Blog posts
Need help/advise constructing positive-definite Wendland Compact-Support RBF Matrix
Hello,
I am trying to construct a matrix using Wendland's Compact-Support RBF as described in the following the paper, http://www.cs.umbc.edu/~rheingan/pubs/smi2001.pdf . In particular, I'm using the C2, d = 3 RBF: (1 - r)^4*(4r + 1). It seems quite simple enough, but none of the matrices I've constructed are positive definite, although Wendland's RBFs guarantee positive definite matrices -- the sparse solver I intend to use requires positive definite matrices.
Help regarding 2D co-rotational beam formulation
I have implemented a 2D co-rotational truss formulation in matlab. I get identical results to OpenSEES.
Now I'm trying to implement a 2D co-rotational beam formulation. I have followed the simple formulation in Crisfield's book volume 1. It seems like this should be a fairly straight forward extension of the truss formulation. I have rederived everything Crisfield has done and obtained the same results, yet something is still incorrect.
Free Energy
For a system in thermal contact with the rest of the world, we have described three quantities: entropy, energy, and temperature. We have also described the idea of a constraint internal to the system, and associated this constraint to an internal variable.
Strain gradient plasticity: the flow rule of Fleck and Hutchinson violates thermodynamics ?
A recent paper on JMPS has seriously questioned the foundation of the SGP theory of Fleck and Hutchinson. The matter is not simple, but is it a good bench test for imechanica to discuss?
how to start learning FEM from the begining
hello , iam nitin . well , iam very curious to learn FEM and that also from the begining. Is there any book with simple notations and easy to understand for a first time learner at undergradute level.?
Are you looking for KEO Carbon Pedals
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Call for Abstracts - Symposium on Advanced Computational Methods for Fracture (IMECE 2009)
This is topic 12-21 Advanced Computational Methods for Fracture in the upcoming ASME Congress 2009 (November 13-19, Lake Buena Vista, FL., USA.) Deadline for abstract submissio: March 2, 2009.