Fracture energy value for shear damage

[Vxxxxx]

Hi, I am conducting a 2d cutting simulation of a certain material, and I calculated the fracture energy from the shear stress-strain curve according to this formula provided by abaqus documentation.

(

https://abaqus-docs.mit.edu/2017/English/SIMACAEMATRefMap/simamat-c-damageevolductile.htm)

And so, by taking the area under graph from strain (0,pl) to strain (f,pl)(coloured in red), then mutiply by the characteristic length of the element, I should get the correct value.

My values are 49.6 (N/mm^2) x 0.001 (mm) = 0.0496 (N/mm)
My elements are very small (0.001mm).

However, this 0.0496 (N/mm) fracture energy is too small that the elements got deleted right away after contact and the cutting force is way too low compared to experimental results.

I wonder if I left out something and any suggestions/advice would be greatly appreciated.

Thank you very much.

 

[FEA way]

You may have to adjust the material properties a bit or increase mesh size. That’s a common approach when trying to achieve the desired results of analyses with material damage.

 

[Vxxxxx]

Hi FEA way,

noted, I will try to adjust the value of fracture energy. thank you very much.