Bottom stresses of static packing of granular chains

Abstract

h i g h l i g h t s• Bottom stress of a granular chains column is measured precisely and reproducibly.• Scaling behavior of the stress saturation curves agrees with the Janssen model. • Saturation mass is shown as a nonmonotonic function of the chain length.• A transition of the saturation mass is found at the persistence length of chains. • Entanglements as a possible explanation for nonmonotonic behavior are presented. a b s t r a c tWe experimentally measure the static stress at the bottom of a granular chains column with a precise and reproducible method. The relation, between the filling mass and the apparent mass converted from the bottom stress, is investigated on various chain lengths. Our measurements reconfirm that the scaling behavior of the stress saturation curves is in accord with the theoretical expectation of the Janssen model. Additionally, the saturation mass is displayed as a nonmonotonic function of the chain length, where a distinguishing transition of the saturation mass is found at the persistence length of the granular chain. We repeat the measurement with another measuring methodology and a silo with different size, respectively, the position of the peak maintains robust. In order to understand the transition of the saturation mass, the friction coefficient and the volume fraction of granular chains are also measured, from which Janssen parameter can be calculated. Finally, we preliminarily measure the bottom stress for two distinct packing structures of long chains, find the effect of the entanglements on the bottom stress, and argue that the entanglements might be responsible for the transition of the saturation mass.

Bouncing behavior and dissipative characterization of a chain-filled granular damper

“…The case L = ∞ corresponds to the absence of the baffle. The semi-rigid chains inside the container are composed of hollow, steel balls and steel rods, which are similar with those used in previous work [14,17]. The rod, as a link connecting balls, is not fixed, but rather retractile.…”

Column to pile transition in quasi-static deposition of granular chains

“…29,30 Flexible granular chains are therefore considered a model system for polymeric chains just as colloids are thought of as giant atoms. [31][32][33][34][35][36] While most studies focus on the column collapse and packing of these chains, a quasi-static measurement of the repose angle is missing despite its significance. 28,35 Here, we investigate the mechanism of repose of granular chains through a series of experiments.…”

Fiber-reinforced concrete for the flat bottom of silos

“…Studies have been conducted with reference to the determination of pressures acting on flat bottom silos (Diniz & Nascimento, 2006;Balevičius et al, 2011;Gallego et al, 2011;Rotter & Sadowski, 2012;Nascimento et al, 2013;Lopes Neto et al, 2014;Wen et al, 2015;Horabik et al, 2016;Wang et al, 2016;Pieraccini et al, 2017;Frank et al, 2018). However, there is a need for studies on the use of new materials for the flat bottom of these silos, which are elements subject to dynamic, often non-uniform loads.…”