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 | Examinador Interno |
| CHERLIO SCANDIAN | Presidente |
| GUILHERME FABIANO MENDONCA DOS SANTOS | Coorientador |
| ROBERTO MARTINS DE SOUZA | Examinador Externo |
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.
