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USDFLD AND VUSDFLD SUBROUTINES in ABAQUS
USDFLD AND VUSDFLD SUBROUTINES in ABAQUS
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HomeCohesive Introduction to USDFLD and VUSDFLD Subroutine
Produced in Partnership Plan

Introduction to USDFLD and VUSDFLD Subroutine

Rated 4.80 out of 5 based on 5 customer ratings
(5 customer reviews)

€ 170

In this usable tutorial, the material properties can change to an arbitrary dependent variable. One of the most important advantages of this subroutine is simplicity and applicability. Various and high usage examples are unique characteristics of the training package.

This training package includes 5 workshops that help you to fully learn how to use USDFLD and VUSDFLD subroutines in Abaqus software. By means of these subroutines, you will have expertise redefine field variables at a material point by the solution dependence of standard and explicit, respectively.

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Description

Introduction to USDFLD and VUSDFLD Subroutine

Using Abaqus USDFLD and VSDFLD enables you to simulate models in which the properties of their materials are related to some parameters or conditions. For example, modeling an adhesive joint whose cohesive damage properties are related to a parameter that is not in Abaqus GUI. Analyzing soil that the elastic modulus is related to its depth is a practical example. You will learn how to code these two subroutines as well as the differences between them. In addition, you will be able to change one of them to another. To sum up, using the USDFLD subroutine, there will be no limitation for you to simulate models containing variables function to other parameters. In addition, we explain how to get access to the interfaces of subroutines, essential settings in GUI, get familiar with each subroutine’s parameters, etc.

Abaqus USDFLD and VSDFLD have a very broad scope, and in general, you can use these two subroutines whenever you a parameter in the software material environment that you want to rely on another variable. The difference between the two subroutines is in their solver, where Abaqus standard and Abaqus Explicit solvers use USDFLD and VUSDFLD, respectively. You will learn about how to connect Abaqus and subroutine, as well as an overview of subroutine writing in Abaqus.

Workshop 1 Simulation of elastic properties of soil in different depths with USDFLD subroutine :

In this workshop, we will use a simple example to use the USDFLD subroutine. We compare two Abaqus GUI and subroutine methods for simulating soil with changing modulus of elasticity at different depths under compressive loading. At last, we compare the results in both models.

Workshop 2 analyzing a crack path in Spherical FGM:

We will model a functionally graded material (FGM) with a crack on its spherical geometry in this workshop. The USDFLD subroutine is used since we wanted to simulate this by the Abaqus standard. In this model, pressure is applied from the inner part of an empty sphere, and the distribution of stress in this sphere is discussed. Further, the XFEM method is used to define the material for crack and to locate a crack in the Interaction module. In this exercise, we’ve also discussed parameters related to crack analysis and finally checked the results.

Workshop 3 composite shell plane explosion with a sticky connector in the layers:

In this workshop, the main subject is to use the VUSDFLD subroutine to damage an explosive structure as we used Abaqus Explicit solver. In this model, we show how to use the VGETVRM subroutine in the VUSDFLD subroutine. Furthermore, we explain utterly how to define different possible conditions based on damage numbers in subroutines of the VUSDFLD. Finally, view the deflection results and other variables in composite layers.

Get more basic information about Abaqus subroutine writing

The Abaqus user subroutine allows the program to be customized for particular applications unavailable through the main Abaqus facilities. You should write a user subroutine if you could not run your analysis by ABAQUS built-in models for materials, loads, properties, elements, etc., for example, if you need to model a user-defined nonlinear stress-strain relation, which is not provided by Abaqus, then look for UMAT user subroutine. A more advanced subroutine is USDFLD, which allows the creation of user-defined fields to simulate models in which the properties of their materials are related to some parameters or conditions. If it is your first time writing a subroutine like USDFLD, please read the Start Writing an Abaqus Subroutine: Basics & Recommendations article. After reading this post and watching this tutorial’s demo video, you will definitely decide to save time in Abaqus modeling and get this USDFLD training package. If you have questions, ask here on our live chat on the left side of this page.

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

You can watch demo here.

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Introduction

  • When do you need to use?
  • How to use USDFLD and VUSDFLD Subroutines?
  • What is the difference between USDFLD and VUSDFLD Subroutines?
  • How to convert USDFLD and VUSDFLD and vice versa?
  • How to use in example step by step
  • How to verify the subroutine with ABAQUS Software?

Workshop 1: Simulation of elastic properties of soil in different depth with USDFLD subroutine

  • How to use USDFLD subroutine in a simulation?
  • How to connect subroutine to Abaqus software?
  • What is the benefit of using a subroutine?
  • How to relate soil elastic modules to its depth?

Workshop 2 analyzing a crack path in Spherical FGM

  • How to analyze a n FGM model?
  • How to define a formula in the USDFLD subroutine?
  • How to relate material property of a sphere to its radius?
  • Verify the subroutine and export results from visualization module in ABAQUS

Workshop 3: Composite shell plane explosion with a sticky connector in the layers.:

  • How to define material property in varying criterion status?
  • How to use the VGETVRM inner subroutine?
  • How to define cohesive properties while using subroutines?
Additional information
Expert

Produced in Partnership Plan

Included

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

Tutorial video duration

120 Minutes

language

English

Level

Advanced

Package Type

Training

Software version

Applicable to all versions

Subtitle

English

Reviews (5)

5 reviews for Introduction to USDFLD and VUSDFLD Subroutine

  1. Rated 5 out of 5

    cheng uangli – July 28, 2021

    The workshops in this package were so rich. I could not find them somewhere else.

  2. Rated 4 out of 5

    wang zhang – August 1, 2021

    I am a mechanical engineer and I bought this package. I learned a lot from this package include modeling and simulating FGM and fatigue in various situations.
    Thanks CAE Assistnat Team!!

  3. Rated 5 out of 5

    vogel – January 25, 2023

    Excellent course. Useful content and explanations, and covers lots of details and recommendations.
    Although, naturally, engineering knowledge is fundamental!

  4. Rated 5 out of 5

    luis.var – January 29, 2023

    I have years of experiences in working with ABAQUS, and I took this course to learn more about the structural analysis. Course developer is very generous !! but I expect more example.

  5. Rated 5 out of 5

    sam.zayn – February 1, 2023

    the course were well defined and each of he sections were explained good way to make user understand about the concept.

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SKU: AR2942 Categories: Civil Engineering, Cohesive, Composite, Dynamic Analysis, Explosion, Fatigue, Fracture/Failure, Mechanical Enginerring, Subroutine Tags: ABAQUS, Cohesive, Damage, explosion, fatigue, FORTRAN, getvrm, hashin, khoramishad, SUBROUTINE, USDFLD, vgetvrm, VUSDFLD

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[optin-monster slug="khin3hlh6o8vag5wx9gj" followrules="true"]This package is usable when the material model is not available in ABAQUS software. If you follow this tutorial package, including standard and explicit solver, you will have the ability to write, debug and verify your subroutine based on customized material to use this in complex structures. These lectures are an introduction to write advanced UMAT and VUMAT subroutines in hyperelastic Martials, Composites and Metal and so on.

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