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

Submitted by Liming Jiang on Fri, 10/22/2010 - 13:38

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

Submitted by tkrish on Fri, 10/22/2010 - 09:07

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molecular dynamics

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

Submitted by taniamoreira on Thu, 10/21/2010 - 15:25

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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

Poroelasticity of a covalently crosslinked alginate hydrogel under compression

Submitted by Cai Shengqiang on Thu, 10/21/2010 - 15:00

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.

Crack penetration in cohesive zone models

Submitted by phunguyen on Thu, 10/21/2010 - 13:43

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.

Indentation of polydimethylsiloxane submerged in organic solvents

Submitted by Yuhang Hu on Thu, 10/21/2010 - 11:38

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, o

Slope of Contact force Vs time curve too steep.

Submitted by priyadd84 on Thu, 10/21/2010 - 04:36

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ABAQUS

contact

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.

Non-linear buckling

Submitted by rajnishmallick on Wed, 10/20/2010 - 19:00

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nonlinear 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.

Submitted by priyadd84 on Wed, 10/20/2010 - 09:33

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ABAQUS

Forces

Hello all,

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

About Multiscale

Submitted by Peng Liu on Wed, 10/20/2010 - 09:23

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About Multiscale

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！

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