Comparison of joint test geometries

To illustrate further many of the points discussed above it is of interest to compare the results from some of the test geometries that have been considered in the separate sections. 

As may be seen, the shear strength, Xf, is always less than the tensile butt joint strength, o-f, and the latter rises to much greater values for thin adhesive layers. However, the relative values of o-f, Xf and P depend upon the values of Ea, the intrinsic flaw size, a, and the local stress concentration effects. Ratios obtained with a particular adhesive/substrate combination will not therefore generally hold for others. 

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