Abstract:
The fracture mechanics of the Blister Test has been investigated with a view to refine the current experimental and analytical approaches. The test configuration involves the pneumatic detachment of composite specimens by propagating a crack rapidly along the polymer-substrate interface. Analytical models for the computation of fracture energy, using Blister Test, are based mainly on two types of energy storage modes: The bending mode for relatively thick elastic adherends (h/s 0.50), and the stretching mode for thin viscoelastic membranes (h/s ); h/a being the specimen thickness to blister debond radius ratio. It has been suggested that the stretching mode of deformation is the more likely mechanism, when debonding is conducted against the elastic retraction of an elastomeric membrane. The Premise has been verified by experimental data. The study reveals that the correct prescription of the critical fracture radius is a necessary preliminary for accurate prediction of the junction strength. This has been verified by experimental data in conjunction with an automated system which incorporates a digital camera to track the rate of blister growth. Apart from refining the current analyses, the presented work enable one to gain an insight into the energetics and the material parameters involved in the evaluation of composite fracture.
Page(s):
43-56
DOI:
DOI not available
Published:
Journal: Journal of Pakistan Institute of Chemical Engineers, Volume: 21-22, Issue: 1--2, Year: 1994