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@PHDTHESIS{Stratmann:1013945,
author = {Stratmann, Ina},
othercontributors = {Schindler, Christian and Pospischil, Ferdinand},
title = {{G}enauigkeit und {G}renzen von {K}ohlepapier und
{D}ruckmessfolie im {K}ontakt {H}ertz’scher {K}örper und
von {R}ad und {S}chiene; 1. {A}uflage},
volume = {6},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {Apprimus Verlag},
reportid = {RWTH-2025-05813},
isbn = {978-3-98555-292-4},
series = {Schriftenreihe Schienenfahrzeuge und Transportsysteme},
pages = {1 Online-Ressource : Illustrationen},
year = {2025},
note = {Druckausgabe: 2025. - Auch veröffentlicht auf dem
Publikationsserver der RWTH Aachen University; Dissertation,
RWTH Aachen University, 2025},
abstract = {As part of the expansion of the local public transport, the
aim is to increase the frequency of rail services, which
means that the rails and particularly the wheels of rail
vehicles will be exposed to higher stresses than is
currently the case. From a mate-rials engineering point of
view, this represents a challenge, as the contact surfaces
between wheel and rail are considerably smaller than in road
vehicles. However, with loads of more than 1,000 MPa, the
loads acting on them are significantly higher than in road
traffic. The shape, size, and position of the contact
surface influence the rolling friction and thus the wear.
Simultaneously, the contact surface influences the
polygonization of the wheels. These relationships lead to
considerable research interest in determining the contact
area in terms of its size and shape for a more comprehensive
understanding of the wheel-rail contact with regard to wear
in modern rail vehicles. The evaluation of the contact area
can be done via analytical, experimental, or numerical
methods. In this research, the contact area is determined
using the numerical finite element analysis (FEA) with
subsequent knowledge-based experimental validation of the
numerical results. Pressure measurement films and carbon
paper combined with conventional paper are suitable for the
experimental determination of the contact surfaces. The
corresponding intermediate layers lead to a changed contact
situation, which has to be implemented simulatively. The
simulative consideration of these intermediate layers and
the required material models are the starting point of this
work. Initially, material models were developed for three
single-layer pressure measurement films and for carbon paper
in combination with conventional paper. The basis for
determining the material models of the pressure measurement
films was results of experimental investigations of a
spherical body with a flat plate. Based on the results of
these investigations, elasto-plastic material models were
developed, which were afterwards not transferable to the
wheel-rail contact. Subsequently, linear-elastic material
models were developed for three types of pressure
measurement film. A simplified material model was
mathematically derived for carbon paper in combination with
conventional paper, as no experimental results were
available from prior investigations with spherical bodies
and plates. The linear-elastic material models for carbon
paper and pressure measurement films were extended by
pressure-overclosure curves, which took the surface
roughness of the wheel-rail contact into account. To
validate the material models, a test rig was developed at
the beginning of this research, which was used to
experimentally generate impressions of the wheel-rail
contact. The experimental and simulative investigations
comprehensively demonstrated that pressure measurement films
and carbon paper are suitable as a valid measuring medium
and can be validly mapped via simulations. Carbon paper
combined with conventional paper can be used in the same way
as pressure measurement films to detect the wheel-rail
contact situation.},
cin = {414210},
ddc = {620},
cid = {$I:(DE-82)414210_20160101$},
pnm = {DFG project G:(GEPRIS)273675311 - Bestimmung der
Messgenauigkeit von Druckmessfolie im Rad-Schiene-Kontakt
(273675311)},
pid = {G:(GEPRIS)273675311},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2025-05813},
url = {https://publications.rwth-aachen.de/record/1013945},
}
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