Abstract
The large deformation and ultimate properties of gelatin and agarose gels were investigated, in simple tension, as a necessary preliminary to an examination of mixed bipolymer gel systems. The underlying structure of these systems is sufficiently similar in certain respects to that of a ‘rubber-like’ network, to suggest that an analysis along these lines might be fruitful. It is found that under tensile test conditions, the factorization of strain and time dependence appears to be valid over all experimental conditions encountered. Modulus values from the initial slope of stress/strain curves confirm previously derived modulus/concentration relationships. Doubly logarithmic plots of stress at break against strain at break (‘failure envelopes’) provide a means of comparing ultimate properties as a function of polymer concentration. Since both break stress and break strain exhibit strong dependence on strain rate, minimum observed values of these quantities have been chosen to characterize the failure process.
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