I am tryind to modell a corrugated shell (steel) as an orthotropic shell with same thickness. I have found the eqiuvalent Youngs Module Ex Ey Ez etc to achieve an equivalent flexural stiffness and Ex',Ey',Ez to achieve an equivalent extensional stiffness for the orthotropic shell. But in Ansys I can only put one Ex and one Ey etc to modell the orthotropic elasticity.That means that I cannot model the shell with the same flexural and extensional stiffness as the corrugated shell at the same time. To achieve this I was thinking that a way would be to apply the stiffness matrix by yourself. I found in Internet that for Abaqus is possible. Can I do this in Ansys, because I am working with Ansys right now? Any help would be appreciated :)

]]>My question is if the increase of incomprehensibility parameter d1 of hyperelastic materials will result in less resistance to deformation of the material.

Thank you.

]]>I have managed to build a cubic RVE in Material Designer, where I have extracted a complete Mechanical moduli; E, G ,Nu.

Now, I would like to build another a model validation using workbench but honestly, having no idea what periodic boundary conditions that been imposed by the Material Designer. I have come across such an article (attached) where they have done similar validation but they have managed to impose [Displacement and loads]. However, I am planning to do impose only Displacements in order to calculate for the engineering moduli.

Any help would be much more appreciated. Many thanks. Layth

Below is a sample command sequence that shows how to set up the logarithmic scale for creep coefficients C1 and C5.

TBDELE,creep,matid

TB,creep,1,2,7,11

! Interpolate creep property C1 in LOG-LINEAR SCALE

TBIN,SCAL,Temp,1,LOG,LINE

! Interpolate creep property C5 in LOG-LINEAR SCALE

TBIN,SCAL,Temp,5,LOG,LINE

!

TBTEMP,1400

TBFIELD,Temp,400

TBDATA,1,1e-15,0,0,0,1e-40

TBDATA,7,0

!

TBFIELD,Temp,500

TBDATA,1,5.0e-13,3.6,-0.45,0,4.2e-37,14.8

TBDATA,7,0

]]>I want to modell a corrugated steel pipe in Ansys as a simple cylinder with orthotropic properties. I started modelling a simple plate and I found Ex, Ey and Gxy, exy, with formulas from literature and I put these values in ansys to than compare the thin plate (with orthotropic properties) and the corrugated plate. My problem is that to modell a cylinder I need other values such as Ez, shear modulus Gyz Gxz and Poison´s ratio eyz ,exz. I know that it has not so much to do with Ansys but I dont know how to find this from Literature and to apply it in Ansys. Or Should I try different values to see which is more relevant to approach the solution of a corrugated cylinder. If anyone has had the same issue or has knowledge in this direction I would be happy of every advice! Many thanks in advance!

]]>I am modeling non linear concrete and want to use **drucker prager model**. I am very confused how to get these values. Please help me. Compressive strength of concrete is 3940 psi. Thanks in advance.

Thanks,

Regards,

ADEEL

]]>I have glued the three volumes ie substrate, layer1,layer2 as shown in figure. Then, i am trying to kill the layer2 to simulate the deposition of layer1. At last, i will activate the layer2 and apply the load on the layer2.

Am i thinking in the right direction?

There are 43 loadsteps in each layer so i am using do loop but, i am getting following error,

Where do i place 'ekill' command in my code??

i am attaching the snapshot of the APDL script after meshing.

My final goal is to simulate the static behavior of an embedded beam with 2 lawyers, one piezoelectric (PZT-5H) and the other no piezoelectric (copper) when I put voltage.

I tried to enter a piezoelectric material in ANSYS with piezoelectric And Mems extension.

For that, I add a new material in technical data and I write its anisotropic elasticity:

Then, I did geometry with two boxes:

In model, I assign one material to each lawyer (box):

For boundary conditions I put:

- fixed support
- piezoelectric body (with parameters of PZT-5H)

- voltage

I want to observe directional displacement along z axis because I had to have this result:

Finally, I have no displacement along z axis with the simulation. And it's not normal.

Am I the right approach to enter a piezoelectric material and to put voltage?

And where do you think the problem is?

Thank you for your answers :)

]]>I was Trying to model a frame assemblage under Cyclic Loading. I have a material parameters for the **Chaboche** Kinematic Hardening model and the parameters for the nonlinear isotropic hardening **Exponential law. **My Question is since Ansys Only Has the **Voce** and **Power law** nonlinear isotropic hardening model can I use the **Voce law** with the linear coefficient equal to zero (since the the Voce law and the exponential law formulas only differ by the linear coefficient in the Voce law)? What I am basically asking is if Ansys will have a numerical problem while solving if I make the linear coefficient zero? I only have the parameters I specified above I can't curve fit anything.

