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Lemaitre damage
HomeFracture/Failure Lemaitre Damage model implementation with VUMAT Abaqus
Produced in Partnership Plan

Lemaitre Damage model implementation with VUMAT Abaqus

Rated 5.00 out of 5 based on 2 customer ratings
(2 customer reviews)

€ 250

The Lemaitre damage model is now widely used to deal with coupled damage analyses for
various mechanical applications.

In this package, Firstly, we try to introduce the Lemaitre damage model, including damage mechanics and formulation of the Lemaitre damage 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, the upsetting process.

 

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Description

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.  

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. 

Preview

  • What do we learn from this package?
  • Teaching plan and Prerequisites and Next steps
  • Package specification

You can watch demo here.

Watch Video

Introduction to Lemaitre damage model

  • What is damage mechanics ?
  • What is the formulation of Lemaitre damage model?

Writing the Lemaitre subroutine

  • Flowchart of the subroutine
  • Writing the subroutine step by step
  • Implementation of the subroutine in one element
  • Verification

Workshop: Implementation of Lemaitre damage model in upsetting Process

  • Problem description
  • Simulation step-by-step
  • Discussion about the results

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.

Additional information
Expert

Produced in Partnership Plan

Included

.cae, .for, .inp, .jnl, .odb, .pdf

Tutorial video duration

140 Minutes

language

English

Level

Advanced

Package Type

Training

Software version

Applicable to all versions

Subtitle

English

Reviews (2)

2 reviews for Lemaitre Damage model implementation with VUMAT Abaqus

  1. Rated 5 out of 5

    mike – November 17, 2022

    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

  2. Rated 5 out of 5

    brian – January 19, 2023

    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?

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SKU: AC8104 Categories: Civil Engineering, Dynamic Analysis, Forming, Fracture/Failure, Subroutine Tags: ABAQUS, abaqus toturial collections, Damage, Lemaitre, plasticity, SUBROUTINE, VUMAT

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Rated 5.00 out of 5
€ 320
This tutorial teaches how to simulate damage in 3d continuum composite materials in ABAQUS. As you know, Abaqus does not have any material model for 3d composite materials. So, the user needs to write a customized subroutine to simulate damage initiation and progressive damage for composite materials in ABAQUS. In this package, one of the most practical damage initiation criteria (Hashin) is used to detect failure. It should be mentioned that this subroutine includes gradual progressive damage based on the energy method. This complex subroutine could be used for static and dynamic problems.
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