Hello,
I met a contact problem in my modeling. Basically I have a thin-walled container (modeled as rigid solid), within which I have a soft gel-like material in contact. Loading condition is to sudden shake the container (and thus the gel inside due to contact forces). Because the gel has a very large bulk modulus making it very incompressible, I have to use coarse solid tet10 mesh to model, in order to get a slightly larger stable time increment. Clearly, the rigid container will be master surface, and the gel outward surface will be the slave surface. Now the problem is that, if I use general contact, very often I see a few nodes will penetrate outside the container. If I use contact pair with *clearance option, fewer nodes will do so, but still there are some nodes penetrated through the thin-walled container, and goes outside, which is not at all physically sound.
Could anyone give me some hint what I might have done wrong, and what I can rectify? -- From abaqus manual, it says that I need to refine the slave surface mesh, but this is hard to do given our specific conditions, i.e., a high bulk modulus and we prefer to have coarse mesh of the gel.
BTW -- I use Abaqus V6.4 for the simulation.
Thanks very much, and appreciate any thoughts!
Sean
I met a contact problem in my modeling. Basically I have a thin-walled container (modeled as rigid solid), within which I have a soft gel-like material in contact. Loading condition is to sudden shake the container (and thus the gel inside due to contact forces). Because the gel has a very large bulk modulus making it very incompressible, I have to use coarse solid tet10 mesh to model, in order to get a slightly larger stable time increment. Clearly, the rigid container will be master surface, and the gel outward surface will be the slave surface. Now the problem is that, if I use general contact, very often I see a few nodes will penetrate outside the container. If I use contact pair with *clearance option, fewer nodes will do so, but still there are some nodes penetrated through the thin-walled container, and goes outside, which is not at all physically sound.
Could anyone give me some hint what I might have done wrong, and what I can rectify? -- From abaqus manual, it says that I need to refine the slave surface mesh, but this is hard to do given our specific conditions, i.e., a high bulk modulus and we prefer to have coarse mesh of the gel.
BTW -- I use Abaqus V6.4 for the simulation.
Thanks very much, and appreciate any thoughts!
Sean
