Name: JOÃO VÍTOR RAIMUNDO SILVA E SILVA
Publication date: 16/08/2023
Advisor:
Name |
Role |
|---|---|
| CHERLIO SCANDIAN | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| ANTONIO CESAR BOZZI | Internal Examiner * |
| CHERLIO SCANDIAN | Advisor * |
Summary: Tribology encompasses the study of phenomena related to friction, wear, and
lubrication of surfaces in contact and in relative motion. Sliding wear is an important
issue in various sectors, such as the contact between wheel and rail in railway
systems, WHERE pure sliding can occur during curves. Laboratory pin-on-disc tests are
widely used to investigate this type of wear but have limitations in terms of time and cost. Computational simulations using the Finite Element Method (FEM) have been
studied as an alternative to avoid the need for these tests, but they face challenges in
terms of high computational cost and simulation time. In this context, the present
study evaluates the accuracy and speed of the semi-analytical computational method
GIWM (Global Incremental Wear Model) in predicting wear in pin-on-disc tests on
wheel-rail materials under different environmental and lubrication conditions found in
railways. Experimental data with normal loads of 5 N and 300 N were used to
calibrate the computational model with respect to wear depth and wear rate,
respectively. From this calibration, a dimensional wear coefficient (m³/N.m) was
computationally determined for each situation, which was employed to predict both
the total wear depth and wear rate of these tribosystems. The results of this prediction
were compared with the experimental results. It was observed that the GIWM method
showed good agreement with some of the experiments. Additionally, the algorithm
proved to be computationally efficient, with negligible simulation time compared to the
experiments and FEM simulations reported in the literature. It was concluded,
therefore, that the GIWM method can reduce the need to perform pin-on-disc tests
with variation in the applied normal load for wheel-rail system materials, as long as the
experimental conditions do not cause severe variations in the predominant wear
mechanisms, friction force, and wear intensity throughout the test.
Keywords: Tribology; Wheel-rail; Sliding wear; Archard`s law; Pin-on-disc; Computer
simulation; GlobaI Incremental Wear Model.
