Dear All,
I am new to simulations of carbon nanotubes, especially in their mechanical properties. My supposed tools are ab initio codes or md codes. I am looking for some references. Can someone introduce some classical papers or leading experts in this field.
Thanks.
I am using Abaqus to calculate the critical loading for a 3D buckling beam with both ends pinned. However, the resutls are extreamly large and do not make sense. I try to calculate the 2D case and it matches with theoretical solutions very well. So I doubt that the eigenvalues in a 3D case has some meaning other than the critical loading.
For a 2D beam buckling problem, the eigenvalues are the critical loading. What do the eigenvalues for a 3D buckling beam mean? Thank you!
Hi all,
I am currently working on Virtual crack closure technique. I met some problems with the local crack-front coordinate system. I wonder if i can find a detailed explanation on the coding of the local crack-front coordinate sytem.
Thanks a lot
Joachim Guilie
During the study of FEM, I found the term "weak form" of differential equation, which is the integral form of a differential equation along with the boundary conditions for a boundary value problem. Now my question is that why the term "weak" has been used.
Dear all,
I am writing a program for crystal plasticity using VUMAT. I met some problems, hope you guys can help me out.
Assume each node represents a single crystal. At each step, VUMAT will give strain increment which is based on curent configuration(right?)
Then I can calculate the shear strain in each slip system and obtain the plastic deformation gradient. So I can get the elastic deformation gradient for current step. Using polar decomposition, rigid body rotation matrix can be obtained.
This article will appear in Journal of ASTM International. I hope you find it useful.
Xiao-Yan Gong, President, medical implant mechanics LLC
Advances in Computational Tire Mechanics Minisymposium at ECCM IV, Paris 201016-21 May 2010, http://www.eccm2010.org/
Hi all!!!
I have a very basic question in Fracture Mechanics. The question is as following.
"Stree Intensity Factor (SIF) is more in plane stress problems (plasic zone size is big) than in plane strain problems (plasic zone size is small). How do we explain this, without refering or invoking energy conecpt?"
I request to give some thoughtful explanation.
With regards,
- Ramdas
