Approximately 60 000 tonnes of tyres are produced annually in Sweden to meet thedemand in the market. It is believed that 10 000 tonnes of rubber particles contaminatesthe Swedish roads every year. Some of the elements in the emitted particles cannegatively impact the environment. These elements can lead to leaching in water thatcan cause serious problems to aquatic organisms. Furthermore worn out tyres negativelyinfluence the driving dynamics. It increases the risk of aquaplaning which can have fatalconsequences. Innovative ways of recycling tyres are constantly being developed butstill faces major challenges. It is therefore important to understand tyre wear, whatinfluences it and how to reduce it. The aim of the project is to acquire knowledge related to tyre wear, its environmentalimpacts, use a mathematical model to simulate tyre wear and study how the differentparameters influences wear. First a literature survey was performed to acquire knowledge related to tyre wear. It wasfound that tyre wear is mainly due to adhesive and hysteresis wear. Several factors werefound to affect tyre wear for example velocity, slip angle and the type of road surface.The environment impact was also studied and the results show the composition of theparticles emitted to the environment. Some of the emitted particles negatively affect theaquatic organism and human beings. In the second part of the project a mathematical model based on the well-known brushtyre model was used to simulate how wear changes with different parameters. Themodel created at KTH Vehicle Dynamics is named the expanded brush tyre model(EBM). The wear model chosen for this evaluation was the Archards wear law. Thismodel was used to be able to quantify wear and study how it is influenced by differentfactors. The result of the mathematical models shows clearly an exponential increase in thevolume of wear with increases in velocity, slip angle and vertical load. The analysis wasdone using zero camber angle. For future work it is recommended to investigate camber angle as it is also one of themajor factors that affects wear. Temperature is also another factor that was not taken into account in the study. It can also be studied in future work.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kth-173725 |
| Date | January 2015 |
| Creators | Mohammadi, Mahdi, Ngeno, Ray |
| Publisher | KTH, Fordonsdynamik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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