Error estimation in wheel-rail normal contact area measurements using pressure sensitive film / Jagoba Lekue.

Format:

Book

Author/Creator:

Lekue, Jagoba, author.

Language:

English

Subjects (All):

Thin films.

Thin films--Effect of radiation on.

Physical Description:

1 online resource (144 pages)

Edition:

1st ed.

Place of Publication:

Aachen : Apprimus Wissenschaftsverlag, [2022]

Summary:

This monograph presents a series of research activities with the goal of determining whether pressure measurement films are a suitable tool for a quantitative assessment of the wheel-rail contact area. Firstly, the effect of influential factors such as geometry, applied load and surface roughness on the resulting imprint was thoroughly examined by means of analytically approachable case studies. This allowed a precise determination of the systematic error that alters experimental outcomes. After that, finite element representations of the measurement procedure were explored in order to characterize the measurement deviation based on mechanical principles. By virtue of the excellent reproducibility of the measurement procedure, as well as the meaningful insight obtained from finite element simulations, an empirically calibrated film model that matches experimental outcomes was developed. This was alternately interposed between wheel and rail models to estimate the measurement error originated under typical operation conditions. The results underline the marked dependence of the measurement error on surface roughness but foresee a robust and reliable use of pressure measurement films for validation of wheel-rail contact models as long as both numerical and experimental solutions represent the same reality of interest.

Contents:

Intro

1 Introduction

2 State of the Art in Research and Industry

2.1 Normal Contact Mechanics

2.1.1 Hertzian Contact

2.1.2 Rough Contact

2.2 Finite Element Analysis

2.2.1 Nonlinear Approach

2.2.2 Dynamic Events

2.2.3 Implicit Integration

2.2.4 Normal Contact Formulation

2.2.5 Plasticity

2.3 Verification and Validation Procedures (V&amp

V)

2.3.1 Model Development

2.3.2 Error Sources

2.4 Wheel-Rail Contact

2.4.1 Wheel and Rail Profiles

2.4.2 Analytical Calculation

2.4.3 Numerical Simulation

2.4.4 Experimental Validation

3 Objective and Course of Action

4 Measurement Error in Smooth Contact

4.1 Experimental Measurements

4.1.1 Test Specimens, Experimental Setup and Procedure

4.1.2 Experimental Results Versus Analytical Predictions

4.2 Error Characterization

4.2.1 Basic Film Model

4.2.2 Enhanced Film Model

5 Measurement Error in Rough Contact

5.1 Experimental Measurements

5.1.1 Test Specimens, Experimental Setup and Procedure

5.1.2 Experimental Results

5.2 Error Characterization

5.2.1 Microscopic Contact

5.2.2 Macroscopic Contact

6 Film Model Calibration

6.1 Linear-Elastic Gasket Film Model

6.2 Sensitivity Study of Elastic Constants

6.3 Determination of Young's Modulus

7 Measurement Error in Wheel-RailContact

7.1 Steel-Steel Interaction

7.2 Wheel-Rail Contact Model

7.3 Error Evaluation

7.4 Adapted Validation Procedure

8 Summary and Outlook

Bibliography

A Appendix

A.1 ORE S1002 Wheel Profile

A.2 Film Cross Sections

B Publications

C Supervised Student Projects

D Curriculum Vitae.

Notes:

Description based upon print version of record.

Description based on print version record.

Other Format:

Print version: Lekue, Jagoba Error Estimation in Wheel-Rail Normal Contact Area Measurements Using Pressure Sensitive Film

ISBN:

9783985550920