Structural stress or strain approach for seam-welded joints

2006 ◽  
Keyword(s):  
Welded Joints ◽  
Structural Stress

Advanced Local Concepts for Assessing the Fatigue Durability of Welded Joints

2007 ◽  
Vol 348-349 ◽  
pp. 565-568
Author(s):  
C.M. Sonsino ◽  
D. Radaj ◽  
W. Fricke
Keyword(s):  
Fracture Mechanics ◽  
Welded Joints ◽  
Thin Sheet ◽  
Plate Thickness ◽  
Lap Joints ◽  
Structural Stress ◽  
Notch Stress ◽  
Weld Toe ◽  
Mechanics Concepts ◽  
Weld Root

Some recently developed variants of local concepts for assessing the fatigue strength and structural durability of welded joints are reviewed. These comprise structural stress, notch stress or strain and fracture mechanics concepts. New variants of the structural stress concept are Dong’s gradient stress approach and Xiao-Yamada’s ‘one millimetre stress’ approach. FE meshing rules have been developed for welded joints in thin sheet structures. The concept of fictitious notch rounding is now better substantiated for aluminium alloys. The small-size notch concept is applicable to thin sheet lap joints. The new notch stress intensity factor concept is based on the singular stresses at the sharp weld toe notch. Advanced fracture mechanics concepts combine crack initiation at the seam weld root or nugget edge and crack propagation over the plate thickness resulting in endurable FK values as function of cycles per unit thickness, N/t.

scholarly journals A Study of the Thickness Effect using Structural Stress Approach for Fillet Welded Joints

2014 ◽  
Vol 32 (2) ◽  
pp. 37-42 ◽  
Author(s):  
Wen-Jie Xin ◽  
Dong-Jin Oh ◽  
Myung-Hyun Kim
Keyword(s):  
Welded Joints ◽  
Thickness Effect ◽  
Structural Stress

scholarly journals A notch stress method for fatigue life prediction of spot-welded joints

2019 ◽  
Vol 300 ◽  
pp. 19003
Author(s):  
Changjian Wei ◽  
Hong Tae Kang
Keyword(s):  
Fatigue Life ◽  
Welded Joints ◽  
Life Prediction ◽  
Structure Design ◽  
Fatigue Life Prediction ◽  
Local Geometry ◽  
Structural Stress ◽  
Lap Shear ◽  
Notch Stress ◽  
Spot Welded

Spot-welded joints are widely used in the construction of vehicle structures and frequently become critical locations for fatigue failure. Hence, it is essential to have reliable fatigue life prediction method for the spot-welded joints during vehicle structure design. In this paper, a new notch stress approach is developed for fatigue life prediction of the spot-welded joints. Currently, structural stress methods are widely used in automotive industry for fatigue life prediction of spot-welded joints. However, these methods are not well considering local geometry information. This paper introduces a notch stress based method to overcome the limitation of the structural stress methods. In the notch stress method, stress concentration factors for spot-welded joints are calculated from stress intensity factor equations. Then, the notch stress method is validated with fatigue test results of lap-shear and coach peel specimens.

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