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How to mesh a sphere using Matlab in Ansys?

I am working on shot peening using FEA. How to use matlab program in order to automatically mesh the sphere in Ansys?

 

Spring in Abaqus

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

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.

Zhigang Suo's picture

Theory of dielectric elastomers

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.

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

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

aaam's picture

I need this book (Theory Of Thermal Stresses by Prof. Bruno A. Boley)

Dear Colleagues,

 I need the PDF version of the following book can any one send me

Theory Of Thermal Stresses by Prof. Bruno A. Boley

Please kindly send it to my email address:

amirali1211982@yahoo.com

Liming Jiang's picture

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

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.

energy deviation in MDS

Any idea why energy deviation between successive steps become a large value during molecular dynamics simulation, when the number of steps is increased?

ANSYS Concrete Modelling

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Hi there

I am looking at the Drucker Prager Cap Model in ANSYS. I need to perform non-linear analysis for high strength concrete, but I am struggling with the constants input. If you have any good info please forward it to me.

Regards,

Tania

 

Cai Shengqiang's picture

Poroelasticity of a covalently crosslinked alginate hydrogel under compression

This paper studies the poroelastic behavior of an alginate hydrogel by a combination of theory and experiment. The gel—covalently crosslinked, submerged in water and fully swollen—is suddenly compressed between two parallel plates. The gap between the plates is held constant subsequently, and the force on the plate relaxes while water in the gel migrates. This experiment is analyzed by using the theory of linear poroelasticity.

phunguyen's picture

Crack penetration in cohesive zone models

Hi all,

I am conducting some cohesive crack simulations within the framework of XFEM. The cohesive model is an initially rigid traction-separation law for mode I.  In order to deal with negative values of the normal sepration/jump, I use a penalty stiffness K.

Yuhang Hu's picture

Indentation of polydimethylsiloxane submerged in organic solvents

This paper uses a method based on indentation to characterize a polydimethylsiloxane (PDMS) elastomer submerged in an organic solvent (decane, heptane, pentane, or cyclohexane).  An indenter is pressed into a disk of a swollen elastomer to a fixed depth, and the force on the indenter is recorded as a function of time.  By examining how the relaxation time scales with the radius of contact, one can differentiate the poroelastic behavior from the viscoelastic behavior.  By matching the relaxation curve measured experimentally to that derived from the theory of poroelasticity, one can identify

Slope of Contact force Vs time curve too steep.

Dear all,

           I did a 3 pt bending impact simulation with an elasto plastic model. But the slope of contact force vs time curve is too steep at the beginning of the impact. One trivial way of reducing the slope is by reducing the young's modulus of elements in the vicinity of contact or the impactor. Also reducing the mass of the impactor and the impact velocity did not help in reducing the slope.

Is there any other non-trivial parameters that controls the slope of contact force vs time plot? Thanks ina dvance.

 

 

rajnishmallick's picture

Non-linear buckling

 

I solved the mode shape of the clamped-pinned boundary conditions, a undefined parameter, 'c' is appearing in the mode shape of the coloumn.

Query:1)  Could anyone would like to discuss on this undefined parameter, 'c'. it is critical to define the final modeshape of the column.

 

Non-linear buckling.

How to find sum of all nodal forces in a plane in Abaqus.

Hello all,

            How to find sum of all nodal forces along a plane in abaqus. Thanks in advance.

Peng Liu's picture

About Multiscale

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I’m studing Multiscale Finite Element Methods recently。But I find it diffcult to read the book——Multiscale Finite Element
Methods Theory and Applications,which by Yalchin Efendiev,Thomas Y. Hou。Anyone have some program codes about Multiscale Finite Element Methods ?How to couple the corsa mesh and fine mesh?Thanks!

Amit Pandey's picture

Evoution of Yield surfaces: Past and Future Trend - Part 3

 My last two posts on this series

Part- 1 (node/9016) and

Part- 2 (node/9073)

were mainly focussed on the tension–torsion (σ11–√3σ12) stress space. This paper will be the final post on this series and will focus mainly on the behavior of  both of these alloys under tension–tension (σ11–σ22)space and conclude this ongoing research.

Abstract.

Brain drop simulation

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I am doing research involving the finite element modeling of a human head namely Scalp, Skull, Brain & Duramater using Abaqus/CAE. I have finished modeling the parts, assigning the material properties, assembling and meshing the said model. I need to drop the whole assembly onto a 'floor'. What step should I choose. Also what interaction would I have to create so that the head would shear when it is dropped a distance less than 1 cm. Also bear in mind that it should not bounce.

 Thank you.

Airplanes

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How do airplanes work? and Why are they safe?

please any comment about it 

Modeling contact in ABAqus

i am working on modeling hertzian contact (general and standard conact in abaqus). i want to know how to model contact between surfaces of my assembly.  i modeled it but it gives me error saying that my regions in the model are not connected.

How should I go about? is contact modeling different than just constraining the surfaces ? 

Reza khodaee's picture

Micro-plate's deflection

Hello

I'v been searching for micro-plate's deflection formulas.

Please help me in finding relations

Thanks 

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