MartinaC

Thank you very much Rahul for your complete answer Bestes Martina

Hi everyone, I asked for a new licence for educational version of Altair HyperWorks and I obtained it. I substitute it in the security directory of Altair but when I run HW the attached window appear. I also followed the operations indicated in the licensing mail. "Copy the file to a location that does not change (like a user directory) and set the environment variable ALTAIR_LICENSE_PATH to the location of the license file.To set an environment variable:In Windows 10, Go to Settings -> System -> About -> System Info -> Advanced System Settings.Click the Environment Variables button, and add a new User or System level environment variable with the New button. Add the variable name as ALTAIR_LICENSE_PATH, click Browse File…, browse to the location that the license is stored and select it." The same attached window appear. What can I do?

Hi everyone, I am simulating a tensile test of a homogeneous isotropic material, according to the coupon bar example in "Introduction of Non Linear Finite Element Analysis using Optistruct". I imported a different material and the coupon bar geometry is a bit different. I do not understand why the numerical force -displacement curve decreases after the yielding point, while, for example in the ebook, it follows the input trend. I though the possible problems could be the definition of the true stress-strain curve, or the NLQS parameters NINC and NLOUT, the chosen finite elements (tetrahedral; I used this type because I have to calibrate the material to perform analyses on more complex geometries). Can anyone find the problem? I attach the .fem file (ModelB_prova_NLQS). In additiion I attach a model that behaves as expected (Model2_surf_prova10_NLQS ModelB_prova_NLQS.fem MODEL2_surfs_prova10_NLQS.fem

Ok, thank you. There are differences in using the engineering or the true stress-strain curves, if correct defined according to the online guide? I mean, if I have analytically modeled the engineering stress-strain curve of the material, I can choose to import the whole curve (with TYPSTRN 0) or only the plastic phase correctly derived as explained in MATS1 description (with TYPSTRN 1), without any changes from the numerical results point of view. Is this correct? Bests Martina

I have to simulate a tensile test and to compare the resultant stress-strain curve with experimental results in terms of engineering stress and strains. I should import the true or engineering stress-strain curve as input data for the material? Bests Martina

Thank you Rahul!

I'm sorry. Is this the correct file? lines.hm

Hi Rahul, here the .fem file of the lines set. Thank you! Lines.fem

Hi everyone, I need to define a surface from a set of lines that represent level curves of a set of mountains. The creation of surfaces from lines does not work well. Is there a way to obtain good surfaces? Bests Martina

Thank you Rahul!

Hi everyone, is it possible to define as input data the behaviour curve of a non linear elasto-plastic matierial in a MAT1 card image material with the NL parameters activated? I tried to import the curve, changing the TYPSTRN value, but the solver Optistruct does not start. The curve has non linear trend both in the elastic that in the plastic phase. Bests Martina

There are other possibilities to simulate tensile tests of non homogeneous coupon bars and export the global stress-strain curve? Because I am able to export just the stress-strain curve of each element Best Martina

Hi everyone, I am simulating a tensile test with Optistruct. The analysis is NLQS and the material is isotropic. I set the analysis as proposed in the eBook "Introduction of Non linear finite element analysis using Optistruct", section 3.1.5 Tutorial: Small-Strain and Large-Strain Plasticity in a Test Coupon. I would like to understand how to set the CELAS1 element in order to use it for the building of the force-displacement output curve. I created the element, but the output curve results flat, so I think the problem is the Set. Attached is the .fem file, is usefull. Bests Martina MODEL2_surfs_JarvO1_NLQS.fem

Thank you very much Rahul.

Thank you. Yes, I have to perform SED analysis.