ive been trying to get the SN curve values for nitinol material for structural analysis for my final year project but i havent been able to get it till now

i have got the superelasticity and other properties but this i havent been able to due to whcih my research project for final yr has been on a hold for days

can someone pls help

]]>I am modeling a structure in ANSYS APDL. It includes several isotropic materials. I wrote my code and created the geometry in the X-Y plane, and Z-axis is perpendicular to my geometry. Now, I want to add a piezoelectric cylindrical disk to my model. The orientation of the cylinder axis is in the Y direction, and of course its polarization direction.

Now, if I start entering the material properties of the piezoelectric (Anisotropic Elastic) and Piezoelectric constants, by default. APDL will assume that the polarization direction is in the Z-axis due to the global coordinate system. However, in the real model is on the Y-axis. I would like to ask how to solve this problem? Should I start writing my code to change geometries orientation in such a way that the polarization direction of the piezoelectric (d33) will be in the Z axis. Or, there is a method to transfer the coordinate system of the piezoelectric material?

Here is the constitutive equation of the anisotropic piezoelectric:

Thank you in advance for any response,

Ali

]]>I'm trying to run a GFRP Orthotropic Elasticity with Ex and Ey (Young's Modulus) of 230MPa and 7500MPa, respectively, however, it seems that due to the steep difference between the two E's the software doesn't allow me to add the Poisson's ratio that I want. It keeps showing an interrogation mark and the analysis doesn't run.

I just would like to know what basis of the software to state that the properties of the material are off once it allows me to add all the values without direct relation.

Is there a limitation of the software or it has a function that relates to Ex,Gx and Poissons?

I really appreciate the help,

Thank you,

Andre Pitt

]]>I have used "multilinear isotropic hardening" as material nonlinearity for my steel structure. Now I want to add a material nonlinearity for my FRP composite structure....

I want to know whether material nonlinearity exists in FRP composite structures. If exists, which available material nonlinearity model in Ansys is suitable for FRP composite structures.

What are orthotopic stress and strain limits? why we need to include these properties in the structural analysis of FRP composite structures.

Finally, what is the significance of material nonlinearity in isotropic and composite materials?

Thanks in advance

regards

venugopalb

]]>I'm modelling a red blood cell and using a neo-Hookean material mode to describe the membrane. However, when I apply a stretching force to deform my model, it doesn't deform as much when compared to the experimental results. I'm thinking it might be a problem with the material I'm using. I'm using just the initial shear modulus and D1 parameter, is this all I need to create the material?

Any suggestion will be greatly appreciated, thank you

]]>In the shown images, separate links is done. How to link both simultaneously? I am unable to do it. If it is not possible please suggest alternate ways. I need both the material RVEs for my composite plate geometry.

]]>At the Moment i´m trying to build a material model for a polymer. I got tensile test data, and already figured the "true stress-strain-curve" out that i want to use.

In the two attached pictures you can see the curve. Necking started at about epsilon = 0,05 mm/mm.

Now I am really wondering how to correctly implement the data in the Ansys Engineering Data.

Right now my theory is to load the excel data until the necking point into the workbench with the uniaxial test data tool. Then i would try to get a good approximation via the hyperelastic curve-fitting tool. Afterwards i would define a yield point, and then describe the plasticity as a multinear or bilinear isotropic hardening.

(I already tried to do so but i wasn´t able to produce satisfying results...)

So my question, is this the right way, or should i change fundamental steps in my approximation?

And if this is the right way, which hyperelastic model would you recommend to describe a stress-strain curve like mine?

I´m thankful for every help,

Regards

I'm trying to simulate the deformation of the red blood cell using the neo-Hookean model. But it seems the initial shear modulus doesn't affect the rigidity of the cell. I'm using shear modulus from literature ranging from 7.5 to 22.5 micronewtons/metre. But the deformation is the same for each force applied to the cell, would anyone know what may be causing this?

]]>want to use this matrix

with thies values the first value is D11 second D22 and so on

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

]]>I am getting an error that the solution failed to solve completely at all time points, partial results at some at some points have been solved. I am trying to simulate Laser Transmission weld wherein I have used a Moving Heat Energy extension. I am using the 2020R2 student version of Ansys.

Kindly help me.

Thanks and Regards

Abhay Agarwal

]]>Are there any examples or tutorials on custom material models developed for Ansys mechanical?

For example to model the time-temperature transformation behavior to simulate the effect of heat treatment?

]]>I am using Ansys Explicit Dynamics. Is it recommended if we have a copper material colliding with a steel one that we use JC failure model for both? Or just for steel 4340?

Thank you very much.

]]>I am working on a project on the two materials of the SMA family. I am not able to find the material properties which I have to add to the engineering data. I need the following properties values for both the materials which are in the photo attached.

Can anyone help me with this?

]]>When I input data, the yellows marks occur. What does it mean? Thank you so much.

I have a uniaxial stress strain curve from lab test (vd. figure) with a yield strain of 12% and yield stress of 28 MPa.** Lab test result gives an elastic modulus of 990 MPa** while calculated one is E=28/0.12=233 MPa. Because I am intersted also in plastic behaviour, if I use 1090 MPa component will be stiffer and material does not yield and if I use 233 MPa material will deformate more than real application (probably, because is a bending like analisys).

