Learning Forum

[mekafime]

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]

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]

Hi Peter,

the curve : Eq Total Strain - Total deformation

[mekafime]

Hi Peter

The next curve : Equivalent Stress -  Equivalent Total Strain

[peteroznewman]

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]

Hi Peter,

A500 Gr.B 

YS: 315 MPa

US: 400 MPa

23% Elongation

 

The graph was update.

[peteroznewman]

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]

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]

It's the maximum total strain in the model that is compared to elongation.