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ASSESSING ADHESIVE BOND FAILURES: MIXED-MODE BOND FAILURES EXPLAINED

Posted on 6/29/2012 9:12:13 AM By Maxwell James Davis & Andrew McGregor
  

This paper explains the mechanisms of formation and degradation of adhesive bonds, and how a degrading interface can cause a transition from a strong bond which fails by cohesion to a weak bond which fails by adhesion. Importantly, the mechanisms proposed also explain mixed-mode failures and the implication of these failures to the strength of adhesively bonded structures.

The paper discusses the impact of adhesion and mixed-mode failures on the regulatory framework for certification and continuing airworthiness management of adhesive bonded aircraft structure. It outlines the difficulties in quantifying mixed-mode failures and how a lack of understanding of this failure mode has led to erroneous findings.

A methodology is proposed which has the potential to prevent adhesion and mixed-mode failures from occurring.


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