Implementation of Lemaitre Damage model with VUMAT subroutine
In this training package, as it is clear in its syllabus, the concept of damage is first explained using the literature reviews. This model is now widely used to deal with coupled damage analyses for various mechanical applications. The Lemaitre model is the damage model that occurs simultaneously with plasticization. And then, Coupled yield equation with the damage equation is presented. Abaqus Lemaitre damage training package is available for solid mechanics students on the CAEassistant shop. Â
In this package, Firstly, we try to introduce the Lemaitre damage model, including damage mechanics and formulation of the model. Then, writing the Lemaitre subroutine is reached step by step. To do this job, the flowchart of the subroutine, Writing the subroutine line by line, implementation of the subroutine in one element and verification is done. In the last chapter, we implement this subroutine in a complex problem and an upsetting process.
It should be noted that in this damage model, the operator split method is used to solve the equations, and after these equations are solved, the elastic and plastic deformation and their laws are introduced one by one. And it will be explained how to use it in subroutine writing with the help of this theory.
In the next part, the VUMAT subroutine flowchart and its needed inputs and outputs are presented. It should be noted that there are a series of state variables in this subroutine, which can be used to check the outputs given by the subroutine, which include the equivalent plastic strain, the damage parameter, and also the element deletion by another state variable is examined.
Notice: if you are not completely familiar with writing VUMAT subroutines, you should get the VUMAT introduction training package, or if you need more professional information, get the advanced UMAT & VUAMT package version from the website. It should be noted that in this training package, it is necessary to use the Lemaitre VUMAT subroutine due to the hardening topic; you should use VUHARD, too; the VUHARD package is also available in the training packages.
The “Implementation of Lemaitre Damage model with VUMAT subroutine” package is used for shell elements. The equation is based on Finite element simulation of the punchless piercing process with Lemaitre damage model article. If you want to get more information about the Lemaitre damage modeling package, please watch the Demo video.Â
What is the Lemaitre damage model?
This model is a model whose hardening is isotropic and rate-dependent. Also, the yield is based on the von Mises criterion, which is combined with the Lemaitre damage model.
Is the Lemaitre damage model very different from the ductile damage models? And what is the difference between them?
Yes, this model is different from the normal damage model that exists in ABAQUS and other software. In the Lemaitre damage model, yielding and plasticization occur simultaneously with damage, but in the normal models that exist, the damaged area and the plasticity area are two separate areas.
Read more: Abaqus Ductile Damage
mike –
It was grate. I appreciate both your contribution to this package and the efforts of your coworkers to prepare it. I have some questions about the VUMAT subroutine that I think I should learn more about it. What package can I get to learn more about this subroutine’s parameters and how they are used in it, and how it works?
thanks for your help
brian –
I wanted to make changes in the Lemaitre model and use this model for my project you could tell me how I can get your help for my project?
scott –
Is there an article related to the Lemaitre model available on your site so that I can have information about this model very clearly and clearly about its equations and how to obtain them?
novik –
It was great. I thank you for the educational package and the efforts of your colleagues to prepare this educational package. For the discussion of writing subroutines, I have a series of questions that I think I should get to know more about the VUMAT subroutine itself. What package can I get so that I can learn more examples about this subroutine and the types of parameters that are used inside it and how it works?
vili.salvak –
Hi, I have a damaged model that does not cover any of the damaged models on your site. How can I propose this subroutine to your team?
Benjamin.zesa –
I highly recommend this package for solid mechanics students. The use of the operator split method to solve the equations and the introduction of elastic and plastic deformation laws make this package a valuable resource for those interested in damage mechanics.
Noémie-zar –
It’s worth noting that this training package assumes some familiarity with writing VUMAT subroutines, so it may not be suitable for beginners. However, the package provides a valuable resource for those looking to improve their damage analysis skills using Abaqus
Zuri –
I recently used the Lemaître Damage Model implementation package with the VUMAT subroutine, and I must say the results were outstanding. The quality of the simulations was very high, and we were able to perform analyses with a level of accuracy that we previously struggled to achieve. The documentation and guides provided were clear and comprehensive, making the implementation process smooth and straightforward. I am very satisfied with this package.
Nia –
The Lemaître Damage Model implementation package we recently purchased has truly transformed our simulations. We were able to achieve much more precise simulations using this package, effectively resolving issues we previously encountered in damage modeling. One of the features I particularly liked was how user-friendly the VUMAT subroutine was. It allowed us to reach desired results much faster. My question is whether there are additional documentation or guides available for more complex issues and specific applications?
Amara –
Using the Lemaître Damage Model package was overall a very positive experience. This package perfectly met our needs, and we achieved highly accurate results. The documentation and guides provided were very helpful and made the process of implementing models straightforward. A notable strength of this package was its ability to handle various types of damage, significantly improving the accuracy of our simulations.
Kofi –
The Lemaître Damage Model implementation package is truly impressive. We were able to conduct more accurate damage analyses and improve the overall performance of our simulations. One of the standout features was the simplicity and user-friendliness of the VUMAT subroutine, which made implementing complex models quite easy. The accompanying documentation was also thorough and helpful.
Sade –
The Lemaître Damage Model package we recently acquired effectively met our needs. We were able to perform precise simulations and the results were very satisfactory. One of the positive aspects of this package was the detailed and clear documentation that made using the VUMAT subroutine straightforward. My question is whether there is technical support available for questions and issues after purchasing the package?
Kwame –
Your package covered all our needs for damage simulations and allowed us to achieve more accurate analyses. Working with the VUMAT subroutine was very straightforward, and the documentation provided was well-written. This package helped us achieve much better results.
Dakarai –
The Lemaître Damage Model package was a significant help in addressing our damage simulation issues. The results we obtained were very accurate and reliable. One of the notable features was the comprehensive and clear documentation that made the use of the package very simple.
Jelani –
The Lemaître Damage Model implementation package effectively met our needs, and we achieved more accurate results. Using this package was straightforward and quick, and the accompanying documentation was well-written. A strong point of this package was its ability to handle various types of damage. My question is whether there is an option to request specific features for our projects?
Kofi –
The Lemaître Damage Model package we purchased greatly helped us improve our damage simulations and resolve issues with damage modeling. The documentation and guides provided were very useful and made using the VUMAT subroutine easy.
Temba –
Your package performed excellently in our projects, and we were able to achieve desirable results. Overall, using this package was a positive experience, and our simulations showed significant improvement. One of the benefits was the accuracy and reliability of the results provided. My question is whether there are regular updates for this package, and how can we stay informed about these updates?