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Spring in Abaqus

Submitted by mahmood seraji on
research

Dear all



When i assign the springs between pair points in two
plate over each other, the spring definitely acts in one direction only
(perpendicular to the plates), but they must be assigned in such a way
that the springs work in three orthogonal directions. it is important to
mention that the two plate is fastened using screws, where the spring
has been used for screw.

how can i overcome this problem?

 

Best Regards

Back Stress in Abaqus

Submitted by ron.dana on
research

Could you please advise if that is correct to select higher number of back stresses (as input) while simulating test results in Abaqus?

It appears to me that the higher number of back stresses (say selecting number of back stresseses in Abaqus >= 5) give me a better fit to the test results. For my case, 5 is an optimal value as increasing it will not affect the results, much.

Thank you.

Theory of dielectric elastomers

Submitted by Zhigang Suo on
research
suo group research
ES 241
Advanced Elasticity
dielectric elastomer
Spring 2011

In response to a stimulus, a soft material deforms, and the deformation provides a function. We call such a material a soft active material (SAM). This review focuses on one class of soft active materials: dielectric elastomers. Subject to a voltage, a membrane of a dielectric elastomer reduces thickness and expands area, possibly straining over 100%. The phenomenon is being developed as transducers for broad applications, including soft robots, adaptive optics, Braille displays, and electric generators.

State of hydrostatic stress along shear zone.

Submitted by priyadd84 on
research
Shear
Hydrostatic

Dear all,

          I did a three point bending test on a brittle rod. I observed an oblique fracture (slant approx 45 degrees). It can be an easy conclusion that this 45 deg crack is due to shear failure. But i have the following questions

1. Can a shear band  occur in  bending mode? as in literature very frequently shear bands are reported in pure tension and compression.

Cohesive elements parameters

Submitted by parisa on
research
cohesive zone model

Dear All,

I modelled a beam with a hole and used cohesive elements on the possible crack plane.

When I run the model in 2D, it works very well and I can get the results pretty good.

Why running the same model in 3D (making 3D model and running it) has caused me a headach for a long time and I can not

get the results?

Any idea highly appreciated,

Thanks,

Parisa

how to set the absolute contact stiffness when considering cohesive zone material (CZM)property

Submitted by Liming Jiang on
research
contact
ansys
stiffness
CZM

I'm simulating the interface between a steel plate and the fire proof coatings covering the steel plate. The elements i use in the simulation is contact 173 with a material property of debonding,which is defined as cohesive zone model.(CZM)

 CZM in ansys provides  TBDATA such as maximum contact stress,contact at the completion of debonding, but what's the problem is that I failed to set the initial contact stiffness. it's true that ansys provides FKN to define the contact stiffness, but it's just a stiffness factor.

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