{"id":403583,"date":"2025-01-05T15:54:47","date_gmt":"2025-01-05T15:54:47","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/403583\/"},"modified":"2025-01-10T23:22:52","modified_gmt":"2025-01-10T23:22:52","slug":"403583","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/403583\/","title":{"rendered":"Reply To: Help to do quasistatic analysis in static structural module"},"content":{"rendered":"

<p>The last model you shared uses a Static Structural analysis, but since you want to include Coupled Pore-Fluid Diffusion and Structural Model of Porous Media, you might want to select the Coupled Field Static analysis from the toolbox.  Read Chapter 2.12<\/a> to learn how to perform this type of analysis.<\/p><p>The material models supported in the coupled structural-pore-fluid-diffusion analysis include elasticity (isotropic, orthotropic and anisotropic), porous elasticity<\/a>, Mohr Coulomb<\/a> plasticity, Cam-clay<\/a> plasticity, jointed rock<\/a> plasticity, extended Drucker-Prager<\/a> and Drucker-Prager-based concrete<\/a> plasticity.<\/p><p>Porous elasticity<\/a> material can be defined with an Initial void ratio, which would be 0.45 to give you a solid volume fraction of 0.55<\/p><p>Note that Hyperelastic material models are not on the list of material that support pore-fluid diffusion. I don’t know where you want the pore-fluid diffusion to act, but you have used Hyperelastic materials such as Yeoh for Piamater and Duramater, Mooney-Revlin for Sclera and Neo-Hookean for Choroid. However, I find in Engineering Data, it does not complain if I add Porous Elasticity to a Neo-Hookean material, but maybe they just haven’t put all the error checking in that is required. For many illegal combinations, Engineering Data will use a strike-though font so highlight illegal combinations in material properties.<\/p><p>Note that you must mesh the bodies that will have permeability with the correct element type that supports coupled pore pressure analysis such as CPT217.<\/a><\/p><p>There are two Verification Test models of coupled pore-pressure deformations. One is a 2D model VM260.<\/a>  VM264 is a 3D model using CPT217<\/a>. I see they use Analysis Type of Static (ANTYPE,0) so maybe you don’t have to use ANTYPE,SOIL which was mentioned in 2.12 above.<\/p><p>In the last model you sent, I see the volume changes in Step 1, but not in Steps 2 and 3. Maybe when you get a model that includes pore-fluid diffusion, you will see a volume change.<\/p><p><\/p><\/p>\n","protected":false},"template":"","class_list":["post-403583","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t