×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# Simplest Test Simulation with Element Rupture

## Simplest Test Simulation with Element Rupture

(OP)
Hi,

I would like to run a calculation with element rupture. This will be Advanced Nonlinear static.

The easiest example I could imagine is a flat bar with reduced section in the middle. Looks like this below:

______ _______
| \/ |-->
|______/\_______|-->

This is a plate model fixed on one side and axially loaded on second side.

Define Material > General tab > Limit Stress > Tension & Compresion > 320
I have created Stress vs Strain Function (0,2 strain results in 320MPa and this is my ultimate stress). This is used in Define Material > Nonlinear > Plastic;
Yield Criterion 0..vonMises;
Init Yield Stress 235;

LGSTRN is checked
NXSTRAT Solver Parameters > Allow Element Rupture is checked.

Right now my simulation runs up to 0,565 time and then stops when max stress is 325MPa.

Questions:
1. Is my example simple enough? Myabe when it breaks it is very unstable and that is the problem?
2. Beside Allow Element Rupture check and Material Definition do I need to do anything more?
3. What I need to do to force element breake and the simulation to continue?
4. Can this be related to the size of load increment in the area of first element breake? Right now I have only 100 load steps equally divided.

Best regards,
Wnuc

### RE: Simplest Test Simulation with Element Rupture

to my knowledge, you cannot calculate up until the moment of breaking as, like you said so yourself, the model stability becomes an issue. The ratio elongation/stress will be far from realistic.

#### 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.

#### Resources

White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each personâ€™s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!