Study of the mechanical behaviour of diaphragm films

A biaxial inflation experiment is presented to determine the biaxial properties of commercially available diaphragm materials. The pressure and deflection of the bubble are measured during testing. Extension ratios are determined after inflation. Results are presented for Upilex 125R film. A numeric...

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Bibliographic Details
Published in:Composites manufacturing 1991, Vol.2 (3), p.197-202
Main Authors: Monaghan, M.R., Mallon, P.J.
Format: Article
Language:English
Subjects:
biaxial tensile test
diaphragm forming
strain energy functions
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Summary:A biaxial inflation experiment is presented to determine the biaxial properties of commercially available diaphragm materials. The pressure and deflection of the bubble are measured during testing. Extension ratios are determined after inflation. Results are presented for Upilex 125R film. A numerical code is adapted to predict the deformations and extension ratios of the experiments. The code uses large deformation theory for incompressible isotropic elastic materials. Both the Mooney and neo-Hookean strain energy functions have been programmed into the code. The results from the code are presented and compared to experimental results where the polar extension ratio λ 2p is less than 1.5. Excellent agreement is found and an equal biaxial stress state exists in the polar region of the bubble.
ISSN:0956-7143
DOI:10.1016/0956-7143(91)90140-C