Surface Creation
Altair EmployeeHi all,
I am fairly new to Hypermesh (Optistruct) and have been practicing the software as part of final year in my degree. I am currently working on analyzing the maximum stress and its location on a UAV Horizontal tail. Now, I created the assembly in CATIA and exported (igs file) the file into Optistruct. Now, in order to analyse the structural integrity of the component, the force applied is essentially the lift acting on the top surface. As you can see, the problem I have is that I do not have a surface on my tail-only the internal structure has been modeled for this analysis, and in reality the skin of the tail is just a thin plastic sheet-hence the material of the skin could be neglected. So, I created the surfaces using spline/filler command and filled the gap between the ribs-for this simulation I have applied the forces on this created surface. However, the problem arises when, my simulation does not run, and it stated that I have not assigned any properties to the surfaces that I have created. Ideally, I would like to use that use that surface only to apply the forces onto and not create an actual skin-hence, distributing the load along the entire tail (ribs and main spar). Is there a way to carry this out, at the moment, the results I am achieving do not make much sense- as no stress is occurring on the internal structure itself.
One of the reason why I believe the stress does not have act on the internal structure could be due to the interaction between the mesh on the surface and the internal structure itself. I did notice that, when I created the surfaces using spline filler, it would not accurately follow the desired geometry-hence leaving a slight gap. Could this be a root cause for no stress on the internal structure?
Let me know what you guys think, any assistance and guidance will be appreciated. I have also attached a word document with some images of what I am trying to explain, hope they help.
Thanks and Regards,
Ramon