Chung Fang, Yusin Lee, Chen-Ming Kuo, Yung-Jung Lin, Chuan Kuo
Anti-thixotropic non-Newtonian fluid in complex conduct: gluing process simulation of railway ballast
Appl. Rheol. 25:1 (2015) 14381 (7 pages)Abstract: An elasto-visco-plastic model of the Cauchy stress is proposed for gluing solution of railway ballast, with an asymptotic timedependent viscosity accounting for the anti-thixotropic and shear-thickening features. Flow characteristics and time-dependent solidification of the gluing solution in the multiconnected conducts spanned by the gravels, accomplished by the algorithm in generating a ballast consisting of convex octahedral grains, are simulated by using the ANSYS™ package. While different vertical penetrations of the gluing solution can be achieved by using different characteristic times scales of the asymptotic time-dependent viscosity, the lateral extension is rather limited and local. Pouring gluing solution into ballast tends to create more concrete adhesion between the gravels vertically, while concrete lateral adhesion can be obtained by spreading gluing solution onto ballast. The present study provides an integrated method for the estimation of the gluing solution distribution in a ballast, and for optimal layout of the gluing solution arrangement a priori gluing practice. © 2015 Applied Rheology.
DOI 10.3933/ApplRheol-25-14381
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