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When developing a new vehicle, the prescribed fatigue criteria must be met in all important structural nodes of the vehicle bodywork. Maximum stress amplitudes (stress ranges) must be lower than permissible values when the vehicle crosses significant road unevenness. The development stages are: 1) projecting and design of vehicle; 2) investigation of vehicle function sample on test stand; 3) measurement of vehicle prototype. In case the prescribed condition is not fulfilled, it is necessary to recommend a modification of the vehicle bodywork. In any case, it is necessary to know the fatigue properties for various structural and technological variants of the body sections. These properties can be determined in advance by laboratory fatigue tests. The paper describes the assessment of fatigue life in successive phases of vehicle development and presents the results of fatigue tests of several variants of welded nodes used in body constructions.

Practical notes for assessing the fatigue life of bodyworks of buses and trolleybuses