Design Strategies of Test Codes for Durability Requirement of Disk Brakes in Truck Application

Durability requirements for disk brakes in truck application are improved based on the actual customer usage. A second moment reliability index is used to design test codes for the assessment of variable amplitude disk brake fatigue life. The approach is based on the mean estimates of logarithms of equivalent strength of the brake and customer load variables. The index gives possibilities to take all uncertainties in the fatigue life assessment into account, including scatter in material, production, and usage but also systematic errors like model errors in test set up, stress calculations, damage hypothesis, as well as statistical uncertainties.