If it is possible, what is the material's data? If not, why?

]]>I wanted to run a static structural simulation within the elastic limit of a polycarbonate based material- Makrolon. It is a highly non linear material, within the yield point. Please help in choosing the best material model to work with the same. The aim is to calculate the maximum load that can be applied below yield limit, which is 66 MPa (23 Deg C). All i have is stress strain data, which alone cannot be used in hyperplastic model (as I know). Is it possible to use multilinear model for the same? Thanks.

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.

I was trying to model cyclic plasticity using chaboche Kinematic hardening model. I noticed that when you input a chaboche Kinematic hardening model a curve fitting option becomes available. When you include the curve fitting option a uniaxial plastic strain test data input area where it says add experimental data becomes available. Can anyone please explain to me how I can input the uniaxial plastic strain test data and how I can get the chaboche parameters?

Thanks.

The circles on the geometry surface represent the electrodes and I drawn them by using FaceSplit and I don't know if this is the way to represent the electrodes and how the load is distributed when applying load to it. I also tried to do static simulation by applying pressure in both side of the elastomer and I notice that both pressures are not perpendicular to each other, and the pressure is not distributed evenly, any ideas how I can solve this?

I also added in the zip file a photo of the elastomer and it is fixed by a rigid frame from the top and bottom, in ANSYS I fixed all the four side of the elastomer. I really do not know how to start I have tried to look for any reference that can help but I cant find. I don not know how I can apply cyclic voltages under different frequencies on to my elastomer. By the way, I was using Sine wave to apply the load onto the elastomer during the experimental test .

What I want to achieve from the simulation is: finding the deformation of the elastomer under different voltages and frequencies. And I don't know if it is really possible to preform this kind of simulation with the student version. I am using ANSYS 2020 R2.

Any help will be highly appreciated🙏

]]>Hi everyone,

I am currently trying to model a single flexible robot arm. The arm deforms as pressure is being applied but even if more pressure is applied, the bending is the same. Below attach are my settings as well as my geometry as well as the end product I want to achieve.

P/S: I am using ANSYS Academic Student 2020 R2

I have been trying for a week and still couldnt get the result. I would be really grateful if you could help me out.

Thank you in advance

Sorry for the wrong end product. Below is the end result I want to achieve.

The circles on the geometry surface represent the electrodes and I drawn them by using FaceSplit and I don't know if this is the way to represent the electrodes and how the load is distributed when applying load to it. I also tried to do static simulation by applying pressure in both side of the elastomer and I notice that both pressures are not perpendicular to each other, and the pressure is not distributed evenly, any ideas how I can solve this?

I also added in the zip file a photo of the elastomer and it is fixed by a rigid frame from the top and bottom, in ANSYS I fixed all the four side of the elastomer. I really do not know how to start I have tried to look for any reference that can help but I cant find. I don not know how I can apply cyclic voltages under different frequencies on to my elastomer. By the way, I was using Sine wave to apply the load onto the elastomer during the experimental test .

What I want to achieve from the simulation is: finding the deformation of the elastomer under different voltages and frequencies. And I don't know if it is really possible to preform this kind of simulation with the student version. I am using ANSYS 2020 R2.

Any help will be highly appreciated🙏

]]>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

]]>I've tested 3 materials (on tensile strength machine, according to: ISO 6892) and then I put material data into ANSYS and wanted to receive similar results.

To check when the sample "breaks" in ANSYS I use this Eurocode 3 equation "50*(Re/Young Modulus)" and compare it with plastic strain in ANSYS.

For material 1.4310 results are very good, real sample broke at 19.5kN and I got plastic strain about 0.2 at 19.9kN - that's correlation above 97% (but weird thing is that simulation crashes few substeps after this threshold - I think it shouldn't but maybe it's some clue to further investigation).

But for materials 1.4301 and 1.4509 I got worse results.

1.4301 in real test broke at 13.6kN and in ANSYS it "breaks" at 10,5kN - correlation: 76%.

1.4509 in real test broke at 9,5kN and in ANSYS it "breaks" at 8,1kN - correlation: 85%.

