Concluding remarks

Proper design of bonded joints requires an appreciation of the properties of the different materials to be joined as well as quantitative data on the properties of structural adhesives. In joint design, full account must be taken of the poor resistance of adhesives to peel and to cleavage forces; shear strength itself is unlikely to be a limiting factor. Therefore, a way forward might be to sacrifice some shear strength for high toughness and peel strength, such as that obtainable with flexible or toughened epoxies.

To limit the effects of creep under sustained load, an adhesive possessing a glass transition temperature, Tg, well above the service temperature is required. The use of such an adhesive should also result in the improved environmental durability of the bonded assembly.

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