Authors: Jonathan E Seppala Yoonae Heo Paul E Stutzman John R Sieber Chad R Snyder Kirk D Rice Gale A Holmes
Publish Date: 2015/07/29
Volume: 50, Issue: 21, Pages: 7048-7057
Abstract
Mechanical and thermal properties of Roma Plastilina Clay 1 RP1 were studied through smallamplitude oscillatory shear SAOS largeamplitude oscillatory shear LAOS and differential scanning calorimetry DSC supplemented with thermogravimetric analysis Xray diffraction and Xray florescence Rheological characterizations of RP1 through SAOS indicate that the clay composite softens as it is worked and slowly stiffens as it rests Upon heating the clay composite softens prior work history is erased and the composite undergoes a melting transition although melted clay is significantly stiffer when returned to the usage temperature Continuing mechanical characterizations into the LAOS or nonlinear region RP1 transitions from a transient network to a viscous shearthinning material as the temperature is increased Using the MITlaos framework RP1 exhibits intracycle strain stiffening and intracycle shear thinning at all temperatures
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