I created special excel file, to convert elongation and force (output data) into true stress and plastic strain for all 3 steels, sample:

Then for future analysis I took only True stresses above Re and only to maximum value (no decreasing) and I got this curve (sorry for no values but I can't give you them)

My testing setup:

I'm using two surfaces, one fixed and one allowed movement in Y axis - where I apllied force - all just to simulate grips in tensile machine.

On the other side I have displacement - where I also check applied force.

Does anyone had this kind of problem before?

]]>I am trying to model railway ballast in ansys workbench but having convergence issues. So i want to use ansys workbench to model Drucker prager model.

it is possible to export the apdl model to workbench? If yes please guide me.

thank you,

kind regards,

naveen maddela

]]>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

Is there a way to define time varying quantities of thermal conductivity for a transient thermal?

I'm trying to solve a transient thermal problem, where in I knew the time variation of conductivities a priori. Basically, i was doing a multiple solve, and a each step i was using the MPDELE, and then try to redefine the material at a given time using MPDATA.

The solver triggered a warning that ' changing the material property during solution is a 'non-standard way'. Is it a correct way to define time varying quantities of a thermal- material property?

May i know if there any other standard way to define it.

Below is the script i tried to come up with

FINISH

/CLEAR,NOSTART

/PREP7

LENGTH=2e-03 ! 2*LENGTH, mm

HEIGHT=LENGTH/100 ! HEIGHT, mm

THICK=HEIGHT

esize=HEIGHT

area=HEIGHT*THICK

kxx_1 = 5.000000000E-03 ! VALUE AT initial time, t=0

cx_1 = 4.039360000E-02 ! VALUE AT initial time, t=0

t1= 358.000 ! inital temperature

mptemp,1,t1

mpdata,KXX,1,1,kxx_1

mpdata,C,1,1,cx_1

ET,1,LINK33

R,1,area ! AREA

k,1,-0.5*LENGTH

k,2, 0.0

k,3, 0.5*LENGTH

l,1,2

l,2,3

lglue,1,2

lesize,all,esize

type,1

real,1

mat,1

lmesh,all

esel,s,type,,1

nsle,r

IC,all,temp,1

allsel,all,all

d,node(-0.5*LENGTH,0,0),temp,0

d,node(0.5*LENGTH,0,0),temp,0

FINISH

/SOLU,

ANTYPE,TRANS

KBC,0

nleng=40

deltime=2

*dim,dxx_1,array,nleng,1

*dim,ccstinter_1,array,nleng,1

*do,tt,1,40

currtime=deltime*tt

curr_temp=(273+85)+2*deltime*(tt)

dxx_1(tt,1)=D0_1*exp((-ED_1)/(R*curr_temp))

ccstinter_1(tt,1)=RH*S0_1*P0_1*exp((ES_1-EVP_1)/(R*curr_temp))

mptemp,1,0

mpdele,kxx,1

mpdata,kxx,1,,dxx_1(tt,1)

mpdele,c,1

mpdata,c,1,,ccstinter_1(tt,1)

allsel,all,all

OUTRES,ALL,ALL

TIME,currtime

NSUBS,1,1,1

solve

*enddo

FINISH

]]>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.

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 :)

]]>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 need to simulate thermal behaviour of a coating (2 layers).

Coating modulus is only applied in the case of structural studies, how can i apply it in thermal case?

Thank you,

Best regards,

]]>I'm looking to modelise a specific composite materials ( it is composed by two materials in the microstrucure : 40Ti3AlC2 and 60Al, I joint an image (SEM) :

I dont know how to do that, I know to modelise only in layers

Thanks you

]]>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.....

]]>You cannot just combine BKIN with BISO directly.

Note: for the Chaboche nonlinear kinematic, if n=1 and gamma =0, it reduces to a bilinear representation.

Refer to Table 7.1 of MAPDL Material Reference Manual for a list of all allowable nonlinear material combinations.

]]>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 :)

]]>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

]]>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 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

]]>**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 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.

]]>