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Technical Brief

On the Source of the Systematic Error of the Pressure Measurement Film Applied to Wheel–Rail Normal Contact Measurements

[+] Author and Article Information
Jagoba Lekue

Chair and Institute of Rail Vehicles and Transport Systems,
RWTH Aachen University,
Seffenter Weg 8,
Aachen 52074, Germany
e-mail: lekue@ifs.rwth-aachen.de

Florian Dörner

Chair and Institute of Rail Vehicles and Transport Systems,
RWTH Aachen University,
Seffenter Weg 8,
Aachen 52074, Germany
e-mail: doerner@ifs.rwth-aachen.de

Christian Schindler

Chair and Institute of Rail Vehicles and Transport Systems,
RWTH Aachen University,
Seffenter Weg 8,
Aachen 52074, Germany
e-mail: schindler@ifs.rwth-aachen.de

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 2, 2017; final manuscript received July 15, 2017; published online September 25, 2017. Assoc. Editor: Sinan Muftu.

J. Tribol 140(2), 024501 (Sep 25, 2017) (4 pages) Paper No: TRIB-17-1045; doi: 10.1115/1.4037358 History: Received February 02, 2017; Revised July 15, 2017

This paper presents research activities regarding the systematic error of the pressure measurement film when measuring the area of the wheel–rail contact. In particular, an explanation for the different error values shown by the different film types was sought. A finite element model was created based on the assumption that not only the film, but also the microcapsules on top of it alter the results. The performance of the existing film models was enhanced by defining microcapsules with element failure and deletion behaviors. The new model was capable of reproducing the trend shown by the systematic error in the experiments. The simulation results confirmed that the measurement error of a certain film type is not only caused by the film itself, but also depends on the failure pressure and especially the diameter of the capsules.

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References

Figures

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Fig. 1

Analytical pressure distribution and experimentally determined radii of the contact patches

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Fig. 2

Cross sections of a monosheet film before (left) and after use (right)

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Fig. 3

Axisymmetric finite element model of the experimental setup: 1—Spherical contact body (coarse mesh); 2—Spherical contact body (fine mesh); 3—Contact body with flat surface (fine mesh); 4—Contact body with flat surface (coarse mesh); 5—Film; and 6—Microcapsules

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Fig. 4

Analytical pressure distribution, measured radii of the contact patches using the MS, HS, and HHS films (square, circle, and plus shaded symbols) and simulation results of the film models coated with capsules of yield stress 10 MPa, 50 MPa, and 130 MPa (square, circle, and plus unshaded symbols) and variable size (small, medium, and large sized symbols) for three representative cases: spherical bodies and applied forces of 300 mm and 25 kN (top), 450 mm and 50 kN (middle), and 600 mm and 100 kN (bottom)

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