Weld-bonded joints offer a great potential for automotive designers to build save automotive structures. However, a method for predicting the deformation and fracture of weld-bonded joints has not yet been established. Cohesive-zone models exists only separately for the analysis of adhesively bonded joints and for the analysis of spot welded joints. In the present paper, these two separate models are combined to provide a design tool for weld bonding in which adhesive technology is combined with spot welding. FEM calculations on coach-peel- and single-lap-shear weld-bonded joints fabricated from 2 mm thick 5754-O Al-sheets were carried out. The incorporating cohesive-zone modeling have been shown to provide predictions for the deformation and fracture of weld-bonded joints. Implementation of this method requires that two cohesive-fracture parameters, the peak stress and toughness, be specified for each mode of deformation in each potential region of fracture. These parameters were determined from independent tests previously made on spot-welded and adhesively bonded joints. It has been shown that once the parameters have been established, they can be combined to predict the deformation and fracture of new weld-bonded joint geometries containing the identical spot weld and adhesive. Strengths, deformations, energy-absorption and failure modes are captured fairly accurately. The results indicate that the use of cohesive-zone models may have the potential to be a very useful approach for the design and analysis of weld-bonded joints.
Cohesive-zone modeling of the deformation and fracture of weld-bonded joints
Welding Journal, New York ; 83 , 4 ; 133S-139S
2004
7 Seiten, 5 Bilder, 1 Tabelle, 37 Quellen
Aufsatz (Zeitschrift)
Englisch
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