computational systems for special structural...
TRANSCRIPT
![Page 1: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/1.jpg)
VSB – TECHNICAL UNIVERSITY OF OSTRAVA
FACULTY OF CIVIL ENGINEERING
Computational systems for specialstructural problemsMaterial for practice: ANSYS
Petr Konečný, Jiří Brožovský
Office: LP H407/3Phone: 597 321 384
E-mail: [email protected]://www.fast.vsb.cz/konecny
![Page 2: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/2.jpg)
Credit conditions
• sufficient presence
• preparation of project
• presentation and defence of prepared project
2
![Page 3: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/3.jpg)
Outline of class
• progressive procedures when using software (automation
of work, user macros etc.)
• nonlinear tasks: plasticity, large deformations, contact pro-
blems
• other special tasks
3
![Page 4: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/4.jpg)
ANSYS system (1)
• commercial general multi purpose finite element system (no
codes etc.)
• software and documentation in English
• large number of finite element types for various tasks
• the mesh and its type may be directly controlled
• contact tasks
• static, dynamic, heat conduction,...
• linear and nonlinear tasks
• own command language (allows for macros preparation, sup-
portive codes)
4
![Page 5: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/5.jpg)
ANSYS system (2)
• help: help,něco (note.: in instalation at FAST is something not
working)
• use comma decimal separator
• dialog window invokes commands
• commands: n„5.3,6.3,7.7 (parameter delimiter is comma. . . )
• empty fields will be filled with zero (if parameter is real number)
or closest empty value (if parameter is index or ordinal number)
• parametrs of commands as well as input fields in dialogues
accepts mathematic expressions (FORTRAN language): 5 ∗
∗2 = 25 or 1+ 3 ∗ 2/3 = 3 etc.
5
![Page 6: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/6.jpg)
ANSYS system (3)
Recommended finite element types:Task Type Numberplannar truss LINK1 13D truss LINK8 8plannar frame BEAM3 33D frame BEAM4 3, 188, 189planar problem PLANE42 42, 182slab SHELL63,. . . 63, 93, 181slab on Winkler’s subsoil SHELL63 63volumes SOLID45,. . . 45, 95, 185volumes from concrete SOLID65,. . . 65
For the parameters of elements, allowable analysis types and
results type: help,number6
![Page 7: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/7.jpg)
Commands ANSYS 1:selected objects
Object Letter Examplekey point k k„1,1,2 kdel,p klistline l l,1,2 l,p ldel,allarea a a,1,2,3,4 a,p adel,pvolume v v,p vdel,all vlistnode n n„0,0,7.7 nlist ndel,allelement e e,1,7 e,p edel,allnode support d d,p dlist ddel,pnodal force f f,p flist fdel,p
7
![Page 8: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/8.jpg)
Commands ANSYS 2:selected operations
Operation Abreviation Examplescreation k„1,1,2 l,1,2 a,1,2,3,4creation with mouse ,p l,p a,p v,p e,p d,pdeletion del ldel,3 ldel,p ldel,alllisting list alist nlist elistplotting plot aplot nplot eplot gplot
8
![Page 9: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/9.jpg)
Commands ANSYS 3:selected operations
Operation Commandpreprocessor initiation /prep7solver initiation /solusolution solvepostprocessor initiation /post1saving of project saveresuming project resu
9
![Page 10: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/10.jpg)
Commands ANSYS 4:selected operationsSaving and reading a data in the form of command file database
– might demand larger disk space however, it is better transferable
between ANSYS versions.
Operation Commandsaving of data cdwrite,DB,soubor,cdbreading of data cdread,DB,soubor,cdb
Where „file“ is the name of the file and „cdb“ is its extension (např.
mymodel.cdb)10
![Page 11: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/11.jpg)
Example 1: Planar truss (1)
10kN 10kN
5 kN
2m
3m
2m 2m
Properties: E = 20 GPa,A = 0.01 m2.
