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Maximizing The Efficiency of Adhesive Joint Designs

SpecialChem / Oct 11, 2005

Non-uniform stresses within the adhesive joint can significantly reduce the maximum strength of the joint. Non-uniform stress distributions generally cannot be eliminated, but they can be reduced through proper joint design and selection of certain design variables. There are a large number of variables affecting stress distribution, even in the most common joint designs. The following are most important. 1. Adhesive Properties 2. Adhesive Thickness 3. Geometry of the Bond Area 4. Adherend Properties Figure 1 illustrates the non-uniform stress distributions that occur when an adhesive joint is subjected to shear or cleavage type loading. The effect of non-uniform stress distribution is that the average stress (i.e., the joint load divided by bond area) is always lower than the maximum stress at localized areas within the joint. Only in cases where a near uniform stress occurs does the average stress approach the maximum stress.Failure in the bond always begins at the maximum stress points.

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