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AE4131
ABAQUS Lecture
Part I
Patrick [email protected]
x5-2773
Weber 201
mailto:[email protected]:[email protected] -
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Overview
What isABAQUS?
Why learnABAQUS?
ABAQUS documentation and onlineresources
Solver structure
How to build a simple model
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What isABAQUS?
TheABAQUS suite of software for finite elementanalysis (FEA) is known for its high performance,quality and ability to solve more kinds ofchallenging simulations than any other software.
TheABAQUS suite consists of three coreproducts: ABAQUS/Standard,ABAQUS/ExplicitandABAQUS/CAE. Each of these packages offersadditional optional modules that addressspecialized capabilities some customers mayneed.
(From www.abaqus.com)
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What isABAQUS?
ABAQUS/Standard, provides ABAQUS analysis technology to solvetraditional implicit finite element analyses, such as static, dynamics, thermal,all powered with the widest range of contact and nonlinear material options.ABAQUS/Standard also has optional add-on and interface products withaddress design sensitivity analysis, offshore engineering, and integrationwith third party software, e.g., plastic injection molding analysis.
ABAQUS/Explicit, provides ABAQUS analysis technology focused ontransient dynamics and quasi-static analyses using an explicit approachappropriate in many applications such as drop test, crushing and manymanufacturing processes.
ABAQUS/CAE, provides a complete modeling and visualization
environment for ABAQUS analysis products. With direct access to CADmodels, advanced meshing and visualization, and with an exclusive viewtowards ABAQUS analysis products,ABAQUS/CAE is the modelingenvironment of choice for many ABAQUS users.
(From www.abaqus.com)
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Why learnABAQUS?
Experience has shown thatABAQUS is
the easiest FEA software package to
learn.
Very good online documentation
Small learning curve which means you can
model much faster.
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Solver Structure
Standard
Command
lineABAQUS
CAE
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Beam example
20,000 lbs
Steel beam, Youngs modulus 30x106 lbs/in2
Length 100 inches, width = 1 inch, height = 2 inches
x, 1
y, 2
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Beam example
I want to know stresses and strains along
the x-direction and the forces and moments
in each section of the beam due to a static
load.
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Sketch out your FEA model
20,000 lbs
x, 1
y, 2
1 2 3 4 5
61 2 3 4 5
Nodes
Elements
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ABAQUS has a large library of elements
(From ABAQUS documentation)
Ill pick B31 2-node linear beam
Pick your elements
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Simple Input file (Model data)
*HEADING
CANTILEVER BEAM**
** This is in inches
**
*NODE
1, 0.
6, 100.
*NGEN, NSET=allnodes
1, 6
*ELEMENT, TYPE=B31
1, 1, 2
*ELGEN, ELSET=BEAM
1, 5
*BEAM SECTION, SECTION=RECTANGULAR, ELSET=BEAM, MATERIAL=STEEL1., 2.
*MATERIAL, NAME=STEEL
*ELASTIC
30.E6,
*BOUNDARY
1, ENCASTRE
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Simple Input file (History Section)*STEP, PERTURBATION
*STATIC
**
** The load is in pounds
**
*CLOAD
6, 2, -20000.
*EL PRINT, POSITION=AVERAGED AT NODES, SUMMARY=YES
S11, E11SF,
*NODE FILE, NSET=allnodes
U, CF, RF
*OUTPUT, FIELD, VARIABLE=PRESELECT
*ELEMENT OUTPUT
SF,
*OUTPUT, HISTORY
*NODE OUTPUT, NSET=allnodes
U, CF, RF
*END STEP
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The resultsYou will get many files after your job is complete.
.dat Contains results information you can read. Veryimportant for debugging.
.fil Only for the computer
.com Only for the computer
.odb Only for the computer but will be used by CAE
.msg Contains information you can read about how thejob ran. Can be important for debugging.
.prt Only for the computer
.sta Contains information you can read about the statusof the job while running
.log Contains information you can read about how thejob ran. Can be important for debugging.
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A truss problem
200 lbs
100 lbs
x, 1
y, 2
Steel truss segments, Youngs modulus 30x106 lbs/in2
Diameter of each truss is 1 inch
20 in.
