Thank you for the practical video on this advanced topic at such a low price. It was interesting to see how we could validate the publication results from scratch in Abaqus using different techniques.
Hi. There is no difference between the usage of Ductile Damage model in the topic you mentioned and what is explained in this tutorial. I mean the premium version of it. Every thing is the same and only the appearance has changed. In the topic you mentioned, there is also another damage mechanism which is the delamination between the particles and matrix. To account for the failure mode, Cohesive Surface can be defined. We have also a comprehensive tutorial for this failure mode: ruclips.net/video/O6FM2MgUgQs/видео.html Also we have a tutorial for the damage analysis of RVE based on the combination of XFEM and CZM. Here is the link to its preview: ruclips.net/video/NgDmFZluYBs/видео.html To purchase each of them, you can send email to us: mirzabozorg71@gmail.com
Hello, first of all thank you for your videos. I have a question,I want to specify a strain threshold for the material, and after this threshold the element should be deleted. It looks simple, but I could not manage to solve this problem. Is there any keyword that can be added to the input file in order to specify this threshold ?
Hi. You are welcome. It can be done from property module but it depends on the mechanical behavior before damage happening. For example, if you are modeling a metal, damage happens after the plastic behavior. In this case you must use damage models like ductile damage, shear damage and Johnson-Cook. But if you are modeling a brittle material, damage happens after elastic region and you must define brittle cracking model.
Thank you very much for your answer. In my case I am working on a brittle orthotropic material, the problem is that brittle cracking doesn't work with orthotropic material. So I don't know if can I use a shear damage with very small plastic region ? And I checked the unsupported keywords in Abaqus, I couldn't find any keyword for cases like those. If you know a keyword for this case, please share it. Thank you very much.
@@mouhamadabouhamdan6563 You are welcome. If you want to use shear damage or ductile damage models, yes you must define plasticity and you can define a small plastic region but I have not used them for orthotropic materials and I don't know whether they work for you or you will encounter error. You must try and see what happens. The other way which I know is to use USDFLD or VUSDFLD subroutines to define failure criteria and do element removal. But is is not as simple as doing settings in property module.
@@FemexIran Thanks, really you are so helpful. For the shear damage, it works with orthotropic material but you should add hill potential with ratios of stress=1 in plastic region to reproduce the mises plasticity. Again, thank you.
Hello Sir, I have a small dought related to "step time". What will happen if I increased and decrease the "Step Time" value. I have kept it as "1" by default.
Hi. For the quasi static analysis, you must not decrease it too much because it will increases the kinetic energy and the simulation will not be quasi static any more. Also you can use any arbitrary value which is large enough only when the material is rate independent. If it is rate dependent, you must exactly use the time period used in the test.
Hi. You are welcome. Actually the deleted elements are removed graphically. I have not seen any command or option in the visualization module to show the deleted elements. If you don't request status in the field output settings, the fully damaged elements will not be removed. in these elements the SDEG parameter is equal to 1 in every integration point.
Such a useful content for modeling damage!
Hi.
Thank you so much.
Thank you for the practical video on this advanced topic at such a low price. It was interesting to see how we could validate the publication results from scratch in Abaqus using different techniques.
you are welcome.
could you please make a video on deformation and fracture mechanism of particle reinforced metal matrix composite with ductile damage model
Hi.
There is no difference between the usage of Ductile Damage model in the topic you mentioned and what is explained in this tutorial. I mean the premium version of it. Every thing is the same and only the appearance has changed. In the topic you mentioned, there is also another damage mechanism which is the delamination between the particles and matrix. To account for the failure mode, Cohesive Surface can be defined. We have also a comprehensive tutorial for this failure mode:
ruclips.net/video/O6FM2MgUgQs/видео.html
Also we have a tutorial for the damage analysis of RVE based on the combination of XFEM and CZM. Here is the link to its preview: ruclips.net/video/NgDmFZluYBs/видео.html
To purchase each of them, you can send email to us: mirzabozorg71@gmail.com
@@FemexIran Thank you, could you please upload complete video of RVE based....tutorial.
@@Ravi-ld5br Unfortunately at present we don't have any tutorials for what you asked for.
Hello, first of all thank you for your videos. I have a question,I want to specify a strain threshold for the material, and after this threshold the element should be deleted. It looks simple, but I could not manage to solve this problem. Is there any keyword that can be added to the input file in order to specify this threshold ?
Hi.
You are welcome.
It can be done from property module but it depends on the mechanical behavior before damage happening.
For example, if you are modeling a metal, damage happens after the plastic behavior. In this case you must use damage models like ductile damage, shear damage and Johnson-Cook.
But if you are modeling a brittle material, damage happens after elastic region and you must define brittle cracking model.
Thank you very much for your answer. In my case I am working on a brittle orthotropic material, the problem is that brittle cracking doesn't work with orthotropic material. So I don't know if can I use a shear damage with very small plastic region ? And I checked the unsupported keywords in Abaqus, I couldn't find any keyword for cases like those. If you know a keyword for this case, please share it.
Thank you very much.
@@mouhamadabouhamdan6563 You are welcome. If you want to use shear damage or ductile damage models, yes you must define plasticity and you can define a small plastic region but I have not used them for orthotropic materials and I don't know whether they work for you or you will encounter error. You must try and see what happens.
The other way which I know is to use USDFLD or VUSDFLD subroutines to define failure criteria and do element removal.
But is is not as simple as doing settings in property module.
@@FemexIran Thanks, really you are so helpful.
For the shear damage, it works with orthotropic material but you should add hill potential with ratios of stress=1 in plastic region to reproduce the mises plasticity.
Again, thank you.
@@mouhamadabouhamdan6563 You are welcome. Thank you.
Hello Sir, I have a small dought related to "step time".
What will happen if I increased and decrease the "Step Time" value. I have kept it as "1" by default.
Hi.
For the quasi static analysis, you must not decrease it too much because it will increases the kinetic energy and the simulation will not be quasi static any more.
Also you can use any arbitrary value which is large enough only when the material is rate independent. If it is rate dependent, you must exactly use the time period used in the test.
@@FemexIran Thanks for clarifying my dought sir.
@@abhinavsiliveru5448 You are welcome.
thank you for sharing, I have one question,how to choose all deleted element in easy way ?
Hi.
You are welcome.
Actually the deleted elements are removed graphically.
I have not seen any command or option in the visualization module to show the deleted elements.
If you don't request status in the field output settings, the fully damaged elements will not be removed. in these elements the SDEG parameter is equal to 1 in every integration point.