Learning Forum

[Aavash Budhathoki]

Hello everyone,

I am trying to simulate the results of a tensile test using Ansys. My research advisor has provided me with the UTS, 0.2% yield strength, elastic modulus, and Poisson's ratio value for four specimens with different build combinations. I entered the values manually and created new materials in the materials library. Then, I proceeded to use Explicit Dynamics with the following parameters:

1. Mesh size - 0.001m

2. Fixed boundary condition, displacement - 0.03 m in 0.001 s

Despite having entered 27 MPa as the ultimate tensile strength value, the stress in the model exceeds that value without any signs of failure. I have been trying to replicate the experimental results for two weeks now but to no avail. I would be highly grateful if I could receive some assistance in this matter.

[Ram Gopisetti]

Hi, 

you have deficint material model,  UTS, 0.2% yield strength, elastic modulus, and Poisson's ratio are not sufficitent , you also need to model the plasticity definition, your material model should look like as follows (ideal, example)

you need to use an failure critieria from the engineerign data as follows 

then you need to make sure that the failure is used by mateial not of geomentric strain limit 

cheers, Ram 

[Desi Gustiani]

Can you explain to me about Displacement in the tensile test and where the numbers I should input come from?

[Sampat Kumar]

Hi Desi,
You can right click--> explict dynamics--> select the displacement--> enetr the value in the x, y or z component. I attacheed the screenshot here. 

as per your query, I got to know that you were asking how to enter the value. 
for more details about the displacement and force, please follow the attached link. 
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/wb_sim/ds_Displacements.html
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/wb_sim/ds_Force_Load.html
Regards,
Sampat

[Desi Gustiani]

Thank you Mr Sampat, how about the value should I put in X Y or Z component ? 

[Sampat Kumar]

It's the value of the displacement in the corresponding direction. If you want to enter the value in the x direction, then enter the value there. If you want to restrict the other direction, then you can enter 0 there. If you want to keep them free, then keep them free. It all depends on the boundary condition that you want to apply.

Regards,
Sampat

[Sampat Kumar]

go to the Ansys help documents for more information
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/wb_sim/ds_Displacements.html
Regards,
Sampat