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Boundary Conditions in Solid Mechanics

Posted 16 feb 2015, 04:43 GMT-5 Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 4.2a 0 Replies

Cemre Ariyurek
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In COMSOL 4.2a, I am generating shear waves in a spherical glass phantom having agar-agar inside by rotating it around an axis (z-axis). Glass is defined to the layer of this spherical agar-agar, it is not a different geometry. Agar-agar has another small stiffer inclusion inside but same material. Thus, in overall I have two spheres, one being small (radius=2cm) and inside the big one (radius= 7cm) and big one has a layer with thickness 2mm defined as glass material, big sphere is defined as agar-agar, small sphere is defined as stiffer agar-agar (greater Young's Modulus). I am generating the rotation about an axis by using prescribed displacement (domain) assigned to the outer shell (glass), equations defined in spherical coordinates (prescribed displacement in phi direction =0.01*sys2.r*sin(sys2.theta), prescribed displacement in r and theta directions are not defined) .

At the boundaries (glass and agar-agar, agar-agar and inclusion), how can I see the boundary conditions simulation has been using? At the boundaries, for instance displacement/pressure/velocity which one of them is continuous? Normal or tangential component? I am trying to make a similar analogy to EM waves in boundary conditions. Could someone help please about boundary conditions in Solid Mechanics Module?

0 Replies Last Post 16 feb 2015, 04:43 GMT-5
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Hello Cemre Ariyurek

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