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UMAT
UMAT
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HomeSubroutine UMAT Subroutine (VUMAT Subroutine) introduction
Produced in Partnership Plan

UMAT Subroutine (VUMAT Subroutine) introduction

Rated 4.83 out of 5 based on 6 customer ratings
(7 customer reviews)

€ 190,00

This package is usable when material model is not available in ABAQUS software. If you follow this tutorial package, included standard and explicit solver, you will have ability to write, debug and verify your subroutine based on customized material to use this in complex structures. These lectures are introduction to write advanced UMAT and VUMAT subroutines in hyper elastic Martials, Composites and Metal and so on. Watch Demo

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Categories: Civil Engineering, Mechanical Enginerring, Subroutine Tags: ABAQUS, abaqus toturials, SUBROUTINE, UMAT, VUMAT
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Description

 

Introduction to UMAT Subroutine (VUMAT)

During the process of solving each problem, ABAQUS uses a specific program to relate the strain to the stress (the material model). So, If we can not use the material model in  ABAQUS/CAE,  the user should write the subroutine format known to ABAQUS as UMAT subroutine (in standard solver) or VUMAT subroutine (in explicit solver).

In fact, this subroutine is used to define complex or unusual and novel material models that are not available by default in ABAQUS.

Indeed, this tutorial package contains basic principles and concepts along with practical examples to get acquainted with this subroutine. In the other words, the ultimate goal of this tutorial is to give the user the ability to write UMAT subroutine and VUMAT subroutine to define the mechanical behavior of materials and introduce them to the ABAQUS software. See full information about what you are learning in the drop-down menu by clicking here.

You can find a demo of this package on our channel on YouTube.

Moreover, the general description of how to write a subroutine is available in the article titled “Start Writing a Subroutine in Abaqus: Basics and Recommendations “. You may also like this article to begin writing your own UMAT: Start Writing Your First UMAT in Abaqus

Workshop 1 for UMAT Subroutine

Firstly, in the first workshop, the behavior of the material is an isotropic linear elastic. Firstly, structural equations are fully explained. After that, the lecturer writes the UMAT subroutine and compares the results obtained from the subroutine with the results without the use of subroutine. See full information about this workshop and what you are learning in the drop-down menu by clicking here.

Workshop 2 for UMAT Subroutine

Subsequently, the elastic behavior of orthotropic materials is described in the second workshop. After that, the lecturer writes the UMAT subroutine for the elastic behavior of these materials along with the failure initiation of composite materials and verifies with the results obtained from the graphical environment of ABAQUS software. See full information about this workshop and what you are learning in the drop-down menu by clicking here.

Workshop 3 for VUMAT Subroutine

Thirdly, the elasticity behavior of isotropic material is simulated for brittle materials along with element removal in the third workshop. In other words, the difference between this workshop and the first workshop is using the VUMAT subroutine, considering the failure criterion, and setting the element removal. See full information about this workshop and what you are learning in the drop-down menu by clicking here.

Workshop 4 for VUMAT Subroutine

Finally, a complex example is examined. To clarify, In this simulation, computational plasticity equations are used. That is to say, the lecturer simulates the elastic behavior along with the plastic behavior of the material is also simulated. In conclusion, stress, internal energy, and dissipative energy are the output of the VUMAT subroutine based on isotropic hardening plasticity. See full information about this workshop and what you are learning in the drop-down menu by clicking here.

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

  • When do you need to use?
  • How to use UMAT and VUMAT Subroutines?
  • What is the Difference between material subroutines like USDFLD(VUSDFLD), UHARD(VUHARD), UHYPER, and UMAT(VUMAT)?
  • What is the difference between UMAT and VUMAT Subroutines?
  • How to convert UMAT to VUMAT and vice versa?
  • What are the Complete theories about hook’s law and implementation in the subroutine?
  • What is the flowchart of writing different UMAT and VUMAT subroutines?
  • How does ABAQUS solve the problem by these subroutines step by step?
  • What is the difference in the method of solution for ABAQUS/standard and ABAQUS/explicit?
  • Where different user subroutines (like CREEP, FRIC, UEL, UEXPAN, UGENS, USDFLD, UMAT, DLOAD, FILM, HETVAL, UWAVE and etc.) fit into Abaqus in solving the problem?
  • How to calculate the jacobian matrix in UMAT?
  • How to familiar with different types of equations, applications, and how they are derived for elastic material like isotropic, orthotropic, anisotropic in different types of elements like a shell, plane stress, plane strain, and continuum elements?

