Braiding Simulation and Prediction of Mechanical Properties |
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Authors: | Anthony K Pickett Justas Sirtautas Andreas Erber |
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Affiliation: | (1) Institute for Aircraft Design, University of Stuttgart, Stuttgart, Germany;(2) Engineering Systems International, Mergenthalerallee 15-21, 65760 Eschborn, Germany;(3) Institute of Applied Mechanics, Commas MSc Program, University of Stuttgart, Stuttgart, Germany |
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Abstract: | Rotary braiding is a cost effective method to manufacture near net shaped preforms that generally have a closed section and
may have an arbitrary shape if braiding is performed over a shaped mandrel. The reinforcement architecture can be varied by
the number and spacing of active bobbins, and by the speeds used to ‘take-up’ the braid and move the circumferential bobbins.
Analytical methods are available that can reliably predict yarn paths and the final braid meso-structure for simple regular
sections, and further analytical methods have been proposed to estimate composite braid elastic mechanical properties. A full
simulation chain using the explicit Finite Element (FE) technique is presented for composite braid manufacture and mechanical
stiffness prediction of the final composite. First simulation of the braiding process provides detailed information on yarns
paths and braid meso-structure, from which Representative Volume Elements (RVE) of the braid may be constructed for analysis
of stiffness properties. The techniques are general and can be applied to any braid geometry. A specific problem of meshing
the yarn structure and interspersed resin volumes is overcome using conventional solid elements for the yarns and Smooth Particle
Hydrodynamics for the resin, with link element to join the two constituents. Details of the background theory, braid simulation
methods, meso- model analysis and validation again analytical and test measurements are presented. |
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