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Effect of the granular material on the maximum holding force of a granular gripper

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Abstract

A granular gripper is a device used to hold objects by taking advantage of the phenomenon of Reynold’s dilatancy. A membrane containing a granular sample is allowed to deform around the object to be held and then vacuum is used to jam the granular material inside the membrane. This allows to hold the object against external forces since deformation of the granular material is prevented by not allowing the system to increase its volume. The maximum holding force supported by the gripper depends on a number of variables. In this work, we show that in the regime of frictional holding (where the gripper does not interlock with the object), the maximum holding force as a function of the penetration of the object in the gripper does not depend on the granular material used to fill the membrane. Results for a variety of granular materials can be collapsed into a single curve if maximum holding force is plotted against the penetration depth achieved. The results suggest that a robotic arm capable of sensing the penetration depth can use this master curve to estimate the maximum holding force at each gripping operation.

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Acknowledgements

We thank N. Arce and J. P. Cagnola from Universidad Tecnológica Nacional (La Plata) for their contribution in the design and test of the experimental apparatus. We are indebted to G. Corral and M. Baccin for their help during the experiments. This work has been supported in part by ANPCyT (Argentina) through grant PICT-2016-2658, UTN (Argentina) through grant PID-MAUTNLP-4415 and FCEyN-UNLPam through grant F-55.

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Author notes

  1. Angel A. Santarossa

    Present address: Institute for Multiscale Simulation, Universität Erlangen-Nürnberg, Cauerstraße 3, 91058, Erlangen, Germany

Authors and Affiliations

  1. Dpto. Física, FCEyN, Universidad Nacional de La Pampa, Uruguay 151, 6300, Santa Rosa, La Pampa, Argentina

    Julián M. Gómez–Paccapelo, Angel A. Santarossa, H. Daniel Bustos & Luis A. Pugnaloni

  2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina

    Luis A. Pugnaloni

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  1. Julián M. Gómez–Paccapelo
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  2. Angel A. Santarossa
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  3. H. Daniel Bustos
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  4. Luis A. Pugnaloni
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Contributions

JMGP and AAS have contributed equally to this work.

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Correspondence to Luis A. Pugnaloni.

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Gómez–Paccapelo, J.M., Santarossa, A.A., Bustos, H.D. et al. Effect of the granular material on the maximum holding force of a granular gripper. Granular Matter 23, 4 (2021). https://doi.org/10.1007/s10035-020-01069-z

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  • DOI: https://doi.org/10.1007/s10035-020-01069-z

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