Exponential Law = σY=σ0+R∞(1-e-bε¯pl)

Voce Law = σY=σ0+R0*ε¯pl+R∞(1-e-bε¯pl)

Any help or Suggestion will be very helpful.

Thanks

]]>**CONCRETE COMMANDS**:

ET,MATID,SOLID65

R,MATID,0,0,0,0,0,0

RMORE,0,0,0,0,0

MP,EX,MATID,29250

MP,PRXY,MATID,0.2

MPTEMP,MATID,0

TB,CONCR,MATID,1,9

TBTEMP,22

TBDATA,1,0.3,0.8,1.5,25

TB,MISO,MATID,1,35,0

TBTEMP,22

TBPT,,0.0001,2.925

TBPT,,0.0002,5.7

TBPT,,0.0003,8.325

TBPT,,0.0004,10.8

TBPT,,0.0005,13.125

TBPT,,0.0006,15.3

TBPT,,0.0007,17.325

TBPT,,0.0008,19.2

TBPT,,0.0009,20.925

TBPT,,0.001,22.5

TBPT,,0.0011,23.925

TBPT,,0.0012,25.2

TBPT,,0.0013,26.325

TBPT,,0.0014,27.3

TBPT,,0.0015,28.125

TBPT,,0.0016,28.8

TBPT,,0.0017,29.325

TBPT,,0.0018,29.7

TBPT,,0.0019,29.925

TBPT,,0.002,30

TBPT,,0.0021,30

TBPT,,0.0022,30

TBPT,,0.0023,30

TBPT,,0.0024,30

TBPT,,0.0025,30

TBPT,,0.0026,30

TBPT,,0.0027,30

TBPT,,0.0028,30

TBPT,,0.0029,30

TBPT,,0.003,30

TBPT,,0.0031,30

TBPT,,0.0032,30

TBPT,,0.0033,30

TBPT,,0.0034,30

TBPT,,0.0035,30

**REBAR COMMANDS:**

ET,MATID,LINK180

MPDATA,EX,MATID,,2e5

MPDATA,PRXY,MATID,,0.3

TB,BISO,MATID,1,2

TBDATA,,460,2100

R,MATID,12,,0

**PRE PROCESSOR COMMANDS:**

/PREP7

ESEL,S,ENAME,,65

ESEL,A,ENAME,,180

ALLSEL,BELOW,ELEM

CEINTF,0.001,

ALLSEL,ALL

/SOLU

OUTRES,ALL,ALL

**POST PROCESSOR COMMANDS:**

/SHOW,png

/ANG,1,

/VIEW,1,0,0,0

/DEVICE,VECTOR,ON

SET,Last !Outputs final result set

PLCRACK,0,0 !0,0 all cracks, 0,1 first crack, 0,2 second crack, etc.

Thanks

Regards,

ADEEL_khan

]]>I need help .

Thank You

]]>I have used classic Drucker-Prager material model in my 2D uniaxial powder compaction problem.

I have defined both linear elastic and inelastic (non-metal plasticity>drucker-prager) behaviors, but the simulation terminates due to a large number of warnings regarding the YIELD FUNCTION in Extended Drucker-Prager (EDP) model. See the warning message:

EDP plasticity: Yield Function Not Defined for element 909 and material 2.

I cannot find any option in Material Models Window to define yield function. There is not also EDP model there. Is it accessible only by scripts?

Where I have done wrong?

Any help is appreciated.

Thanks,

Amir

]]>I have just recently correlated a material model, and am considering to distribute the model (basically just parameters setup of the constitutive laws) to other parties/partners. I'd like to encrypt the material data. As I have very limited experiences with Ansys, I have to ask helps of how to encrypt the material data. The encrypted material setup, also called the material cards called in other softwares such as LS-Dyna and PamCrash, should not affect the normal usage, and the user just only need to reference the material, rather than knowing what actual data inside.

Thank you for your helps!

Regards

ywan459

]]>Hi everyone, i'm using ansys workbench to make a 3D model of a glulam beam. I want to make a plastic analisys but i don't know how to set the plasticity criterion of the wood. I made an orthotropic material with stress and strain limts. How to create an ortho. plasticity criterion? (When i use stress and strain limits is the analisys elastic?)

Thanks

I want to use Silicone rubber in ansys workbench but I am not sure that its properties in ansys library is correct. Do you have any recommendation?

Thanks

]]>I am simulating the deformation of a collapsible tube which is made of silicon and I am trying to define its material using different models such as Neo-Hookean and Arruda models. I was wondering

1-how I can fin the documentation of ANSYS on these two models?

2- How can I calculate the module of elasticity, E, out of these two models?

]]>I

s there are tutorial or procedure for the ANSYS workbench 21 software? I ask because I found manual for 17/18 software's.

]]>I am modeling a concrete-filled steel tube. I have represented two components only: steel tube and concrete core.

