Abstract
A mesoscopic analytical model of wrinkling of Plain-Woven Composite Preforms (PWCPs) under the bias extension test is presented, based on a new instability analysis. The analysis is aimed to facilitate a better understanding of the nature of wrinkle formation in woven fabrics caused by large in-plane shear, while it accounts for the effect of fabric and process parameters on the onset of wrinkling. To this end, the mechanism of wrinkle formation in PWCPs in mesoscale is simplified and an equivalent structure composed of bars and different types of springs is proposed, mimicking the behavior of a representative PWCP element at the post-locking state. The parameters of this equivalent structure are derived based on geometric and mechanical characteristics of the PWCP. The principle of minimum total potential energy is employed to formluate the model, and experimental validation is carried out to reveal the effectiveness of the derived wrinkling prediction equation.
Highlights
Taking advantage of the unique combination of light weight and strength, Textile StructuralComposites (TSCs) have long been recognized as an attractive material for the applications extending from automotive parts to aircraft structures [1]
A mesoscopic study on wrinkling of the Plain-Woven Composite Preforms (PWCPs) in the Bias Extension Test (BET) was presented based on an instability analysis point of view
By considering the mechanism of wrinkle formation in mesoscale, an equivalent structure mimicking the behavior of a representative PWCP element in the post-locking stage was proposed
Summary
Taking advantage of the unique combination of light weight and strength, Textile Structural. The shear deformation of woven fabric in the post-locking stage will proceed to a certain limit, termed as the ‘wrinkling onset’ This instant is one of the main concerns in the forming of PWCPs. To analyze the shear behavior and the nature of wrinkle formation—due to large shear—in the woven composite preforms, two experimental characterization methods are widely employed in the literature, namely the Bias Extension Test (BET) and the Picture Frame Test (PFT) [7]. In mechanical structures under compressive forces, there are discrete values of the load at which position To put it differently, a system under critical compressive loads admits additional, but secondary secondary equilibrium equilibrium configurations configurations may may appear appear in in the neighborhood of the initial equilibrium adjacent, equilibrium states with different deformation patterns called structural modes [15]. Shear deformation (T and Ms denote the tension along yarn and in-plane shear coupling, respectively)
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