Fracture toughness of wet and dry particulate materials comprised of colloidal sized particles: role of plastic deformation
Mitchell L Sesso, George V Franks
SOFT MATTER | ROYAL SOC CHEMISTRY | Published : 2017
This work demonstrates a method of measuring the fracture toughness of particulate materials comprised of colloidal sized particles over a wide range of saturation. Diametral compression of cylinders containing flaws of controlled length was used to measure the mode I fracture toughness. The effect of degree of saturation on the fracture toughness of slip cast ceramic grade alumina (d50 = 0.7 μm) was investigated. Dry powder compacts have significantly lower fracture toughness than when the powder compact is nearly fully saturated. All observations are consistent with the fracture mechanism being predominantly brittle for the dry samples but predominantly ductile in the nearly saturated samp..View full abstract
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Awarded by Australian Research Council
Thanks to the Australian Research Council for funding Discovery Project DP150102788. Thanks to Oktay Balkis and Kevin Smeaton for fabricating the moulds. Thanks to Yitong Sui for help with the experiments on calcium carbonate particles. Thanks to Anthony Stickland, Mahesh Tirumkudulu and Alex Routh for the stimulating discussions.