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Identifying critical tearing energy of polymer films

Posted: 03 Sep 2012 ?? ?Print Version ?Bookmark and Share

Keywords:Thin polymer films? semiconductor packaging? mechanical stresses?

Thin polymer films are finding growing interest in biological sciences and semiconductor packaging, along with their popular application as packaging materials. Researchers also show interest in studying mechanical stresses and fracture behavior in soft biological materials. In many of these applications, the films need to experience severe mechanical stresses during handling as well as actual usage. While most of these polymer films are durable under tensile stresses, they are very prone to failure upon tearing. Hence, it is quite important to know the critical energy release rate during fracture of these films for accurate material design.

A common technique to measure the critical fracture energy during fracture of rubber-like materials is trouser-tear test. This method got its name because the specimen for these tests consists of a rectangular sheet cut along its long axis to form a trouser shaped sample. The 'legs' of the trouser specimen are then pulled in opposite directions to create tearing action. Determination of critical fracture energy from other test methods requires accurate determination of crack length, whereas the critical energy release and rate of crack propagation during a trouser-tear test are independent of crack length and sample geometry.

View the PDF document for more information.

Originally published by Agilent Technologies Inc. at www.agilent.com as "Determination of Critical Tearing Energy of Polymer Films".





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