1. In order to represent the behavior of steel, I am using the multilinear isotropic hardening plasticity. The relationship stress x strain was formulated by Tao (2014).

2. In order to represent the behavior of confined concrete, it was modeled the linear behavior with a modulus of elasticity and Poisson ratio.

3. The concrete nonlinearity also was modeled through the relationship stress x strain by Tao (2014) using multilinear kinematic hardening plasticity (This was the only procedure that I found for input a relationship stress x strain with descending stage).

4. The failure stress of concrete was modeled through Drucker Prager concrete, in order to represent the softening behavior through the Fracture Energy HSD Model. I would like to represent exponential softening behavior. However, the answer in the softening stage is linear, instead of exponential behavior that I have imputed. What could be my error?

5. The solution failed even before the plateau stage after the softening stage. What could I improve in order to achieve this stage?

6. I am using four load steps to process the model. First load step to dead load, second load step to the linear stage, third load step to transition from hardening to softening behavior, and finally, the last load step for the softening behavior. This was because I would like to have more points in the curve in the transition stage from hardening to softening behavior. Besides that, I think that I need minimal increments of load in this stage to help the convergence. Also, I am using automatic time-stepping, in order to positively affect the convergence. However, the program has chosen the number of substeps. Is this combination of NSUBST and AUTOTS is appropriate? Is there another way more interesting?

7. Is recommended to add the reinforcement steel bars in the concrete core to improve the model? If yes, what is the better approach for my model?

8. The material properties that I have cited are available in this link: https://www.researchgate.net/publication/264121579_Refined_finite_element_modelling_of_concrete-filled_steel_stub_columns

9. I am not sure if members of Ansys Learning will be able to access attachments, if necessary, I could share my code in this principal box here.

I wonder if any member could help to respond and resolve these questions.

Thanks in advance.

Regards.

]]>I am trying to define a Polymer material based on tensile test data. my main issue is the polymer enters the plastic zone after 70% strain.

I am using this polymer in an application that works only in the elastic zone of the material (entering the plastic zone for my application means failure).

I used Yeoh 3rd order (hyperelastic model) to define only the elastic part of the curve ( less than 70% strain) and my simulation ( using static analysis in ansys work bench) works well, is this right? if not I would appreciate it if you suggest the right method for defining the material.

I checked the forum and I understood that Hyperelastic materials should not be used with plastic materials.

I uploaded the tensile test figure for the polymer.

But none for cylindrical Structures. I would like to know if it is possible to create a new polar coordinate system in the material library to define the chracteristics or if there is another idea.

Thanks for your support.

]]>I am trying to simulate a steel ball on top of a rubber materials (hydrogel/gel) simulation on APDL and I have a couple of questions, or perhaps someone could guide me on what to do.

What I am trying to simulate deformation of rubber materials in which the steel ball is put on top of a hydrogel/gel that is made up of elastomers (PDMS, PDMS/PEG, Natural Rubber, etc). The idea is that as time goes by the steel ball will deform the hydrogel and the hydrogel experiences creep. I've done preliminary runs and I set up a Mooney-Rivlin model for the rubber materials and I set the steel ball to be elastic linear isotropic.

In my first run, I applied structural displacements and then I did load steps opts and write LS files (The result of my displacement is shown in the picture. However, I think it is important to add the weights of my objects. My first question is, how do you add the weights of your objects? Secondly, Do I need to?

How do I simulate creep? What do you guys think? Any tutorials/books do you recommend?

]]>I am trying to use the plastic strain failure model for a material with the below stress-strain curve.

I use the relation introduced in this thread (https://studentcommunity.ansys.com/thread/multilinear-kinematic-plasticity-material-model-create-from-a-stress-strain-graph/) to obtain true stress-true strain curve and "plastic strain". But the problem is that large value of strain in this polymeric material leads to a negative value for plastic strain. The below table:

I wonder how I can enter this data for my material model in a multilinear hardening? And if I use Plastic Strain Failure criteria for failure, what value I should set for maximum EPS?

(I have attached the excel datasheet to this thread).

Hamed

]]>

Also in thmmodel I am using carbon fibre rods (which support the film) at the top and left edge

My question: How do ensure the anisotropic material properties are correctly orientated in the models parts?** **

I need the MD to be in say the X direction of the thin film membrane. For the carbon rods I need the anisotropic properties in the correct directions. I'd be grateful for any advice or guidance, thanks.

]]>I have attached a photo of my work for your reference. please I need your help As soon as possible

Thanks In Advance

]]>Dear all,

I have used so many concrete material models like TB,concr,matid to TB,concr,matid,DP etc and from the old legacy element to new technology unfortunately non of these responds as needed. the closest response is from the last model i.e. TB,concr,matid with MISO points.

Can someone please advise me if I am making the right approach of testing all these materails models and elements?