20 in.
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Beam example
I want to know stresses and strains in all
truss segments due to the static loads
shown in the figure.
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(From ABAQUS documentation)
Ill pick T3D2 2-node linear displacement
Pick your elements
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Modal Section*HEADING
CANTILEVER BEAM
**** This is in inches
**
*NODE
1, 0., 0.
6, 100., 0.
7, 0., 20.
12, 100., 20.
*NSET, NSET=FIXED
1, 7
*NGEN, NSET=allnodes
1, 6
7, 12
*ELEMENT, TYPE=T3D2, ELSET=BEAM
1, 1, 2
2, 2, 33, 3, 4
4, 4, 5
5, 5, 6
6, 7, 8
7, 8, 9
8, 9, 10
9, 10, 11
10, 11, 1211, 1, 8
12, 2, 9
13, 3, 10
14, 4, 11
15, 5, 12
16, 6, 12
17, 2, 8
18, 3, 9
19, 4, 10
20, 5, 11
*SOLID SECTION, ELSET=BEAM,
MATERIAL=STEEL
1.,
*MATERIAL, NAME=STEEL
*ELASTIC30.E6,
*BOUNDARY
FIXED, ENCASTRE
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History Section
*STEP, PERTURBATION
*STATIC
**
** The load is in pounds
**
*CLOAD
6, 1, 200.12, 2, -100,
*EL PRINT, POSITION=AVERAGED AT NODES, SUMMARY=YES
S, E
*NODE FILE, NSET=allnodes
U, CF, RF
*OUTPUT, FIELD, VARIABLE=PRESELECT
*ELEMENT OUTPUTS, E
*OUTPUT, HISTORY
*NODE OUTPUT, NSET=allnodes
U, CF, RF
*END STEP
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Looking at the results files
Starting with the .log file you should reviewthe results files.
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Models with continuum elements
To model most 3D structures that are
bending Continuum or brick elements are
the best.
Each element requires any nodes.
Models can be made by hand rather than
CAE but can take much longer.
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Continuum Elements
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3D Cantilever Beam Model data
*HEADING
cantilever beam**
** Coordinates are in
inches
**
*NODE
1, 0.,0.,0.193, 0.,0.,24.
1601, 2.,0.,0.
1793, 2.,0.,24.
8001, 0.,0.5,0.
8193, 0.,0.5,24.
9601, 2.,0.5,0.
9793, 2.,0.5,24.
**
** Create nodes for beam
***NGEN,NSET=FIX1
1,1601,200
*NGEN,NSET=FIX2
8001,9601,200
*NFILL,NSET=FIX
FIX1,FIX2,4,2000*NGEN,NSET=END1
193,1793,200
*NGEN,NSET=END2
8193,9793,200
*NFILL,NSET=END
END1,END2,4,2000
*NFILL,NSET=CBEAM
FIX,END,192,1
**
*NSET, NSET=SENSOR
8993
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Model section (cont.)**
** Make master elements for beam
**
*ELEMENT,TYPE=C3D20R
1, 1,401,4401,4001, 5,405,4405,4005, 201,2401,4201,2001,205,2405,4205,2005, 3,403,4403,4003
**
** Create elements for beam
**
*ELGEN,ELSET=CBEAM1,4,400,1,48,4,10,2,4000,2000
*ELSET, ELSET=LOCSTRESS
2,3,12,22,32,42,52,62,13,23,33,43,53,63,2002,2003
2012,2022,2032,2042,2052,2062,2013,2023,2033,2043,2053,2063
**
** Material properties for steel
**
*SOLID SECTION, MATERIAL=STEEL, ELSET=CBEAM
*MATERIAL, NAME=STEEL
**
** Youngs modulus is in lbf/in^2
**
*ELASTIC
29.E6,0.3
**
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Student Accounts
Now you are ready to work the projects.
You can use your AE student account in
the AE Computer Lab (Knight 318) to runABAQUS on these systems.
Or you can get an account on the ECS
network (go to http://www.ecs.gatech.edu)