Non-Linearity of the Mirror Constant for Glasses Fractured in Flexure

查看全文 作　　者：[1]马凌越;DUGNANI [1]Roberto;MOULINS [2]Anthony 机构地区：[1]University of Michigan-Shanghai Jiao Tong University Joint Institute,Shanghai Jiao Tong University,Shanghai 200240,China;[2]Ecole de Technologie Superieure,Montreal,Canada 出　　处：《Journal of Shanghai Jiaotong university(Science)》索引2018年第23卷第1期,共8页 摘　　要：Fractography relies on topographic features on the fracture surfaces to deduce the stress state of the failed component. Traditionally, fractographers assumed that the fracture strength of brittle materials was related to the reciprocal of the square root of the mirror radius linearly, in accordance with the empirical equation formally postulated by Orr in 1972. In this manuscript a novel analytical model to describe the dynamic behavior of elliptical cracks was derived on the basis of thermodynamic principles. Unlike Orr's equation, the proposed model considered the effects of the plate thickness and it could be used to improve the strength prediction based on the plate's geometry and material properties. To verify the validity of the model, 39 annealed, 2 mm thick,soda-lime silicate glass plates were fractured by four-points bending test and the fracture surfaces were imaged by confocal laser microscope and carefully studied. Excellent agreement was observed between the experimental data and the proposed theoretical framework. 关 键 词：FRACTOGRAPHY flexural strength BRITTLE soda-lime silicate glass mirror constant