The fatigue life of hexagon head and socket head bolts, attached to vehicle a wheel, is assessed and the estimation of the residual life of existing bolts in vehicle wheel is investigated. Field-measured load histories were applied in this test. Tensile tests and fatigue tests were performed to evaluate the effect of tightening torque and to obtain the basic experimental data. A three-dimensional finite element analysis was also performed to evaluate the local stress fields. Miner's rule was used to predict the fatigue life of bolts. The results indicate the prediction of fatigue life of the bolts was in good agreement with the real life of vehicle wheel bolts in this test. By measuring the load history of the bolts and conducting a fatigue test, the fatigue life of bolts under real loading were as follows: 1) The fatigue life analysis of bolts using Miner's rule shows very good agreement with real bolt fatigue life. 2) As the tightening torques of bolts increased, the tensile strength decreased, but the fatigue life of bolts increased. 3) The torques loaded on a bolt were varied with the sequence of assembly; as a result, only the last assembled bolt satisfied the torques of design specification. So, much caution is needed in the assembling of bolts.
Fatigue life evaluation of vehicle wheel bolts under random loading
Bewertung der Ermüdungslebensdauer von Fahrzeugradbolzen bei zufälliger Belastung
Advances in Fracture and Strength, APCFS, Asian Pacific Conference on Fracture and Strength, 2004 ; 1770-1775
Key Engineering Materials ; 297-300
2005
6 Seiten, 7 Bilder, 5 Tabellen, 9 Quellen
Conference paper
English
Fatigue life under various random loading spectra
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