 ## General Mechanical

• mekafime
Subscriber

Hello,

I have this curve which I get as a result of analyzing in Ansys, my question is, until when should I stop analyzing, I am increasing the strength and the curve continues to grow, but how do I define the fracture, under what criteria to stop increasing the force acting on the model ?.

Thanks • peteroznewman
Subscriber

This is the force-displacement curve which says nothing about fracture.

I assume you have defined a material using plasticity.

The material has a property called elongation.

Fracture occurs when the Total Equivalent Strain > Elongation.

Plot Total Equivalent Strain vs Displacement.

Increase the force until the Total Equivalent Strain > Elongation then you will have reached fracture.

• mekafime
Subscriber
• mekafime
Subscriber
• peteroznewman
Subscriber

What is the Elongation material property for your material?

I wonder if the top graph has mislabeled axes?  Isn't the vertical axis showing deformation in mm and the horizontal axis showing equiv. total strain?

• mekafime
Subscriber

Hi Peter,

A500 Gr.B

YS: 315 MPa

US: 400 MPa

23% Elongation

The graph was update.

• peteroznewman
Subscriber

Since Elongation is 0.23 and Total Strain > 0.23, that means the simulation has gone past the point where fracture would have occurred.

• mekafime
Subscriber

Hello Peter

In my curve I still do not reach 0.23 I am at 0.0035, I increase the strength and I am very far. To obtain the curve I am taking an analysis point (node) from which I also take the deformation, is the approach correct or should I take the strain of the entire model? • peteroznewman
Subscriber
It's the maximum total strain in the model that is compared to elongation. 