Article (Scientific journals)
Characterization and Modeling of Granular Jamming: Models for Mechanical Design
Blanc, Loic; François, Bertrand; Delchambre, Alain et al.
2020In Granular Matter, 23 (6)
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Keywords :
Sciences de l'ingénieur; Granular jamming · Triaxial testing · Analytical model · Tunable flexural stiffness · Mechanical design
Abstract :
[en] The use of granular jamming is proposed for designing structures with tunable rigidity of their tools (with the ability of being flexible devices for shaping and deformation but rigid for shape-locking and force transmission). The granular jamming consists in modifying the apparent rigidity of a structure by controlling the vacuum in a membrane filled with granular material. When the difference of pressure is low, the grains are free to move with respect to each other and the structure is flexible. When the vacuum in the membrane is increased, the grains are blocked and the structure is more rigid. Different mechanical characterizations of the granular jamming have been performed (triaxial compression and tension and cantilever beam bending tests) for different glass bead sizes ranging between 100 μm and 1 mm (used as granular material) at different vacuum levels (between 0 kPa and 90 kPa ). The grain size slightly influences the stiffness while the pressure difference is the main parameter to tune the stiffness of the structure. Based on these experiments, analytical models have been developed and validated. The tension characteristics can be directly deduced from the compression behavior and the bending modulus can be obtained by a combination of the tension and compression moduli. The proposed analytical models present the advantage of a simple formulation and are suitable for estimating the performance of other structures based on the granular jamming. The models can estimate and predict satisfactorily the results of granular jamming and can be used for designing mechanical structures based on this mechanism.
Disciplines :
Civil engineering
Author, co-author :
Blanc, Loic
François, Bertrand  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Delchambre, Alain
Lambert, Pierre
Language :
French
Title :
Characterization and Modeling of Granular Jamming: Models for Mechanical Design
Publication date :
2020
Journal title :
Granular Matter
ISSN :
1434-5021
eISSN :
1434-7636
Publisher :
Springer, United States - Delaware
Volume :
23
Issue :
6
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 April 2022

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