Effect of sample dimensions, lubrication and deformation rate on uniaxial compression of gelatin gels

摘要: The response of 10% gelatin gels to uniaxial compression is determined in part by frictional effects at the gel-platen interface. By using teflon-coated plates, lubricated with paraffin or silicone oil, these are effectively eliminated. stress-strain can then be described two-constant Mooney-Rivlin relation, sum two parameters (C1 +C2) being about 25% lower than value obtained simple shear and torsion. Cross-head speed (for total testing times 0.2–3 min) had no effect on material response, but long-term stress relaxation does occur over periods 30 min longer. Sample radius did not affect a major under unlubricated conditions. No systematic change was seen sample diameter height (aspect) ratios between 9.6 3.1 compression, data scatter for given worst lowest heights (highest aspect ratio). Agreement all true versus strain within ± 7% regardless deformation rate.