NON-LINEAR ELASTIC BEHAVIOR OF HYBRID BRAIDED PREFORMS

摘要

Composite rebar, arterial grafts, performance cycling apparel, and erosion control fabrics are just a few examples of applications with nonlinear elastic requirements. Hybrid preforms have the potential to meet these complex load performance requirements, since these fabrics contain different fibrous constituents that provide contrasting elastic properties. Due to the challenge of designing and modeling these fabrics, many times they are developed on a trial and error basis. This study is focussed on understanding the behavior of such materials. Nonlinear braided preforms have been constructed from yarns with contrasting mechanical properties. Deformation during tensile loading was quantified using image analysis. Yam and fabric deformation data were used to construct a numerical model to deepen our understanding of the inherent design parameters involved in the hybrid preform behavior.