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The detailed analysis of the tire loading and the subsequent deformations under operational driving conditions is of great importance for the basic investigation of the functionability as well as for the input and verification of the computer simulation of tires. Such data are also required for the definition of mission profiles as well as for the derivation of programs for the durability approval. The principles for the measurement of global tire deformations by spring loaded deflection transducers arranged in-between the tire crown and the rim are described. By combination of those sensors with wheel force transducers the determined tire deformations are referred to the actual service loading conditions. The sensors and transducers are described and examples of field measurement on heavy truck tires under distinguished driving conditions are presented.

The durability approval of truck axles is performed on proving grounds with well defined road characteristics as well as in laboratory test facilities simulating these loading conditions. These proof out tests are supposed to reproduce within a reasonable time the customer usage conditions which are expected during the life of a vehicle taking into account the large scatter of service. The programs and requirements are based on extensive measurements as well as long term experience. However, the development of vehicles for specific mission profiles as well as the introduction of components from new light weight material and innovative manufacturing technologies with different durability properties, requires procedures for the evaluation of the programs themselves. Within this paper the procedure of a comparative damage evaluation of test track and laboratory test programs with respect to an appropriated mission profile is demonstrated as example on a truck axle.