×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Model from shape equation

Model from shape equation

Model from shape equation

(OP)
Hello everybody,

I am a bioengineer and I am interested in studying the problem of deformation of body tissues. I have never used ABAQUS so far but I have read about it and it seems exactly what I need to address certain problems that I am having. However, I wanted to make sure of a couple of things before acquiring it.

I have the mathematical expressions of the shapes of the objects I want to study. Say, I want to study the deformations of a solid object whose external surface is defined by the equation z=5-x^2-y^2 (0<z<5) (just an example) or a thin shell with the same shape, subjected to external forces. Would this be easily implemented and meshed in ABAQUS? I have been looking for it but all the help sections talk about simple shapes like cubes and cylinders.

Would the inclusion of an incompressible fluid inside the shell be implemented in the standar version of ABAQUS, or do I need specific fluid dynamics packages?

Thank you for your help.

RE: Model from shape equation

I didn't follow the equation but whatever else you've mentioned is doable in Abaqus (or any other modern FE package, really). You don't need any CFD functionality for this purpose. Which soft tissue is of interest to you, by the way? A disc? What are you trying to accomplish?

Are you new to this forum? If so, please read these FAQ:

http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083

RE: Model from shape equation

(OP)
I am trying to model the deformations of a cancer cell subject to external forces. Getting the relaxed, stress-free shape of the cell right is of great importance for the results. That is why I would like to map this shape equation that I have straight into an ABAQUS model.

I have an equation that determines the external shape of the cell in absence of forces, just the same way as x^2+y^2+z^2=1 is the shape of a sphere of unit radius, except much more complex. I'm sure there's some way of mapping it straight into a 3d model but I don't know exactly how.

Thanks for your help.

RE: Model from shape equation

(OP)
Thank you! I am happy to hear that it's possible. I was now looking *parameter keyword in the online ABAQUS help and I found this "analytical rigid surface" which seems exactly what I was looking for! http://abaqus.me.chalmers.se/v6.12/books/usb/defau...

RE: Model from shape equation

(OP)
Oh yes I want it deformable (hyperelastic). But what I meant is that the keyword *SURFACE seems to do the job, doesn't it? Then instead of asigning the surface to a rigid body I would assign it to a deformable shell

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources