Tyre - Soil Interaction

<p>What is Tyre soil Interaction &amp; why this study is important for designing tyre?</p> <p>Agriculture &amp; OTR tyres should satisfy many different requirements, such as</p> <ul> <li>To provide good traction performance,</li> </ul> <p>(Traction, or tractive force, is the force used to generate motion between a body and a tangential surface. If we consider the body as our tyre and the tangential surface is similar like road. In that case the reaction force of the road or may be soft soil will play a good role in traction performance.</p> <ul> <li>To limit soil shrinkage and compaction, and</li> <li>To guarantee good comfort level, avoiding high vibrations transmission to the driver seat.</li> </ul> <p>The achievement of all these requirements is strongly dependent on tread design, and of course also on soil properties.Some consideration is there,</p> <p>As shown in the slide the first one is inflated but the load not applicable that&rsquo;s why no deformation is shown in the soil area which one is marked as soft soil in the figure where as in the second figure vice versa, Means the tyre is rolling and load is applied that&rsquo;s because the clear deformation is shown.&nbsp;</p> <p>In general terms we can call this one is the fluid structure interaction or FSI problem where water as a liquid with tyre which we can consider a structure .&nbsp;</p> <p>All the simulations has been done through commercial software Abaqus and hypermesh .</p> <p>Hypermesh is used for pre-processing and Abaqus has been used as a solver and post processing purpose. We have used YEOH&nbsp;material model for hyper elastic behaviour. Because of water we considered the viscoelastic properties as well.</p> <p>Visualization of material instances is based on output variable&nbsp;EVF, the Eulerian material volume fraction. Output variable&nbsp;EVF_SOIL 1 measures the amount of SOIL instance within an element as a relative fraction. An&nbsp;EVF_SOIL 1 value of one (1) indicates that the element is completely filled with the specified material instance; an&nbsp;EVF_SOIL 1 &nbsp;value of zero (0) indicates that the element is completely devoid of the specified material instance.</p> <p>As you can see the picture and the value of EVF_SOIL-1 is varying from 1.0 to 0.0 , so the entire red portion you can see the soil or Eulerian material as discussed in earlier slide and in spite of red colour the tyre interaction part with soil.</p> <p>1. The entire red portion you can see the soil or Eulerian material as discussed in earlier slide.</p> <p>2. The tyre tread imprint is showing in the picture how soil is pressurised by the tyre.</p> <p>SVAVG,Mises: The Stress components, computed as a volume fraction weighted average of all materials in the element of the whole model</p> <p>Status of element (material failure with progressive damage, shear failure model, tensile failure model, porous failure criteria, brittle failure criteria model and VUMAT) .The STATUS of the model is 1.0 if the element is active ,0.0 if the element is not active.</p> <p>As you have seen the STATUS shows 1.0 in this model , the element is active . This one is an unique parameter of TYRE &ndash; SOIL interaction.</p>