May 1, 2015 Thesis Open Access

Natnael Tesfamichael

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    <subfield code="a">Identification of the Best Material Combination Between Wheel and Rail of Railway Vehicle with Minimum Wear Rate</subfield>
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    <subfield code="a">&lt;p&gt;Wear is a natural phenomenon that exists when two bodies, which are in contact, perform&lt;br&gt;
a relative motion; this is also true for the wheel and rail of a railway vehicle. This wear is&lt;br&gt;
mainly dependent on the type of material they are made of. There is a tolerable level of&lt;br&gt;
wear that is safe to the railway operation. Once this critical wear level is reached, it is&lt;br&gt;
mandatory to re-profile the wheel, grind the rail. However, after some time it will be&lt;br&gt;
worn out to the level it can no more be used and the whole system must be replaced with&lt;br&gt;
a new one. This indicates that there is a need to focus on the wear properties of wheel and&lt;br&gt;
rail materials in order to secure a safe and sustainable railway operation.&lt;br&gt;
This research tries to set new combinations (pairs) of wheel and rail materials, simulate&lt;br&gt;
them for wear performance using a multi body simulation software (SIMPACK). An&lt;br&gt;
important criteria for the comparison is the hardness and strength of the wheel/rail&lt;br&gt;
materials. Then compare the wear rate of the different combination and identify for the&lt;br&gt;
best material combination with the minimum wear rate. Based on the simulation it is&lt;br&gt;
found that a softer wheel material rolling on a relatively harder rail material has a&lt;br&gt;
minimum wear rate. But increasing the hardness of both wheel and rails will not secure&lt;br&gt;
better wear performance. Safety is also considered in this research using the derailment&lt;br&gt;
coefficient parameter. Based on the minimum derailment coefficient value among the&lt;br&gt;
combinations those with better wear performance showed a better safety.&lt;/p&gt;</subfield>
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