Accession Number : AD0783425


Title :   Development of Mathematical Model for Pneumatic Tire-Soil Interaction


Descriptive Note : Final rept.


Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE NY RESEARCH DEPT


Personal Author(s) : Karafiath, Leslie L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/783425.pdf


Report Date : Jul 1974


Pagination or Media Count : 199


Abstract : The role of tire deformation in tire-soil interaction is discussed, and a mathematical model is described that incorporates the qualitative relationships obtained from experimental data describing tire deformation as a function of the relative stiffness of the tire to the soil. The mathematical model assumes that the centerline geometry of tires consists of straight lines and logarithmic spirals and that there is a certain limit to the normal pressure that may develop beneath a tire. This limiting normal pressure is a tire property and is dependent on tire inflation pressure. Soil is modeled by its Coulomb strength parameters. Plastic equilibrium conditions in soil determine the interface stresses where the normal stress is less than the limiting normal pressure. Values of free parameters in the model that determine tire centerline geometry were analyzed.


Descriptors :   *INTERACTIONS , *SOILS , *TIRES , COHESION , COMPUTER PROGRAMS , MATHEMATICAL MODELS , SHEAR STRESSES , SOIL DYNAMICS , STABILITY , TRAFFICABILITY


Subject Categories : Soil Mechanics
      Surface Transportation and Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE