Predicting strength of adhesive joints from test results

✍ Scribed by G. P. Anderson; K. L. DeVries

• Publisher: Springer Netherlands
• Year: 1989
• Tongue: English
• Weight: 489 KB
• Volume: 39
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00047449

✦ Synopsis

Using an average-stress criterion can lead to errors of an order of magnitude in predicted load carrying capability of a bonded joint. A fracture mechanics approach is shown to accurately predict failure load in a joint bonded with either a polyurethane or a relatively brittle epoxy when proper consideration is given to loading mode, temperature, and rate. The principal contribution of this paper is in extending fracture mechanics theory to regions where classical singular points do not exist. Analyses are combined with test data to deduce an "inherent" flaw size. It is shown that the combination of this inherent flaw size with the critical energy release rate can be used to predict strength in a variety of bonded joints.