Stress distribution in adhesive joints with tapered laminates - Effect of tapering length and material properties
Artikel i vetenskaplig tidskrift, 2010
One major problem when using bonded fiber-reinforced plastic laminates
to strengthen and upgrade existing structures is the high stresses in the adhesive
layer, in the area close to the end of the laminate, which might govern the failure of
the joint. One method that has been put forward as a means of reducing the stress
concentration in this area, is to taper the end of the laminate. Although this method
has been suggested by some design guidelines, no specific information is usually
provided about the tapering type, required tapering length, and limitations associated
with this method. A parametric study has been carried out to investigate
the effect of tapering length and the material properties of joint constituents,
i.e., stiffness of the laminate and adhesive, on stress distribution in adhesive joints
using the finite element method. Two different configurations, including normal and
reverse tapering, were considered. The results indicated that the effect of tapering on
stress distribution is highly dependent on the stiffness of the laminate and the adhesive
used in the joint. It was concluded that tapering is more effective in joints with
softer laminates and stiffer adhesives. Reverse tapering was found to have more
favorable effects on stress reduction in comparison to normal tapering.
stress concentration
reverse
tapering
normal
FE
laminate