Could Ansys manage non linear elastic behaviour like displayed one?

Thanks and excuse for my english.

I have a uniaxial tensile test results for my aluminium material. Is it possible for me to obtain "epfs" value for my analysis in ls-dyna?

I have found this formulation, but it looks a bit complex and I don't know how I can find the function Dp.

`epspl=integral over time of (depspl)=integral[sqrt(2/3(Dp)ij*(Dp)ij)]*dt`

I will be grateful if you can help me.

]]>Additive manufacturing is such a broad category, ranging from laser sintering to fdm printing which vary wildly in material properties depending on inputs such as infill ratio, print orientation, layer height and more.

Does anyone know what assumptions were made in the material properties within this section? or even better where this data was pulled from? All I can seem to find is that it is "sample data representative of XXX material" which is not very helpful!

Thanks in advance!

]]>I have recently installed the latest student version of Ansys student mechanical 2020 R2. I want to conduct a static structural simulation on the PLA material. But, despite being searching for a long time, I don't be able to find it out. Kindly, anyone helps me out in this regard.

Look forward to hearing back from you.

Thanks !

]]>I was wondering if anybody has used agilus 30,which is a additive manufacturing (poly jet) rubber like elastic material, in any simulations. How can I use this material in Ansys accurately? I was wondering If anybody could help me out with the material data, as I don't have the option to material test it and the data given by the proprietor isn't enough.

]]>]]>

Composition: Aluminium 10.7%, Magnesium 90%, Zinc 0.3%

]]>]]>

How accurate is the material properties in the ansys 19?

Because when I checked for FR4 the properties were different in different sites.

]]>I want to simulate SAR plots of a circular coil next to a hand. I am able to do so by importing a human hand from the ANSYS library. However, I want to have the hand be flat and parallel to the coil, and the ANSYS library hand is curved. Therefore, I am wondering how to take the "humanaverage" material, which is what the ANSYS human hand is made out of, and apply those properties to a simple block, then run the simulation from there. Is it possible to make other objects out of the "humanaverage" material? If not, is there a way I can replicate these properties into a new material I make on my own? I would be happy to do this but I do not know what those properties are, the ANSYS application does not give much detail about the properties of the humanaverage material.

Thank you.

]]>I am simulating the heating and melting of a hotmelt adhesive. However, I had to introduce the properties manually as I don't find any hotmelt adhesive in the fluent database. In addition, the results that I am obtaining after the simulation are not the correct ones so I think the problem has to do with the adhesive material.

I know that the adhesive that I want to simulate has a base of EVA (ethyl vinyl acetate). I saw in the Granta MDS database that there is a plastic-eva-shore material.

My question is for a chemist: would it be correct if I characterize the hotmelt adhesive as its base element (in this case EVA)? Would I be moving away from reality?

What do you recommend me?

Thank you in advance

]]>I have the creep curve from a tensile test. The data is used in the APDL-module to extract the constants for Modified Time Hardening using the curve fit functionality.

When I use the constants with the modified time hardening creep model the fit to the experimental data is quite good.

I then use the creep constants to define a modified time hardening material in Ansys where I run a simulation on a cube with friction less support on 3 sides and the same pressure used for the test data. This setup ensures uniaxial loading. The outcome should be the same as the input. It is not. I have tried to perform this simple test numerous times in different versions of Ansys but with the same result.

The entire setup made in Workbench 2019 R2 is attached.

If anyone has similar issues or even an explanation I will be grateful.

Martin

]]>I've been modelling a red blood cell and want to use neo-Hookean model to represent the cell material. I'm quite new to Ansys so a bit confused if I'm creating the material correctly. I'm using the initial shear modulus found in material literature, and the model is incompressible. Could you confirm if I'm creating the material correctly

Thank you for the help!

]]>I want to obtain tangent modulus from the results of my uniaxial tensile test. I find the picture below on the internet. However, as you can see, there are infinite number of points where you can calculate the slope. To obtain the tangent modulus of my material, which point's slope is required?

In brief, how can I calculate the etan (tangent modulus) value from my diagram?

I am using Workbench 17.0, and was wondering how I can make one of the bodies in explicit dynamics made of Kevlar woven fabric. I know about Material Designer, but I can't seem to find enough info online about how to make Kevlar specifically and then make a body in explicit dynamics such that it is made of Kevlar and behaves in the same way. Help would be greatly appreciated.

Thank you.

]]>I wanted to convert the Usermat to linear elastic material model hence I gave a very high yield stress value to skip the plasticity calculation. The model works fine with plastic strain value being zero and there's a linear relationship between stress and strain. However when I compare the results with the linear elastic material from workbench, there's a mismatch in the results and any changes made in Usermat reflects only on Stress values. Does ansys have a different way to calculate strain sent to Usermat and the strain value used in linear elastic model? Or are there any changes need to be done in Usermat to convert it to Linear elastic?

]]>