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Author index ►Chung Fang, Yusin Lee, Chen-Ming Kuo, Yung-Jung Lin, Chuan Kuo

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Anti-thixotropic non-Newtonian fluid in complex conduct: gluing process simulation of railway ballast

Appl. Rheol.25:1 (2015) 14381 (7 pages) ►

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.► Cite this publication as follows:

Fang C, Lee Y, Kuo C, Lin Y, Kuo C: Anti-thixotropic non-Newtonian fluid in complex conduct: gluing process simulation of railway ballast, Appl. Rheol. 25 (2015) 14381.

In the present study, an evolution equation for the Cauchy stress tensor is proposed to take elastic, viscous and plastic characteristics of complex fluids simultaneously into account. In particular, hypoplasticity is incorporated to account for the plastic features. The stress model is applied to investigate time-dependent flows of an elasto- visco-plastic fluid driven by an oscillating boundary with/without an additional stationary boundary to study the cyclic responses and the model performance. Numerical simulations show that while different degrees of elastic and viscous effects can be captured by varying the model parameters, plastic deformation plays a significant role in the velocity distribution, and can be simulated appropriately by use of hypoplasticity. The stress model is capable of accounting for the combined elastic, viscous and plastic features of complex materials in transient motions, and applications may be found in geomorphic fluid motions like granular and debris flows, and flows involving polymers.► Cite this publication as follows:

Fang C, Lee C: Unsteady parallel flows of an elasto-visco-hypoplastic fluid with oscillating boundary, Appl. Rheol. 18 (2008) 45001.

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