×
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

Help on a abaqus model (excessive distortion)

Help on a abaqus model (excessive distortion)

Help on a abaqus model (excessive distortion)

(OP)
Hi,

I have finally gotten stuck on this model I am working on and was hoping someone here could give me some input on how to proceed.

The model represents a tear test occurring on a unaxial extension device (instron machine). The two materials are surgical mesh and the abdominal wall where the mesh prosthetic has healed over a course of a few weeks and has become embedded into the tissue. I have quite a bit of experimental data and wish to create a model that can, to an extent, replicate these results.
The individual models for each material uses the direct unaxial data from my experiments (marlow hyperelastic models) and works great. However when the two materials are put together with the corresponding constraints and boundary conditions the model seems to abort due to excessive distortion.

My model is summerized below:

Material 1: Mesh (soft knit polypropylene)
width=3 cm; height= 5 cm (3D Shell)
thickness= 0.1 cm
Hyperelastic material, Marlow (test data)
Density= 0.000946

Material 2: Abdominal wall Tissue
Width= 3 Gauge height= 4 cm (3D SOLID)
thickness= 0.75 cm
Hyperelastic material, Marlow (test data)
Density= 0.001034

Contraint:
Embedded
(mesh is embedded into 0.1 cm into the abdominal wall)

Boundary Conditions:
1) Displacement (Mesh top): U2= 3.0 cm (extension at max peak of force vs extension graph)
2) Encastre (abdominal wall bottom)

Step
time period= 0.75 (strain at max peak)
increment= 0.1
neogem on

Results are compared
by taking the sum of the reaction force from the fea model and comparingi to the total load of the experimental data

ive attached the fea model
if you have any input on what i may be doing wrong or what I could try so that this model would run
I would very much appreciate it

RE: Help on a abaqus model (excessive distortion)

(OP)
Never mind
I figured it out
Thankyou anyway

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