FEM study of fatigue response of 3-sheet spot welded joints
2006 (English)In: Steel Research International, ISSN 1611-3683, Vol. 4, no 77, 292-296 p.Article in journal (Refereed) Published
The commercial software used for predicting fatigue strength for load-carrying spot welds in sheet structures, like car bodies, is mainly developed for two-sheet joints. The purpose of this work was to study the fatigue properties of three-sheet spot welded joints with a dimensioning method used in the automotive industry and to compare such computational results to those obtained from a more accurate method and to experimental data. Eleven three-sheet, single spot welded specimens were studied using a structural stress approach, followed by shell element simulations, similar to those used in commercial software. These results were compared to calculations based on fine meshed solid element models. Fracture mechanics was used to evaluate the loading conditions at the spot welds. Comparison between the results from the different methods and experimental results for three shear loaded specimens, consisting of triple sheets, found in literature showed good correlation. The shell element method in shear loaded cases gives stress intensities within +35% to -5% of the solid element method results. In peel loaded cases the results differ up to -60%, an under-estimation that leads to an increase of estimated fatigue life up to 65 times.
Place, publisher, year, edition, pages
2006. Vol. 4, no 77, 292-296 p.
three-sheet spot welded joints, stress intensity factor, fatigue, fracture mechanics, FEM, design methods
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-47693ISI: 000237794000010OAI: oai:DiVA.org:kth-47693DiVA: diva2:456048
QC 201111142011-11-112011-11-112011-11-14Bibliographically approved