeling of Fiber Microbuckling in Soft Composites Under Bending Public Deposited

https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/jh343s62q
Abstract
  • Soft ber reinforced composites are very suitable materials for space deployable structures.These materials are characterized by a very compliant matrix that allows the bersto highly deform so microbuckling under bending can appear without failure. This mechanismacts as a stress-reliever, so the material can be folded to very high curvatures withoutdamage. However, the existing models are not able to accurately capture the mechanicalbehavior of these materials.A new micromechanical model is proposed for this materials under bending. Themodel considers both the pre and post buckling regimes using a large strain formulation.The strain energy is calculated as the sum of the energy in the matrix and the bers. Theenergy of the matrix is calculated using homogenization methods and the energy of the bersis approximated using classical beam theory. The obtained energy model is a function ofthe position of the neutral axis, the buckling wavelength and a function that denes wherebuckling appears through the thickness. These parameters are calculated by minimizing theenergy.The results obtained from the theoretical model are compared with numerical simulations.The comparison shows good agreement for the pre-buckling regime but it does notpredict well the curvature when buckling appears. The inuence of some problem parameterssuch as the volume fraction and the shear modulus of the materials is also studied.
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  • 2018
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  • 2019-11-18
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