Fatigue strength is an interdisciplinary science, involving interaction between load, manufacture, material and design. 

Automotive engineers must therefore be aware of the load imposed upon a vehicle and/or its components, including any ‘unusual events’, in order to estimate the fatigue strength mathematically and by experiment. 

The mechanical characteristics of the materials and the manufacturing quality of the components represent the input data required to measure the fatigue strength of the components. To estimate structural durability mathematically, design details of the component are also required.