Highlights DEM simulations reveal the flowing structure and stress distribution in the groove. A stress-coupling relation was proposed based on Janssen’s model. An analytical model including the stress-coupling effect was established. The stress-coupling effect makes the maximum conveying rate independent of gravity.

    Abstract In this paper, we study the conveying dynamics in the helical groove of an auger drilling into lunar simulant. We demonstrate that the stress-coupling effect of the conveyed granules by the groove of a drill auger plays a significant role on the dynamics of conveyance. For this, a discrete element method (DEM) is adopted first to uncover the motion and the stress characteristics of conveyed granules in a working auger. Then, a simplified dynamic model following the stress characteristics of DEM is established. The simplified model can not only reflect the results by the discrete element method, but can also explain well the proportional relationship between the maximum conveying rate and the rotating speed of the auger in the experiment (Zhao et al., 2019).


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    Titel :

    Invariance of conveying capacity for drilling into lunar soil simulant


    Beteiligte:
    Chen, Tao (Autor:in) / Zhao, Zhen (Autor:in) / Schwartz, Stephen R. (Autor:in) / Liu, Caishan (Autor:in) / Wang, Qi (Autor:in)

    Erschienen in:

    Advances in Space Research ; 64 , 9 ; 1816-1824


    Erscheinungsdatum :

    2019-08-01


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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