Abstract
This paper presents a method for estimating the fatigue life of the air-spring, used in truck-cab suspension. Experimental fatigue data, together with finite element analysis data, was used to form the stress life ( S– N) curve. Experimental data was obtained from several accelerated experiments using constant load amplitude. Finite element analysis was used to describe the stress–strain conditions in the air-spring’s bellows. Stress tensors gained by FE analysis were exported and used to calculate equivalent uni-axial stresses, using the critical plane approach. To calculate the fatigue life of the air-spring the Palmgren–Miner linear damage hypothesis was used. The same hypothesis was also used to transform linear loading spectrum to constant amplitude load spectrum.
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