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Experimental measurements of the response of starch gels in uniaxial compression, under both lubricated and bonded conditions, are reported. With samples of initial height h//0 it was found for lubricated compression that true stress sigma versus strain plots (strain being defined as epsilon equals (h//0 minus h/h) were independent of h//0. The curves of true stress versus strain, for uniaxial compression of gels bonded to the instrument platens, lay well above the curve obtained in lubricated compression; and furthermore, the results in bonded compression were strongly dependent on h//0. The corrected curves for bonded compression were independent of h//0 and agreed with the response of the lubricated samples until near the failure point. Corrected stress for bonded compression at fracture increased with increasing h//0, while for lubricated compression, stress at fracture was constant or decreased with increasing n//0.

Uniaxial compression of bonded and lubricated gels / D.D. Christianson, E. Casiraghi, E.B. Bagley. - In: JOURNAL OF RHEOLOGY. - ISSN 0148-6055. - 29:6(1985), pp. 671-684.

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