Effect of Bonded Insert Shape and Adhesive Thickness on Critical Stresses in aLoaded Plate

摘要

This report presents the results of finite element analyses conducted tocalculate the magnitude of adhesive stresses for a large plate with a bonded insert, and study the interaction of key parameters including (1) insert shape, and (2) adhesive modulus and thickness, with maximum plate stresses. Results are presented for circular, oval and elliptical insert cases. It is shown that changing the key variables can improve the efficiency of such repairs, however due to typically high adhesive stresses, careful consideration must be given to the level of applied loading and the design of the insert chosen. In general, for a particular shape of reinforcement, there is a trade-off between plate and adhesive stress magnitudes. This relationship is such that minimizing adhesive stresses (through increasing adhesive thickness or reducing adhesive modulus) reduces the beneficial effect on plate stresses of the bonded reinforcement. It is shown that for circular inserts this relationship is essentially linear.