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Introduction to UEL SUBROUTINE in ABAQUS
Introduction to UEL SUBROUTINE in ABAQUS
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HomeSubroutine Introduction to UEL Subroutine in ABAQUS
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Introduction to UEL Subroutine in ABAQUS

Rated 5.00 out of 5 based on 8 customer ratings
(8 customer reviews)

€ 210

UEL stands for User-defined Elements. When you have a finite element analysis that requires an element type that doesn’t exist in the Abaqus element library, you must write a UEL subroutine. Or, when you want to define various element shape functions, the UEL would be the best choice. This subroutine is one of the most sophisticated in the Abaqus and is intended for advanced users. With this tutorial package, you can become an advanced user and learn how to write such a complex subroutine. This package contains two workshops: writing a UEL subroutine for a planar beam element with nonlinear section behavior and writing a UEL subroutine for a beam element with specific boundary conditions and loading.

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  • Description
  • Additional information
  • Reviews (8)
  • Shipping and Delivery
Description

Introduction to UEL Subroutine in ABAQUS

The UEL subroutine is one of the most difficult subroutines in Abaqus(Like UMAT and UMESHMOTION). So, usually, advanced users try to use it. This training package help users to learn the Abaqus UEL subroutine easily, step by step.
In this Subroutine, element-based equations and relationships between the element stiffness and node forces should be defined.

This subroutine will be called for each element that is of a general user-defined element type each time element calculations are required and should perform all of the element calculations to appropriate in the current activity of the analysis.

In this subroutine, the properties of the material change to an arbitrary dependent variable.
You can find the demo of this package here(Watch Demo). It should be mentioned the general information is available in Abaqus Documentation.

Workshop 1: Writing the subroutine for planar beam element with nonlinear section behaviour

In this workshop, initial equations are introduced after the problem description is complete. Then, the required variables are matrixes like element stiffness matrix, and the internal force vector is calculated.
In the subroutine section of the workshop, all variables and parameters used in the UEL subroutine are introduced, and the subroutine is explained line by line. You will learn the settings in the input file and GUI of Abaqus/CAE. Finally, the UEL subroutine results are compared and verified with Abaqus usage.

Workshop 2: Writing the subroutine for beam Element with specific boundary conditions and loading

Like the previous workshop, the problem has been described, and the main equations to calculate the element stiffness matrix are used. It should be mentioned the load is also defined in the subroutine.
In the next step, the problem has been solved with an analytical solution, and All parameters and variables are defined. In this workshop, users learn to write and store some results like stress in the .dat file for specific elements or nodes. Finally, the results are verified with Abaqus.

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 UEL, which allows the creation of user-defined elements. If it is your first time writing a subroutine like UEL 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 your time in Abaqus modelling and get this UEL training package. If you have questions, ask here on our live chat on the left.

1-3. Examples of UEL usage

Some examples of Abaqus UEL usage:

Here, we have listed examples of using Abaqus UEL subroutines in scholarly research. You can get some idea about that, but notice this package does not cover the below topics, and this section is just for your information.

    1. The UEL subroutine was developed to model the Phase-field modeling (PFM) and Theory of Porous Media (TPM) for brittle fracture simulation. The UEL subroutine was used to expand the existing fracture techniques to handle large-scale actual engineering issues requiring a significant number of degrees of freedom.
    2. An investigation was done that can predict clay/epoxy nanocomposites’ tensile strength with the help of the ABAQUS subroutines UEL and UMAT. The UEL subroutine modeled a phase-field model for brittle fracture simulation.
    3. Computer simulations are used by civil engineers to forecast how structures that are vulnerable to earthquake excitation would behave. Only a tiny section of the ground affected by the earthquake can be mapped onto a computational domain in order to keep the size of the computer model within reasonable constraints; the remainder must be captured by an artificial boundary condition. To model seismic wave propagation in an elastic medium, absorbing boundary conditions are necessary. The Abaqus UEL subroutine is likely the only modification in ABAQUS with the capabilities needed to implement advanced boundary conditions.

4-5. Examples of UEL usage

4. The peridynamic finite element technique (PDFEM), which establishes the peridynamic (PD) multi-bond element stiffness matrix and the unbalanced force vector, is based on the idea of the lowest potential energy. An adjusting technique of the PD element stiffness matrix is introduced to achieve the exchange of physical information at joint points between PD elements and classical continuum mechanics (CCM) elements in a unified finite element framework. For modeling fracture and damage in the context of PD theory and coupling PD grids with CCM meshes, PDFEM can be used to create a new PD element type through the Abaqus UEL subroutine.

5. To perform sensitivity analysis for mechanical and structural systems experiencing creep deformation, the complicated finite element method (ZFEM) has been expanded. Shape, material, and loading derivatives of the system response are provided by ZFEM using a complicated finite element formulation, giving users insight into the key elements that govern the system’s behavior as a function of time. The finite element software Abaqus contains a complicated variable-based quadrilateral user element (UEL) subroutine that implements the power law creep constitutive formulation.

