ABAQUS tutorial

Description

ABAQUS tutorial EN175: Advanced Mechanics of SolidsDivision of Engineering Brown UniversityABAQUS tutorial1. What is ABAQUS?ABAQUS is a highly sophisticated, general purpose finite element program, designed primarily to model the behavior of solids and structures under externally applied loading. ABAQUS includes the following features: Capabilities for both static and dynamic problems The ability to model very large shape changes in solids, in both two and three dimensions A very extensive element library, including a full set of continuum elements, beam elements, shell and plate elements, among others. A sophisticated capability to model contact between solids An advanced material library, including the usual elastic and elastic – plastic solids; models for foams, concrete, soils, piezoelectric materials, and many others. Capabilities to model a number of phenomena of interest, including vibrations, coupled fluid/structure interactions, acoustics, buckling problems, and so on. The main strength of ABAQUS, however, is that it is based on a very sound theoretical framework As an practicing engineer, you may be called upon to make crucial decisions based on the results of computer simulations. While no computer program can ever be guaranteed free of bugs, ABAQUS is among the more trustworthy codes. Furthermore, as you will see if you consult the http://www.engin.brown.edu/courses/En175/Abaqustut/abaqustut ...

Informations

• Publié par: Unfo
• Nombre de lectures: 59
• Langue: English

Extrait

ABAQUS tutorial                       N1 E: 75avdAdecn  03204//1069::5 8o 1( mth5[ )14 f

ABAQUS tutorial

  

The main strength of ABAQUS, however, is that it is based on a very sound theoretical framework As an practicing engineer, you may be called upon to make crucial decisions based on the results of computer simulations. While no computer program can ever be guaranteed free of bugs, ABAQUS is among the more trustworthy codes. Furthermore, as you will see if you consult the

 Capabilities to model a number of phenomena of interest, including vibrations, coupled fluid/structure interactions, acoustics, buckling problems, and so on.

ABAQUS is a highly sophisticated, general purpose finite element program, designed primarily to model the behavior of solids and structures under externally applied loading. ABAQUS includes the following features:

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 Capabilities for both static and dynamic problems

1. What is ABAQUS?

Division of Engineering     Brown University

Mechanics of Solids

 A very extensive element library, including a full set of continuum elements, beam elements, shell and plate elements, among others.

 An advanced material library, including the usual elastic and elastic – plastic solids; models for foams, concrete, soils, piezoelectric materials, and many others.

 A sophisticated capability to model contact between solids

 The ability to model very large shape changes in solids, in both two and three dimensions

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First, you will use ABAQUS to solve the following problem. A thin plate, dimensions , contains a hole of radius 1cm at its center. The plate is made from steel, which is idealized as an elastic—strain hardening plastic solid, with Young’s modulus E=210 .GPa and Poisson’s ratioThe uniaxial stress—strain curve for steel is  idealized as a series of straight line segments, as shown below.

In this tutorial, you will learn how to run ABAQUS/Standard, and also how to use ABAQUS/Post to plot the results of a finite element computation.

2. Tutorial Overview

ABAQUS is written and maintained by Hibbitt, Karlsson and Sorensen, Inc (HKS), which has headquarers in Pawtucket, RI. The company was founded in 1978 (by graduates of Brown’s Ph.D. program in solid mechanics), and today has several hundred employees with offices around the world.

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Observe that the plate and the loading is symmetrical about horizontal and vertical axes through the center of the plate. We only need to model ¼ of the plate, therefore, and can apply symmetry boundary conditions on the the bottom and side boundaries. The finite element mesh you will use for your computations is shown below. The elements are plane stress, 4 noded quadrilaterials. Symmetry boundary conditions are applied as shown, and distributed tractions are applied to the rightmost boundary.

We will specifically request ABAQUS to print the state of the solid at timet=1, t=2and t=3the development of plasticity in the plate., to see

You may recall that a circular hole in a plate has a stress concentration factor of about 3. At timet=1, therefore, the stress at point A should just reach yield (the initial yield stress of the plate is 200MPa). At timet=3,the load should be enough to cause a significant portion of the plate to yield.

The magnitude of the loading increases linearly with time, as shown.

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Run the program. On Windows NT, ABAQUS is controlled by typing commands into a DOS type window.

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The ABAQUS input file that sets up this problem will be provided for you. You will run ABAQUS, and then use ABAQUS/Post to look at the results of your analysis. Next, you will take a detailed look at the ABAQUS input file, and start setting up input files of your own. After completing this tutorial, you should be in a position to do quite complex two and three dimensional finite element computations with ABAQUS, and will know how to view the results. We will continue using ABAQUS to solve various problems throughout the rest of this course.

Create an input file.works by reading and responding to a set of commandsABAQUS (called KEYWORDS) in an input file. The keywords contain the information to define the mesh, the properties of the material, the boundary conditions and to control output from the program. To see the ABAQUS input file for the plate problem,click here.

3. Steps in running ABAQUS

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4. Downloading the sample ABAQUS input file.

1. Open an MS/DOS window on your workstation (the command to open the window is located in the Start menu on your toolbar). 2. Type mk ABAQUS in the MS/DOS window. If the command _ executes correctly, icons to start ABAQUS and to open the ABAQUS documentation should appear on your desktop. In addition, a directory called ABAQUS should be created in your home directory.

4. Exit the text editor. 

BEFORE RUNNING ABAQUS FOR THE FIRST TIME:

 

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3.In the Abaqus Command window, type

2.In the Abaqus Command window, change directories to ABAQUS\tutorial.

Your Prompt > abaqus[return] Identifier:tutorial [return] User routine file:[return]

tutorial.inp tutorial.dat tutorial.log tutorial.res tutorial.bat tutorial.sta tutorial.msg tutorial.fil

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