A new disbonded interface model and a finite element procedure have been developed to calculate the stress distributions of the adhesive joints with imperfectly-bonded interfaces under tensile loading. The finite element modeling of the weakened strength of the disbonded interfaces is accomplished by a new line element and a spring element. The finite element procedure consists of a new modeling technique for assessing the effects of disbonded interfaces on the stress fields of adhesive joints. The results for this work can be used as a basis for the development of the bonded joint reliability prediction method and accept/reject inspection criteria.

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