Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/135867
Title: QUASI-STATIC AND IMPACT CHARATERIZATIONS OF STITCHED FLAX FIBER COMPOSITE
Authors: MOHAMMAD RAVANDI
Keywords: Natural fibers, Flax fibers, Stitching, Mode I fracture toughness, Delamination, Impact behavior
Issue Date: 17-Jan-2017
Source: MOHAMMAD RAVANDI (2017-01-17). QUASI-STATIC AND IMPACT CHARATERIZATIONS OF STITCHED FLAX FIBER COMPOSITE. ScholarBank@NUS Repository.
Abstract: This thesis reports a comprehensive study on the effects of through-the-thickness stitching using natural fibers on the mechanical and impact properties of flax/epoxy composites. Flax and cotton fibers were used to stitch preforms of woven fabric and unidirectional laminates in various stitch densities. A virtual double-cantilever-beam test was developed to analyze delamination propagation of the stitched composites by means of the cohesive element with a trilinear traction-separation law and a 2-node beam element. A finite element modeling of the drop-weight impact test on woven flax fiber composite was also implemented to study the material behavior, damage development, and impact fracture resistance. The results of this study show that flax-yarn stitching is a promising technique to enhance the interlaminar fracture toughness of flax/epoxy composites. However, it facilitates the propagation of in-plane cracks, resulting in a reduction in the tensile properties as well as the transverse impact resistance of the composites.
URI: http://scholarbank.nus.edu.sg/handle/10635/135867
Appears in Collections:Ph.D Theses (Open)

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