Modelling of failure of structural textile composites

Abstract

Publication informationComputational ABSTRACTThis paper summarizes extensive experimental work regarding the manufacture, mechanical characterization and modelling of textile thermoplastic composites produced by means of commingled yarns. These composites are believed to have a high potential for applications in structural automotive components. However, methods need to be developed for faster manufacturing and reliable prediction of the component mechanical performance and failure. A practical approach of finite element modelling of the stiffness and strength behaviour of these composites is briefly discussed. IntroductionThe continued successful usage of composite materials requires not only good mechanical performance but also fast manufacturing procedures. Glass Mat Thermoplastic (GMT) materials have proven their worth in large volume components in the automotive industry but their random fiber distribution and relatively low fiber volume fraction have limited the use to semi-structural applications. However, with the vast technology available in the textile industry there is much potential to accelerate the production process and to expand the range of mechanical properties and thus to develop new structural applications for composite materials.The use of advanced textile preforms puts new demands on the models and procedures that are used for predicting component performance such as, for example, finite element analysis (FEA). New, and more accurate, material models, failure criteria and analysis procedures are required for an optimal design of composites components. This is

Influence of heat transfer material on the deformability of knitted fabrics

“…It was determined that coated fabrics failure using their uniaxial extension may be of three types: instantaneously break of both layers, the distortion of specimen in different surface zones lasts a period of time and the distortion of separate layers not at the same time (Masteikaitė and Sacevičienė, 2005). The failure of more complicated materials, as thermoplastic textile composites may be characterized by numerous mechanisms, such as cusp formation, matrix shearing, matrix cracking, fiber pull-out, resin pockets and fiber bridging (Svensson and Gilchrist, 2000). Loop shape, loop length, and fabric tightness have a large effect on the mechanical properties of knitted fabric composites (Wang and Hu, 2007).…”

“…The stress level was chosen in accordance with the recommendations of the Kawabata Evaluation system for Fabrics ( Kawabata and Niwa, 1991). This system is used for testing woven and knitted fabrics, and their composites (Gokarneshau and Thangamani, 2012;Svensson and Gilchrist, 2000). To determine the strain ε 1 under low stress conditions, a force of F 1 ¼ 4.9 N/cm was used.…”

Optimised design of nested circular tube energy absorbers under lateral impact loading

“…Non-recoverable (inelastic) energy can exist in various forms such as plastic deformation, viscous energy and friction or fracture energy in both metallic and composite structures [1,2,3]. Circular or square sectioned tubes are among the most commonly used structural elements due to their prevalent occurrence and easy manufacturability.…”