Workshop 1: Writing UMAT Subroutine for Isotropic Isothermal Elasticity

  • How to familiar with different variables in UMAT subroutine (DDSDDE, STRESS, STATEV, SSE, SPD, SCD and etc.) and how to calculate and differences between them (mandatory and alternative)?
  • what is the difference between time variables like DTIME, KINC and, etc.?
  • Which articles could help to write subroutines?
  • How to write the subroutine line by line?
  • How to add subroutines inputs and setting to use the subroutine in GUI of Abaqus?
  • How to Simulate the problem in beam model with Abaqus and subroutine and compare with each other to verify the written subroutine?

Workshop 2: Writing UMAT Subroutine for Elasticity and TSAI failure criterion of composite material

  • What is the stiffness matrix of orthotropic elasticity?
  • What is the TSAI-HILL failure criterion equation?
  • How to calculate other mechanical properties of orthotropic material by other inputs?
  • How to write the subroutine line by line?
  • How to Simulate the problem in shell plate model with the Abaqus material model and subroutine material model and compare with each other to verify the written subroutine?

Workshop 3: Writing VUMAT Subroutine for Brittle Materials + Element Removal

  • How to familiar with different variables in VUMAT subroutine (STRESSNEW,newSTATEV,SSE,SPD,SCD and etc.) and how to calculate and differences(mandatory and alternative)
  • How to find complete information about every variable in these two types of subroutines?
  • What is the difference between stress tensor in UMAT and VUMAT?
  • What is the setting to remove element in GUI and the subroutine in VUMAT subroutine?
  • How to write the subroutine line by line?
  • What is the setting to remove the elements in GUI and the subroutine in VUMAT subroutine?
  • Simulate the problem in solid with hole model with Abaqus material model and subroutine material model and compare with each other to verify the written subroutine.

Workshop 4 :Writing VUMAT Subroutine for Isotropic Hardening Plasticity

  • what is the equation of yield function, equivalent plastic strain, and other variables which have been used in the subroutine?
  • How to find the complete book or references to write the subroutine in computational plasticity filed?
  • what is the flowchart and equations which should have been used step by step in the subroutine?
  • what is the internal energy and how to calculate it?
  • What is the dissipated inelastic specific energy and how to calculate it
  • How to Write the subroutine line by line?
  • What is VUHARD subroutine?
  • What is the interface of VUHARD subroutine and how to write it?
  • How to Write the VUHARD subroutine step by step?
  • How to simulate the problem in the shell plate model with the Abaqus and subroutine and compare with each other to verify the written subroutine.
Additional information
Expert

Produced in Partnership Plan

Included

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

Tutorial video duration

160+ Minutes

language

English

Level

Advanced

Package Type

Training

Software version

ABAQUS 6.12

Reviews (7)

7 reviews for UMAT Subroutine (VUMAT Subroutine) introduction

  1. Rated 5 out of 5

    Mohamed Hassani – July 19, 2020

    I’m highly satisfied to deal with CAEassistant team in connection with service and support, a really expert group offer best training product on the internet from my experience in term of advanced simulation using subroutine and python scripting. if want to success you should follow a good teacher, for this reason, I encourage student and academic researcher to get touch with them.

    1 product
  2. Rated 5 out of 5

    William Anderson – July 21, 2020

    This package was able to give a good view of how to write subroutines in ABAQUS software. The advantage of this training package is complete explanations along with providing complete theories. I think the various and practical examples of this package help a lot to write my own subroutines.

    1 product
  3. Rated 5 out of 5

    Yasser Saleh – January 8, 2021

    Great package, it gives you a good idea about getting started with UMAT and VUMAT.

  4. Hanane Bushnell – February 12, 2021

    In my opinion, this package teaches all the necessary tips to start UMAT and VUMAT writing subroutine . However, it would be much more practical if more advanced examples were added.

    1 product
  5. Rated 5 out of 5

    Balaji Seenivasan – June 1, 2021

    This training was very much in line with what I expected. Thank you for giving complete information about writing subroutine to your customers. I also provided the advanced package and I am satisfied with both. Do you also have a consultancy service on writing subroutine for projects?

    • Experts of CAE Assistant Group – June 1, 2021

      Thanks.Yes. You can use consultancy service via this link:
      https://caeassistant.com/consultancy-application-from/

  6. Rated 4 out of 5

    Vidul Pise – June 3, 2021

    Thank you for your good training package. Is it possible to prepare a training package for writing subroutine in hyperelastic materials?

    • Experts of CAE Assistant Group – June 3, 2021

      It is possible. It depends on how many users request that.

  7. Rated 5 out of 5

    hmenginsoy – July 27, 2021

    It is a training that has been prepared by a very professional, reliable and expert team in its field and has the feature of creating a solid infrastructure for users. All the examples (they also send you all the application files) are presented in a very clear and explanatory way, by mentioning everything needed one by one (especially how the theoretical principles on different subjects should be applied, etc.). They dealt with everything in detail and quickly (before and after) the training process. Thank you so much.

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UMAT Teching Plan

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