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The factors affecting joint strength, the different specimen types, and the properties actually evaluated by each type are discussed in detail. These properties are compared with the properties of a bonded joint which actually allow failure to take place. It points out that most methods presently used are empirical, and serious errors could be obtained in extrapolating this information to other materials or environments. The possibilities of predicting joint strength from basic material properties are discussed. The paper includes a discussion of the difficulties encountered in bonding titanium joints where the adherend strain is approximately twice that of steel or aluminum. These principles are incorporated into a method of analysis in which the shear modulus of the adhesive becomes very important.
Lunsford, Lee R.
Senior Structures Engineer, A Division of General Dynamics Corp., Fort Worth, Tex.