I am simulating the machining of Ti6Al4V on ABAQUS using dynamic explicit procedure. I have taken the data for johnson cook damage from research papers but none of them mentioned displacement at failure. I am not getting the chips as expected because the displacement at failure is wrong. How to calculate this?
Define damage initiation and damage evaluation criteria and later on, in the visualization module, find out the relevant displacement at damage from the contours, and frames.
I also encountered the same problem in a simulation, and I was able to solve my issue using this website. I hope it proves helpful for you as well.
https://caeassistant.com/product/johnson-holmquist-damage-model-in-abaqus/
Computing the displacement at failure which serves as input for the damage evolution is definitely something that it is not trivial and it depends on, as always, on some assumptions that you make.
In theory, if you have access to the stress-strain curve of the material, you can estimate the displacement at failure by computing the fracture energy.
Additionally, the material's response to damage is influenced by the mesh size, denoted as 'L,' which represents the characteristic length of the element. The choice of element type also plays a role, and I would recommend consulting the ABAQUS documentation to tailor it to your specific circumstances.
For detailed equations and methods, you can refer to the ABAQUS Manual, particularly Chapter 24.2.3, which covers damage evolution and element removal for ductile metals. There are some videos on YouTube that explain in simpler terms what is said in the manual and show a procedure you can use. Below you can find them:
[1] Tutorial: How to calculate fracture energy for damage evolution for damage for ductile metals?
https://www.youtube.com/watch?v=lshQFoQsDuE
[2] ABAQUS Tutorial: How to define the characteristic length for a finite element ? and its application
https://www.youtube.com/watch?v=VK1qtjMYRo0
Hope that helps with your question!
References:
Damage evolution and element removal for ductile metals - ABAQUS Manual http://130.149.89.49:2080/v6.13/book/usb/default.htm?startat=pt05ch24s02abm43.html
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