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Material Properties for Elastomers in Solidworks?

Question asked by John Willett on Oct 17, 2013
Latest reply on Oct 30, 2013 by Jared Conway

I'm having difficulty modeling a right-circular-cylindrical, silicone-rubber bushing bonded on both disk faces, possibly because I don't understand how to enter mutually compatible material properties or possibly because SolidWorks is having difficulty computing stress/strain solutions for soft, essentially incompressible elastomers.  Here are the "stiffness" parameters I'm using in psi:


Elastic Modulus in X (I assume this means Young's modulus):  210

Poisson's Ration (sic.) in XY: 0.499

Shear Modulus in XY: 70.1


The results I get depend strongly on the density of nodes in the bushing.  For example, with only 3 layers of nodes axially (many more transversely) I get shear essentially the same as predicted by a semi-empirical formula I looked up and compression within about a factor of two of the corresponding formula.  For much higher density of nodes, however, I get orders of magnitude smaller shear and compression for the same applied forces.  Any thoughts? -- John Willett



P.S. -- If you only specify two of the three "stiffness" parameters (actually there are four, counting the bulk modulus -- say you specify Young's modulus and Poisson's ratio, leaving the shear modulus blank), does SolidWorks automatically calculate the missing one from the two available analytical formulae, or what?  It still seems to run... -- J.W.