7.1.4 Adhesive/Cohesive (Mixed) Failure

This failure, a combination of both adhesive and cohesive failures, is normally expressed by the presence of adhesives on the bonded surface of both respective substrates. At the same time, cohesive failure will be present on both surfaces of the respective substrates. In this failure mode, the cohesive strength and adhesion strength are well balanced, resulting in a combination failure.

Figure 211 Adhesive and cohesive mixed failure

7.2 A Practical Guide to Troubleshooting

There are many reasons why an adhesive might fail for a particular joint; therefore, while the list below is not necessarily comprehensive, at least one of the items listed is likely to be evident in any given failure.

Failures can be categorised into four main areas:

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