New article: Clarification of a point on rotations with small strain measures.
http://www.parresianz.com/fem/rigid-body-rotation-small-strain/
-- Biswajit
Hello,
I am developing a solver implemeting Polygonal Finite Element Method (PolyFEM). Currently my code can handle n-gons with nmax=6 (hexgon).
I am trying to test the code with comlex geometries for which I need to obtain polygonal meshes. PolyMesher developed by Dr Paulino's group can obtain polygonal mesh using voronoi doagrams but the code doesn't provide control over the maximum number of edges of a polygon in mesh and ends up creating octagons etc. Hence I am thinking of using a code which can convert a structured T3 mesh into hexagonal mesh.
Is anybody aware of an open source software which can help me achieve this? Alternatively, is there a way of creating strictly hexagonal mesh using voronoi diagrams?
Thank you.
-Mithil
For simplicity in understanding Perioidic BC in ABAQUS, I am trying to implement in a single element elastic model.
Material is elastic. There are two reference points defined Refpoint 1 for x-direction pull and Refpoint 2 for y-direction pull. Please find the attached picture for clarity in the model.
I have defined the equations for PBC in ABAQUS as below:
x1-x2+Refpoint1=0
y1-y2+Refpoint1=0
x3-x4+Refpoint1=0
y3-y4+Refpoint1=0
x2-x3+Refpoint2=0
y2-y3+Refpoint2=0
x4-x1+Refpoint2=0
y4-y1+Refpoint2=0
I get the following error:
2 nodes are missing degree of freedoms. The MPC/Equation/kinematic coupling constraints can not be formed. The nodes have been identified in node set ErrNodeMissingDofConstrDef.
This happens because of defining constraint for the same node repeatedly. But in my case I have not done still I get error.
In this model for defining the perioidic boundary conditions, can anyone please help in writing the 8 equations ?
| Attachment | Size |
|---|---|
 Single element elastic model with 2 ref points modelled in ABAQUS | 7.48 KB |
Dear Friends,
I have developed a ser of 2-D finite elements for the problems of structural mechanics. These two dimensional elements are capable of accurately predicting three dimensional stress states using three diemnsional constitutive law. My doubt is: can these elements be used for the analysis of 3-D crack propagation using XFEM?. The displacements chosen for these elements are simple.
Subramanian