Skip to main content

Blog posts

Is negative strain energy density possible?

Submitted by JackyLuo on
strain energy density

I have a question that has troubled me for quite a while. Any kind of help would be greatly appreciated. I am computing the strain-energy density in a elastic solid when wave passes through. The formula I use is U=[I1^2+2(1+v)I2]/(2E), where U is the strain-energy density, I1 and I2 the first and second principal stress invariants, v poisson's ratio=0.3, E the Young's modulus. Since I1^2 must be positive, I2 might be negative behind the wave front. U might be negative. However, the textbook and many papers I ran into, says strain-energy density must be positive.

International Workshop on Mechanics of Wood & its Applications in Wind Energy Technogies, Dhulikhel, Nepal, 10-12 November 2008

Submitted by Leon Mishnaevsky on
conference

The International Workshop on Mechanics of Wood and its Applications in Wind Energy Technologies will take place 10-12 November 2008 in Dhulikhel, Nepal.

modelling

Submitted by Anonymous (not verified) on

Hi

i have to model a graphite/epoxy [0/+-45/90]2s composite laminate using ansys. can anyone please help me how to model it, as i m using ansys 4 the 1st time and dont know how to model a composite.

waiting 4 an early response

regards

Khan

wear of articulating surface of joint replacement

Submitted by Muhsin Salim on
research
fortran subroutine codes to solve wear equation

Hi everyone out there...

Now i'm working on biomechanics research project which deals with the articulating surface of joint replacement, where one of the main problem were the wear of sliding contact (i.e., metal on polymer,metal on metal or polymer on ceramics).wear debris or particles generated from this articulating surface can causes the damage of the bone cell around the joint replacement.My question are;

Two Questions in Concrete Modeling

Submitted by m_meisam on
education

Dear  Friends

I've 2 questions:

1) I use abaqus cae for concrete modeling and how can I attech a file (subroutine/etc.) to my model?

2) which category I should use for concrete while making a part(shell/solid)? while I'm trying to make a section , only shell section have a rebar layer and solid section dont have this option! what should I do?

Regards

Meisam M.

K&C Model for UMAT

Submitted by Zon Dol on
research

Hi everyone

I want to use Abaqus Implicit UMAT with K&C model to modelling concrete behavior .

As I know, when using Implicit, we have to update Jacobian stiffness matrix.

Is there anyone can help me? Please show me how to establidh and update stiffness matrix for K&C model.

Thank you very much,

Zon Dol 

meshfree softwares or packages

Submitted by babak on
research

Hello to everybody

I want to detect strain localization in geological materials and follow the path and the way that shear band propagate in seismic condition, so I want to know is there any meshfree commercial package to handle dynamic nonlinear analysis for geological materials specially rock and soil. Does exist Even a good source code that i improve it (not so much) and make it effecient for my purpose ?

I appreciate anyone help me and give me information in such field.

Truly

Babak

Subscribe to Drupal blog posts