Abstract
We have modelled the stress relaxation behaviour of silastic foams over a 5-year period. We have used relaxation data from tests at Los Alamos and other facilities. The model behaviour is consistent with data taken on such foams at the Allied Signal Plant in Kansas City, Missouri. Initial compression for these tests can be as high as 55%. Variability of the initial properties of the foams significantly influences the long term relaxation behaviour as these strains are high enough to be in the “lock-up” region of the compressive stress-strain curve.
We are incorporating a Rusch-like ageing model for silastic foams. The model includes the influence of initial strain, temperature and time. It allows for the development of permanent strains. We are also analysing models of incompressible polymers and rigid foams. We will attempt to incorporate Rusch-like ageing models for these materials also.
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References
Hibbitt, Karlsson, and Sorensen, 1998, ABAQUS/Standard User’s Manual, Volume I, section 10.5.2.
Hibbitt, Karlsson, and Sorensen, 1998, ABAQUS Theory Manual, section 4.7.2.
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© 2001 Springer Science+Business Media New York
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Lewis, M.W., Anderson, C.A. (2001). Modelling Aged Polymers with Finite Element Analysis. In: Mallinson, L.G. (eds) Ageing Studies and Lifetime Extension of Materials. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1215-8_51
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DOI: https://doi.org/10.1007/978-1-4615-1215-8_51
Publisher Name: Springer, Boston, MA
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