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Homogenization and Dimension Reduction of a Textile Shell and Minimization of Buckling with Microstructure-Optimization

: Wackerle, Stephan

Fulltext urn:nbn:de:0011-n-6389543 (3.3 MByte PDF)
MD5 Fingerprint: ac944b0cb38b69b4a84dabb6e70fb071
Created on: 25.8.2021

Stuttgart: Fraunhofer Verlag, 2021, VII, 127 pp.
Zugl.: Kaiserslautern, TU, Diss., 2020
ISBN: 978-3-8396-1704-5
Dissertation, Electronic Publication
Fraunhofer ITWM ()
mathematical modelling; functional analysis & transforms; optimization; differential calculus & equation; homogenization; Variational Calculus; mathematical modelling; optimization; dimension reduction; Mathematiker; Physiker; Ingenieur

The topic of this thesis originated in the task to optimize a belt-shaped textile structure with respect to buckling. The approach is divided into two main steps: asymptotic analysis and optimization. First, we show the simultaneous homogenization and dimension reduction for the textile elasticity problem using the unfolding method. In particular, the effective model is derived for different energy regimes, depending on periodicity, applied force and fiber-to-fiber contact. The different energy regimes use different approaches, where for linear elasticity variational inequalities are used, while the nonlinear von-Karman regimes requires arguments of the Gamma-Convergence to derive the limit problem.
In the second part the resulting homogenized problem gives rise to an effective textile plate problem and the corresponding cell problems. The cell problems connect macroscopic textile properties and the microscopic ones, namely the fibers, their contact and weaving pattern. This allows to use a macroscopic buckling model for further investigation and optimization. Eventually, the cell problems yield the corresponding microscopic properties for a buckling optimized textile.