Eigenfrequency issue of soft elastomer (PDMS)
Hi, Coming across this issue doing elastic wave band structure calculations. Starting with a simple square unit cell of a single isotropic material (no scatterers), with periodic boundary conditions....
View ArticleGlobal parameter in beam orientation
I defined a global parameter to change the section orientation in a beam model but when I try to compile the equations a get the following error message: Syntax error in low-level element syntax...
View ArticleDefinition of the First Piola-Kirchoff tensor
Dear Sirs, I am currently using Comsol 4.2a. I am performing numerical tests of structural problems both using the Structural Mechanics module and the General PDE module. I am modelling the material as...
View ArticleNeumann BCs for Structural Problems
Dear Sirs, I would like to have some informations regarding the Flux/Source BCs in Comsol 4.2. I have read that they correspond to the Neumann BCs. I am using two different modules (General PDE and...
View ArticleStrain Energies of a Shell from Eigenvalue solution
Hi everybody, I'm pretty new at this COMSOL thing, so I could use any advise you can give me on the following problem: I'm trying to calculate the ratio of strain energy stored in a thin film on the...
View ArticleDefine the Linearized Weak form for Comsol LiveLink Matlab
Dear all, I am facing the following problem: solving a structural nonlinear mechanics problem using Comsol Livelink Matlab. My idea is to have the Newton method inside Matlab and let Comsol compute the...
View ArticleHow do I do a plot of total plate stress against frequency?
I have a shell plate being driven by a point load and I already have surface stress plots that show stress at particular frequencies. What I'd like to do now is do a line graph showing total plate...
View ArticleContact problem in solid mechanic: sover don't convert
Hello! Thank you for the help. I tried all you said (changed the scaling factor, used the segregated solver, set a small initial contact pressure). But when I use the default settings with the...
View Articlestrain dependence of relative permittivity in semiconductors
Hi, I've used the structural mechanics module for quite some time to calculate the strain state of Germanium nanostructures on Silicon substrates. A new task now is to calculate the capacity of such a...
View Articlerigid connector
Dear colleagues, I need to constrain the center of rotation of a rigid connector with a spring. Is there the possibility to do that? It might be easy to do if I could use an existing point as the...
View ArticleMeshing problem
Dear colleagues, I'm modelling a thin walled element (solid geometry) and I want to mesh it with an hexahedral mesh with only one element along the thickness. I attached an image of the geometry. The...
View ArticlePML for Structural Piezo-electrical element
Does anyone have experience in setting up PML for structural piezoelectric element in COMSOL 4.0+ environment? Thanks. Richard
View ArticlePower, Power density, Current Calculation, Acceleartion level
Hy, I am working on electromagnetic micro-generation and this blog has previously been very helpful for me. Currently can anyone please let me know that after the voltage has been induced in Comsol...
View ArticleModal analyses of assembly constructions
Hi, I was making an eigenfrequency analyse of electric motor housing including several rotor and stator parts. Since I am using a solidworks livelink the construction is a bit more complicated yet...
View ArticleIncoherent rotation effect while testing thermal stress
Hi, I am running a model to test the thermal stress that appear at different zones of a solar thermal absorber made of prolypropylene. For this purpose i have sketched the axial section of this...
View ArticleThermal expansion in a core wire
Hello, We are trying to simulate the thermal expansion of a guide wire from the medical industry, when it is exposed to 4 different temperatures in 4 different ovens. We are using the solid mechanics...
View ArticleSqueeze Film Damping and Fluid Flow Deformation issues
I have been trying to simulate a micrometer scale (40 um x 16 um x 0.2 um) structure in laminar flow so I can calculate the forces and deformation due to movement towards and away from a surface....
View Articleloading then unloading simple elastic box - how do I implement it?
Hi all, I'm trying to implement a simple elastic box (as intermediate to a more complicated geometry) that in step 1 I compress by displacement of the left face and step 2 I remove the compression. Of...
View Articlestructural mechanics: rotation w/ rigid connector - unexpected behaviour
Hi all, attached you'll find a 2D model where I attempt to rotate a quarter circle around its centre. With a - rigid connector that rigidly connects it outer perimeter with the origin and centre - a...
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