The material models are enlised below. Some of them I have taken from ansys help sys examples and some from Mr. Mirghani posts in the student commnunity:

ET,MATID,CPT215 Coupled nodes with Rebars in all directions

E=20000, v=0.2 Fuc=31.6 Fbc=36.34 Fut=3 Rt=1 D=4e4 Scv=-35 R=2 Yt0=0 Yc0=2e-5 Bt=3000 Bc=2000 c=1600 m=2.5

MP,ex,1,E

MP,NUXY,1,v

TB,MPLA,1,,,DPC

TBDATA,1,Fuc,Fbc,Fut,Rt,D,SCV

TBDATA,7,R,Yt0,Yc0,Bt,Bc

TB,MPLA,1,,,NLOCAL

TBDATA,1,c,m

ET,MATID,185 ! Define elements as SOLID185

MP,EX,MATID,29100 ! Define Elasticity Modulus

MP,NUXY,MATID,0.2 ! Define Poisson's ratio

TB,MPLANE,MATID,,6 ! Define the microplane model parameters

tbdata,1,0.75,0.75,0.208,6.109e-05,0.512,98 !k0,k1,k2,α_mic, β_mic, beta_mic

TBTEMP,22

ET,MATID,185

Drucker Prager Concrete Model with Dilitancy Parameters

! ELASTIC CONSTANTS

MP,EX,MATID,20.0E9

MP,NUXY,MATID,0.2

! Base Drucker-Prager concrete

Rc=30.0E6 ! uniaxial compressive strength

Rt=3.0E6 ! uniaxial tensile strength

Rb=36.0E6 ! biaxial compressive strength

delta_t=0.25 ! dilatancy factor tension

delta_c=1.0 ! dilatancy factor compression

! Linear hardening/softening

kappa_cm=0.0025-Rc/20.0E9

kappa_cr=0.0025

omega_ci=0.33

omega_cr=0.1

kappa_tr=0.0005

omega_tr=0.2

TB,CONCR,matid,,,DP

TBDATA,matid,Rc,Rt,Rb

TB,CONCR,matid,,,DILA

TBDATA,matid,delta_t,delta_c

TB,CONCR,matid,,,HSD6

TBDATA,matid,kappa_cm,kappa_cr,omega_ci,omega_cr,kappa_tr,omega_tr

continued.....

]]>I have a large, transient, fluid flow simulation with hundreds of time-steps (.dat files), in which the basic fluid flow field is solved.

I want to add in the species transport model in this simulation. The geometry has multiple inlets, the goal is to "color" fluid coming from one of the inlets. I do this by creating a material which is exactly the same as the bulk material, and having it come out of the selected inlet. This allows me to determine the amount of fluid coming from that inlet in any cell.

Because the two materials are identical, the species transport will have no effect on the flow field.

Is there a way to use the flow field, which is already calculated, to quickly calculate the concentration of this identical species throughout the geometry?

Proposition of a different method is also welcome.

]]>

I am trying to simulate in ANSYS fluent 2020 R1, and I need to use formic acid from the ANSYS fluent database, but it seems to me that this material does not have the right values (density 1 kg/m3 and viscosity 1.72e-5). I have uploaded the picture.

I also noticed that these values are reported for a large group of materials as well!!

So given that my simulation is a two phase flow of formic acid and CO2 and there is not heat exchange involved, can I simply change the values in the box in fluent database and continue or I should write a new entry (and if so, please let me know how I should do it?)

Thanks in advance

]]>

I am using ANSYS Additive 2019 for my thesis research, it is pretty cool that we can customize the material properties like yield strength and elastic modulus, but in the ANSYS user's manual, I could not find information related to temperature dependency for conductivity and specific heat. I wonder how the thermal analysis goes for the changing temperature dependent material properties. Does anyone know? Thanks.

Here I attached an example of what I am looking for in another FE analysis tools.

]]>A typical polynomial equation looks like shown below:

*Cp=-111.901539044454*(T^5) + 160732.871948007*(T^4) - 92348942.2355927*(T^3) + 26529419205.7051*(T^2) - 3810589467578.09*(T) + 21893499260717.*

But when I add these equations into ANSYS Fluent through the material properties as a piecewise polynomial Fluent rounds off the coefficients and this introduces an error in the specific heat that it calculates. I also tried using a UDF to do the same and based on the results I think even in that case Fluent rounds off the coefficients.

For obtaining the correct specific heat values I need Fluent to not round off the coefficients, is there a way to do this?

Or is there something else that I can try?

]]>I've been trying to do fatigue analysis for a new new material but it shows an error that "An error occurred inside the FATIGUE module: Invalid or missing stress life curve." Any possible way to resolve this error will be really appreciated.

Thankyou in advance..!

]]>Please let me know if you have any suggestions on this.

]]>