Design of the Railway Wheel Essay

1093 Words 5 Pages
INTRODUCTION

1.1 Introduction

In designing a railway wheel, the important thing that must be considered is material used. Choosing the right material will give a better result to the performance and the condition of the wheel. It is believed that most of the problems that occur to the railway wheel are the result from the thread braking, which is known as non-uniform heating. Thermal loading has the ability to initiate cracks, increase the crack growth rate and also reverse the residual stress in the rim. For the railway operation, there are two types of braking that involves in the operation which are stop braking and drag braking. Stop braking is used during the emergency time. Another one is drag braking, used to slow the train over a
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INTRODUCTION

1.1 Introduction

In designing a railway wheel, the important thing that must be considered is material used. Choosing the right material will give a better result to the performance and the condition of the wheel. It is believed that most of the problems that occur to the railway wheel are the result from the thread braking, which is known as non-uniform heating. Thermal loading has the ability to initiate cracks, increase the crack growth rate and also reverse the residual stress in the rim. For the railway operation, there are two types of braking that involves in the operation which are stop braking and drag braking. Stop braking is used during the emergency time. Another one is drag braking, used to slow the train over a long distance, to ensure that the speed is under the control. In stop braking condition, thermal fatigue cracks will initiate and propagate while under the drag braking condition, an extreme thermal input occurs which can fracture the wheel. When the brakes are applied for long periods of time, it will cause the heating of the thread and rim of the wheel, generated by frictional forces. Observation of the railway wheel has been made based on the wheels in Keretapi Tanah Melayu (KTM) Padang Besar, found that there is no crack occur except the scratch. This also happens due to the braking. Aside from friction heat result from the brake application, crack may also initiate and propagate due to the impact load that has been applied to the

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