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

Submitted by mremami on
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
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

Definition of Reproducing Kernel

Submitted by Yeo Jingjie on
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Computational Mechanics Forum
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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
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torsion
torsion rod
torsion beam
torsion slit

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)

LUSAS/ANSYS modelling help

Submitted by reja e rabbi on
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Ask iMechanica

Hi,

I am working on delaminated composite materials. For analysis I was trying to use ansys or lusas but not able to model proerly . I need help to model the following problem.

32 layer laminated plate length 300mm

width 250mm

delaminated between 8th and 9th layer from the top and location is  100mm from left eadge and delaminated width 50mm. Simply supported in all four eadges.

lay ups are symmetric and assume any material property (E11, E12, E22, nu, G12 etc)

Problem : buckling load and mode shape to be determined.

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