11
![Page 12: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/12.jpg)
Example 1: Planar truss (2)
Properties: E = 20 GPa,A = 0.01 m2. We will assign 1 type
of finite element, 1 type of material and 1 set of real constants:
• Preprocessor initiation: /prep7
• Element selection (LINK1): et,1,LINK1
• Youngus modulus assignment E = 20 GPa: mp,EX,1,20e9
• Cross-sectional area assignment A = 0.01 m2: r,1,0.01
Notes: material properties use stadndardized identifiers (EX, EY, EZ. . . for moduli of elasti-
city, PRXY. . . coefficient of lateral contraction, DENS. . . density), sequence and meaning of real
constants are specific for specific element type (see help).
12
![Page 13: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/13.jpg)
Example 1: Planar truss (3)
Numbering of nodes (red) and elements (blue):
10kN 10kN
5 kN
2m
3m
2m 2m
5 6
21 431
2 3
4
5
6
7
8
9
13
![Page 14: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/14.jpg)
Example 1: Planar truss (4)
Modeling of nodes:
10kN 10kN
5 kN
2m
3m
2m 2m
5 6
21 431
2 3
4
5
6
7
8
9
n„0,0
n„2,0
n„4,0
n„6,0
n„2,3
n„4,3
14
![Page 15: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/15.jpg)
Example 1: Planar truss (5)
Modeling of elements:
10kN 10kN
5 kN
2m
3m
2m 2m
5 6
21 431
2 3
4
5
6
7
8
9
Easygoing: e,p and clicking the nodes.
e,1,2
e,1,5
e,2,5
e,2,3
e,2,6
e,5,6
e,3,6
e,3,4
e,4,6
15
![Page 16: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/16.jpg)
Example 1: Planar truss (6)
Modeling of supports:
10kN 10kN
5 kN
2m
3m
2m 2m
5 6
21 431
2 3
4
5
6
7
8
9
Easygoing: d,p and clicking the nodes.
d,1,ux
d,1,uy
d,4,uy
16
![Page 17: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/17.jpg)
Example 1: Planar truss (7)
Modeling of loading:
10kN 10kN
5 kN
2m
3m
2m 2m
5 6
21 431
2 3
4
5
6
7
8
9
Easygoing: f,p and clicking the nodes.
f,5,fy,-10e3
f,6,fy,-10e3
f,6,fx,-5e3
17
![Page 18: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/18.jpg)
Example 1: Planar truss (8)
18
![Page 19: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/19.jpg)
Example 1: Planar truss (9)
Solution:
• Preprocessor exit: fini
• Solver initiation: /solu
• Solution: solve
19
![Page 20: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/20.jpg)
Example 1: Planar truss (10)
Postprocessing results:
• Solution exit: fini
• Postprocessor initiation: /post1
• Total deformation plot: plns,u,sum,1Note to plns:
• 1 et the end means „draw nondeformed elements“; value 2 would means „draw onlyoutline of the structure“.
• instead of sum (total deformation) might be specified direction (x, y, z) – selectioninfluences the colors and values, not the shape of deformation.
20
![Page 21: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/21.jpg)
Example 1: Planar truss (11)
21
![Page 22: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/22.jpg)
Example 1: Planar truss (12)
Internal forces using Element Table:
• Parameter definition NX: etable,nx,smisc,1
• Plotting NX by elements: plls,NX,NX
• Total deformation plotting : plns,u,sum,1
22
![Page 23: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/23.jpg)
Example 1: Planar truss (13)
23
![Page 24: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/24.jpg)
Example 1: Planar truss (14)
List of results:
• Reactions: prrs
• Deformations: prns,ux
• Internal forces list: pretab,NX
24
![Page 25: Computational systems for special structural problemsfast10.vsb.cz/konecny/files/vssu-en/cv1_en.pdf · VSB – TECHNICAL UNIVERSITY OF OSTRAVA FACULTY OF CIVIL ENGINEERING Computational](https://reader034.vdocuments.site/reader034/viewer/2022042709/5f4a3754ffebf041dd20b341/html5/thumbnails/25.jpg)
Commands: how to invoke, whereto find• File name.mac in working folder of ANSYS.
• It can be called by name and the commands contained in the
file will be executed.
• Command history: jobname.log in ANSYS working folder.
• Warning: circa from version 9 cannot be this file used directly
(<CTRL>C, <Ctrl>V), it needs to be modified (there is P51X
instead of list of selected elements etc.).
25