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Acknowledgement
The author would like to thank first of all his advisor, Prof. H.-J. Hoffmann, for this very
rewarding topic. His contagious enthusiasm is gratefully acknowledged and was the basis for
pushing this thesis far beyond the original expectations. Lengthy and useful conversations
with him expressed individuality and the entailing enthusiasm contributed greatly to fully
exploit the data, inspiring the author to broaden his experiences in experimental, numerical
and computational skills.
The execution of this work would not have been conceivable without the assistance from
colleagues and coworkers to whom I wish to indicate my sincere appreciation. Feeling unable
to put all these in an order of importance the only listing that hopefully does not do injustice
to anyone must be alphabetical a. In particular I am indebted to


Dr.-Ing. C. Alexandru to whom the author feels deepest gratitude for procuring the
constitutive equation for a ‘Zener-Maxwell-body’ in three-dimensional space in tensor
notation which seems impossible to come by in the literature



Dr.-Ing. W. Baumann from the Konrad-Zuse-Zentrum für Informationstechnik Berlin
who advised the author on the many pitfalls of ABAQUS and its implementation in an
effort to master the finite-element simulations without ever feeling pestered (didn’t
say so at least)



Practitioner and Dipl.-Min. B. Büchtemann for inspirational nutritional facts



Prof. Dr.-Ing. C. Fleck for serving as chairwoman



Mr T. Hamfler to whom a special note of appreciation is dedicated for machining
specimens from glass blocks and bizarre talk



Prof. U. Hildebrandt for distracting chats every now and then garnished with
occasional revelations from long-time experience



Dipl.-Ing. K. Jirka for providing moral support in long office nights that had a positive
impact



Dipl.-Phys. B. Kühn, Heraeus Quarzglas GmbH & Co. KG Hanau, for generously
donating the specimen material



a

the machine shop staff G. Hautmann, P. Schneppmüller, M. Ziehe and W. Eisermann

All persons listed are affiliated with the Technical University of Berlin if not stated otherwise.

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