Highlights ► Thrust of a driving device equals its net traction plus external rolling resistance. ► Thrust is associated with backward displacement of traction elements. ► CS approach: displacement on soft ground starts as horizontal compaction of soil segments. ► At transitional displacement (TD), the segments fail in shear and are forced to slide. ► Double plate meter technique: TD on common soil depends on size and load of a traction element.

    Abstract Every element of a pulling traction device (e.g. track shoe with grouser or tire section with lug) exhibits increasing rearward displacement during its engagement with soft ground. Compression–Sliding (CS) approach states in agreement with experimental evidence that on common soft ground this displacement starts due to longitudinal soil compression by the grouser or lug, which steadily increases up to the transitional displacement when the soil segment beneath a driving element fails in shear. Further displacement of a driving element is marked by forced slide of a sheared off soil block, which may eventually collapse. There was justified reasoning that the transitional displacement depends not only on the grouser (lug) contact pressure but also on the area and load of the respective traction element. The presented article reports on experiments designed to test this premise. The measurements applying the novel double plate (DP) meter technique were carried out in a laboratory soil bin containing loam charge of uniform bulk density and moisture content. Three sizes (proportions 1:2:4) and two mean vertical contact pressures (ratio1:2) of DP meter main plate were tested. The analysis of performed experiments confirmed the existence of dimensional and loading relationship “main plate – transitional displacement”, which bears upon the evaluation of thrust–slip relationship of any traction device by the CS approach or by any other method observing the existence of displacement.


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    Title :

    Compression–Sliding approach: Dependence of transitional displacement of a driving element on its size and load


    Contributors:

    Published in:

    Journal of Terramechanics ; 48 , 5 ; 325-332


    Publication date :

    2011-06-11


    Size :

    8 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English