Hi,
I have a question about my project. In my project, I'm going to give some heat to my sample in ansys workbench and this heat will cause some thermal expansion. I have fixed my sample mechanically and I want to see the crack propagation and fracture caused by thermal expansion. for this purpose, I have solved it in steady-state thermal and connected my solution to static structural, but in this way, I can not find the fracture and crack propagation in my sample. Is there any way to find the crack propagation or failure of material in this project?
Bests,
Erfan Fatehi
Hello Mr Fatehi,
your setup sounds good. Did you include the "Fracture" Keyword into your Solution already? This tutorial might be exactly what you're looking for:
https://www.youtube.com/watch?v=2FQl9A92n6Y
Regards
Gino
Gino Mathlouthi
Thank you for your response. The problem is that I do not know where exactly a crack is going to propagate. I am interested in crack propagation . for example I want to give some force to my sample and see if it will cause crack in my sample or not and where is the crack located. I don't know if I can do it just like what it was shown in the video.
Again, thank you.
Bests,
Erfan Fatehi
Erfan Fatehi
Glad to help you out! Crack propagation requires you to know or assume the position of your initial crack. The case which you are describing now is a bit different and much easier to handle.
While damage can occur in the elastic deformation during alternating loads over long periods of time I don't think this applies here.
Most damage occurs during plastic deformation. As a gross oversimplification you could say that any plastic deformation is a potential crack.
To make sure that there are no potential cracks in your model, you could use a safety factor of for example 2. So if the von Mieses Stress exceeds half of the allowed stress (yield stress/ safety factor), you have identified a critical region.
You could use a smaller safety factor, depending on how much you trust your material model, your mesh and your simplification of the geometry.
After identifying regions you could use the tutorial I sent you to see how your part could fail at these locations.
Regards
Gino
Erfan Fatehi,
If you don't know where crack is going to be generated or don't want to specify the initial crack in your model, then XFEM is your best bet. ANSYS is not very good in performing XFEM analysis and only got an XFEM ACT which is not that easy to work with. I recommend using Abaqus for this analysis. You can find a good tutorial form the following link.
http://www.matthewpais.com/abaqus
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