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 we need to use?
  • How does UEL Subroutine works?
  • What is the element jacabian in UEL and how to calculate that?
  • What is the UEL subroutine interaface?
  • Which variables should be defined and which one is optional in UEL subroutine of ABAQUS?
  • What are the tips o use UEL subroutine?
  • Introduction to UEL variables one by one with example!
  • User Element definition definition in input file
  • UEL conventions
  • Defining the user element behaviour

Workshop 1: Writing UEL subroutine for planar beam element with nonlinear section behaviour

  • Problem description
  • Initial equations to write subroutine
  • Calculation of element matrix stiffness
  • Calculation of internal fore vector
  • Definition of all variables and parameters used in the UEL subroutine
  • Writing the subroutine line by line
  • ABAQUS GUI settings
  • ABAQUS input file settings
  • Verify the subroutine and export results from visualization module in ABAQUS
  • Discussion about the results

Workshop 2: Beam Element with specific boundary conditions and loading

  • Problem description
  • Main equations to write subroutine
  • Calculation of stiffness matrix
  • Calculation of external force
  • How to add force in UEL subroutine instead of GUI
  • Analytical solution of problem
  • All parameter and variables UEL subroutine defenition
  • How to write and store some results like stress in dat file for specifiec elments or nodes span
  • Writing the subroutine line by line
  • Verify the subroutine and export results from visualization module in ABAQUS and comparing with results of GUI
Additional information
Expert

Produced in Partnership Plan

Included

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

Tutorial video duration

180 Minutes

language

English

Level

Advanced

Package Type

Training

Software version

Applicable to all versions

Subtitle

English

Reviews (8)

8 reviews for Introduction to UEL Subroutine in ABAQUS

  1. Rated 5 out of 5

    Dharmesh Rajput – June 3, 2021

    There is almost no information on the Internet about this subroutine. This package helped me to do my project. Will more advanced workshops be added to this package?

    • Experts of CAE Assistant Group – June 3, 2021

      The advanced UEL subroutine in ABAQUS will be prepared soon…

  2. Rated 5 out of 5

    PAUL MOORS – June 7, 2021

    Thank you very much. This Subroutine is very complex. This training package helped me to understand this complex subroutine more easily.\ (•◡•) /

    • Experts of CAE Assistant Group – June 7, 2021

      I am glad to have helped you

  3. Rated 5 out of 5

    arie.kang – November 23, 2022

    Thanks! But why didn’t you put a workshop on a practical example from the real world to better understand when we need this subroutine?

  4. Rated 5 out of 5

    Darja – December 10, 2022

    You have done a great job! Do you accept custom packages or at least give companies some kind of assistance in their projects?

  5. Rated 5 out of 5

    issey.Saitō – December 19, 2022

    I think this package is perfect for scholars, professors, and even industrial companies. If you haven’t used subroutine before or any advanced ones like UMAT, don’t use this one now.

  6. Rated 5 out of 5

    Dave.Faez14 – December 28, 2022

    I really needed this subroutine for my project. Thank you. Can I contact your experts to help me out with my project?

  7. Rated 5 out of 5

    Peter – January 11, 2023

    hi everyone, If you haven’t used subroutine before or any advanced ones like UMAT, don’t use this one now.

  8. Rated 5 out of 5

    jackson-3251 – January 18, 2023

    I recommend this package. It contains examples’s files and English subtitle.

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All the package includes Quality assurance of training packages. According to this guarantee, you will be given another package if you are not satisfied with the training, or your money is returned. Get more information in terms and conditions of the CAE Assistant.
All packages include lifelong support, 24/7 support, and updates will always be sent to you when the package is updated with a one-time purchase. Get more information in terms and conditions of the CAE Assistant.

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SKU: AU3606 Categories: Civil Engineering, Mechanical Enginerring, Subroutine Tags: ABAQUS, SUBROUTINE

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VUEL abaqus
Introduction to VUEL Subroutine in ABAQUS-Package
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Introduction to VUEL Subroutine in ABAQUS

Rated 4.50 out of 5
€ 210
VUEL is the UEL subroutine for the Explicit solver. UEL is for the Standard solver, and VUEL is for the Explicit solver. Of course, there are some other differences between these two subroutines as well, such as in inputs, variables, etc. This tutorial package is used for writing the most sophisticated subroutines in ABAQUS, VUEL, which are applicable to customized problems. The stiffness matrix and nodal forces are the output of the subroutine, which can be defined based on several variables. This tutorial package contains two workshops: the first is divided into three sections, which model truss elements, and the second workshop explains how to use VUEL and VUMAT subroutines in one model.
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