research

I am modelling a very simple 2D contact problem between a rigid wedge indenter and a deformable squared-shape specimen (general steel material) in frictionless contact case. I used an implicit function f to describe the rigid indenter.



I implemented Lagrange multiplier method for this contact problem and the contact condition is: Inside the contact zone of the deformable specimen, the node set is active if f(node)<=0 and the Lagrange multiplier lambda<=0.

Dear Colleagues 

I want to start some research on the Carbon nano - tubes.

In the begining I need to model a CNT in the ABAQUS.

I wrote a code for generating the xyz Coordinates of the atoms in a CNT.

The problem is that I can not import them in abaqus.

Does anyone has an Idea ?



Thanks in advance

Hi

i am new new the the field of fracture mechanics i donot how to start it. can some one send some tutorial or other kind of help in doing fracture mechanics of nanocomposite using any software. Tutorials even of composites fracture mechanics using software so that i can have a idea about the fracture. 

thanks in advance

Hello everyone!

Tow Cross Sectional Area of fiber

Dear all,



I have a problem now:



I simulated indentation on a elastic-plastic model with a rigid
indenter, the elastic ideal plastic with von mises stress model in



ABAQUS is used. A contact pair is applied to calculate the contact between the indenter and the sample.



The problem is that the obtained the force-displacement data in the loading part, which contains the plastic deformation

is not smooth, but in the unloading part is smooth. But if a model