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Nonlinear buckling analysis NX7.5

Creator
Creator
Hello,

how to set up a nonlinear buckling analysis of a cantilever beam in NX 7.5?

Regards,

Stefan
2 REPLIES

Re: Nonlinear buckling analysis NX7.5

Siemens Builder Siemens Builder
Siemens Builder
Stefan,

Please see the NX Nastran Basic Nonlinear Analysis User's Guide. Section 5.3 covers Nonlinear Buckling and includes an example problem. The input deck for the example problem is delivered in the tpl.

The tpl also contains the following additional nonlinear buckling examples:

n10634.dat
n10634r.dat
n10657.dat
nlsolidb.dat
p3106b.dat
p3106br.dat
sbuckl2a.dat
sbuckld.dat
sbucklr.dat


Regards,
--
Jim Bernard
Advanced Applications Engineer

Siemens PLM Software
2000 Eastman Dr., Milford, OH 45150-2712
www.siemens.com/plm

Re: Nonlinear buckling analysis NX7.5

Siemens Phenom Siemens Phenom
Siemens Phenom
Stefan,

Nonlinear buckling in NX Nastran is setup through a basic nonlinear (106) solution sequence. The TPL directory of your NX Nastran installation contains many examples. I searched the directory for files named *106* and found p3106b.dat. The file is copied and pasted below. I'm not sure whether or not the formatting will survive...

Regards,
Mark

------------------------

ASSIGN OUTPUT2 ='DBSDIRSmiley Tongue3106b.op2', UNIT = 12, FORM = FORMATTED, DELETE
ID EDS, P3106B $ CJC 10-MAR-95 v682
$ID EDS, N6653 $ CJC 28-SEP-88
$ID EDS, BUCKL_SS $ GAD MAY86
$ID SBUCKL,V65 $ SHL 5/7/85
SOL 106 $
COMPILE DMAP=SEDRCVR,SOUIN=MSCSOU,NOLIST,NOREF $
$ALTER 104 $ Alter removed, recommended by MAR.
$TABPT OES1// $ FJA V707 28-NOV-1999
$ENDALTER $
$SOL 66 $
DIAG 8,50 $
TIME 30 $
CEND
TITLE=TEST FOR P3 SUPPORTED OUTPUT DATABLOCKS P3106B
SUBTITLE= SOL 106 BUCKLING
LABEL = PARAM,POST,-1 and PARAM,PATVER,3.0
ECHO=UNSORT
DISP(PLOT)=ALL
OLOAD(PLOT)=ALL
SPCF(PLOT)=ALL
STRESS(PLOT)=ALL
FORCE(PLOT) = ALL
STRAIN(PLOT) = ALL
GPSTRESS = ALL
SPC=10
SUBCASE 1
LOAD=20
NLPARM=2
SUBCASE 2
LOAD=30
NLPARM=5
SUBCASE 3
LOAD=40
NLPARM=10
OUTPUT(POST)
SET 1 ALL
SURFACE 1 SET 1
BEGIN BULK
PARAM,POST,-1
PARAM,PATVER,3.0
$ DEFINE SPHERICAL COORDINATE SYSTEMS
CORD2S 100 0. 0. 0. 0. 0. 1. +C2S1
+C2S1 1. 0. 1.
CORD2S 200 0. 0. -.32908 0. 0. 1. +C2S2
+C2S2 1. 0. 1.
$ DEFINE PLOT ELEMENT
GRID 1000 0. 0. 0. 123456
PLOTEL 1000 1000 100
$ GEOMETRY
GRDSET 100 345
GRID 100 200 1.1506 0. 0. 0 12456
GRID 101 200 1.1506 0.715 -5.
GRID 102 200 1.1506 0.715 5.
GRID 103 200 1.1506 1.43 -5.
GRID 104 200 1.1506 1.43 5.
GRID 105 200 1.1506 2.145 -5.
GRID 106 200 1.1506 2.145 5.
GRID 107 200 1.1506 2.86 -5.
GRID 108 200 1.1506 2.86 5.
GRID 109 200 1.1506 3.575 -5.
GRID 110 200 1.1506 3.575 5.
GRID 111 200 1.1506 4.29 -5.
GRID 112 200 1.1506 4.29 5.
GRID 113 200 1.1506 5.005 -5.
GRID 114 200 1.1506 5.005 5.
GRID 115 200 1.1506 5.72 -5.
GRID 116 200 1.1506 5.72 5.
GRID 117 200 1.1506 6.435 -5.
GRID 118 200 1.1506 6.435 5.
GRID 119 100 0.8251 10. -5.
GRID 120 100 0.8251 10. 5.
GRID 121 100 0.8251 11.48 -5.
GRID 122 100 0.8251 11.48 5.
GRID 123 100 0.8251 12.96 -5.
GRID 124 100 0.8251 12.96 5.
GRID 125 100 0.8251 14.44 -5.
GRID 126 100 0.8251 14.44 5.
GRID 127 100 0.8251 15.92 -5.
GRID 128 100 0.8251 15.92 5.
GRID 129 100 0.8251 17.40 -5.
GRID 130 100 0.8251 17.40 5.
GRID 131 100 0.8251 18.8806 -5.
GRID 132 100 0.8251 18.8806 5.
$ CONNECTIVITY
CTRIA3 10 2 100 101 102
CQUAD4 11 2 101 103 104 102
CQUAD4 12 2 103 105 106 104
CQUAD4 13 2 105 107 108 106
CQUAD4 14 2 107 109 110 108
CQUAD4 15 2 109 111 112 110
CQUAD4 16 2 111 113 114 112
CQUAD4 17 2 113 115 116 114
CQUAD4 18 2 115 117 118 116
CQUAD4 19 2 117 119 120 118
CQUAD4 20 2 119 121 122 120
CQUAD4 21 2 121 123 124 122
CQUAD4 22 2 123 125 126 124
CQUAD4 23 2 125 127 128 126
CQUAD4 24 2 127 129 130 128
CQUAD4 25 2 129 131 132 130
$ ELEMENT PROPERTIES
PSHELL 2 1 0.0251 1
MAT1 1 10.8+6 0.3
MATS1 1 PLASTIC 1.225+6 1 2 7.8+4
$ BOUNDARY AND LOADING CONDITIONS
SPC1 10 123456 131 132
PLOAD2 20 -2000. 10 THRU 25
PLOAD2 30 -3000. 10 THRU 25
PLOAD2 40 -4000. 10 THRU 25
$ PARAMETERS
PARAM LGDISP 1
$ SOLUTION CONTROL
NLPARM 2 2 AUTO UPW +NL11
+NL11 1.0E-3 1.0E-3 1.0E-7
NLPARM 5 5 AUTO UPW +NL12
+NL12 1.0E-3 1.0E-3 1.0E-7
$NLPARM 10 10 AUTO YES
NLPARM 10 10 AUTO 1 YES +NL13
+NL13 1.0E-2 1.0E-2 1.0E-2
NLPCI 10 ARC 30
$
ENDDATA