Joint tests in shear

The traditional view of lap joint failure is old and familiar and was, in essence, employed by Fairbairn(36) who considered the failure mode of riveted joints on iron bridges. However, the topic of bonded lap shear joints is probably best reviewed in detail by 

Joint type Description/ standard Overlap length (mm) Adherend thickness (mm) Average shear stress at failure (MN m )  

Gritblasted steel adherends ( indicates silane-primed) 

Joints cured and tested at about 20 C Bondline thicknesses of the order of 0.65 mm 

Lap joint tests conducted to yield a rate of shear strain of about 1.0/minute, except for Ref. 87 double lap specimen A adhesive failure C cohesive failure 

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