| iMechanica

I am trying to model a sheet of Poly Vinyl Butryl (PVB), which is a viscoelastic material in ANSYS. I have all the regular properties like elastic, shear and bulk modulus, poisson ratio, denstiy and damping factor. I also have a stress- strain curve of PVB. With all this data, is it possible for me to find the various constants in the viscoelastic models using ANSYS?

Thanks

Saurabh

How to define Pre-Strain (or Pre-Tension) in ABAQUS?

Submitted by mremami on Thu, 08/12/2010 - 15:48

education

Hi,

I want to medel an overhead line conductor in Abaqus. As you know, the suspended cable has a parapolic (or catenary) profile under its weight. There is a pre-tension (or pre-strain in elastic region) on the cable due to its weight.

I found in the help of Abaqus that I can use the "Bolt load" option to define the pre-tension, but it does not work for my model. Because my model doesn't have surface to choose for this type of load (it's a 2D wire part).

Would you please let me know how can I define this pre-tension (or pre-strain) in my model?

What is axis of pure rotation?

Submitted by sreenath on Thu, 08/12/2010 - 11:06

education

rigid body kinematics

The concept of axis of of pure rotation ( or instantatious center of rotation) is a bit confusing. The text books in engineering mechanics( Irvin shames , Beer & Johnston etc) tells that the locus of points in a body, which is (are) having zero veloity. This fits well in case of a 2D motion. As a limiting case of this we are assuming the center of rotation is at inifinity for a rigid body moving in a straight line

need help,abaqus Umat/Vmat for functionally garded material

Submitted by amir sabety on Wed, 08/11/2010 - 21:47

research

iam looking for abaqus Umat/Vmat for functionally garded material, is there any one who can help me with sample or code?

amirbsn [at] gmail.com

thank very much

FEM developer job opportunity

Submitted by deform1 on Wed, 08/11/2010 - 15:13

materials science

evolution of microstructure

large deformation

job

FEM

Computational Materials Modeling

computational material model

Increase of steel shear modulus under pressure/compression

Submitted by tzirakian on Wed, 08/11/2010 - 07:11

I would like to know the amount of increase of steel shear modulus under pressure or compression. Any ideas, references, ... I'd appreciate your support in advance. Thanks.

Definition of Reproducing Kernel

Submitted by Yeo Jingjie on Wed, 08/11/2010 - 02:32

Forums

Computational Mechanics Forum

Free Tags

meshless

reproducing kernel

Hi all, I am currently beginning research as a graduate student on meshfree methods, focusing on RKPM right now. I have not been able to find an exact definition of what exactly a reproducing kernel means. Could someone kindly define a reproducing kernel? According to W.K Liu et al, a good example of a reproducing kernel is a Fourier transform, but I can't grasp why is that so.

Torsion of annular rod with longitudinal slit

Submitted by bfinio on Tue, 08/10/2010 - 18:18

Forums

Ask iMechanica

Choose a channel featured in the header of iMechanica

Free Tags

I have a question regarding simple torsion of a circular shaft with a uniform cross section. Given a hollow circular shaft with inner radius R1 and outer radius R2, length L, shear modulus G, fixed-free boundary conditions and applied torque T about the central axis, the equation for the rotation angle at the end of the beam is

phi = T*L/(J*G)

where J = pi/4*(R2^4-R1^4)