RBE2 does not expand in thermoelastic analysis

[presFEM]

Hi everyone,

I have defined a CTE (ALPHA) for the RBE2 element identical to the supporting structure but it expands in an unexpected manner and is failing the thermoelastic check. I am using MSC Nastran 2012.2.

Does any one know what could be happening?

Thanks in advance!



INIT MASTER(S)
NASTRAN OP2NEW=0
ID M,MSC
$SOL STATIC
SOL 101
TIME 10000
CEND

TITLE= THERM-ELAS CHECK
ECHO = PUNCH

TEMPERATURE(INIT) = 10

SUBCASE 1
$ DISPLACEMENT(PLOT) = ALL
SPC = 1001
TEMPERATURE(LOAD) = 100
DISPLACEMENT(SORT1,REAL)=ALL
SPCFORCES(SORT1,REAL)=ALL
STRESS(SORT1,REAL,VONMISES,BILIN)=ALL


BEGIN BULK

$

PARAM PRTMAXIM YES


PARAM,POST,-1
PARAM,OGEOM,NO
PARAM,AUTOSPC,YES $ORIGINAL MODEL
PARAM,MAXRATIO,1.E+8
PARAM, COUPMASS, 1
PARAM,K6ROT,10.
PARAM,GRDPNT,0
PARAM,PRGPST,NO
PARAM,PRTPCOMP,1

$ Elements and Element Properties for region : conm2.19
CONM2 9100001 100001 8 .2875 0. 0. 0.
0. 0. 0. 0. 0. 0.


PSHELL* 3 88888888 .03008 88888888
* 1. 88888888 1. 2.9
-.01504 .01504
$ Pset: "pshell.100013.22" will be imported as: "pshell.3"
CQUAD4 110303 3 110396 110397 110430 110429 5 0.
CQUAD4 110304 3 110397 110398 110431 110430 5 0.
CQUAD4 110305 3 110398 110399 110432 110431 5 0.
CQUAD4 110306 3 110399 110400 110433 110432 5 0.
CQUAD4 110307 3 110400 110401 110434 110433 5 0.
CQUAD4 110308 3 110401 110402 110435 110434 5 0.
CQUAD4 110309 3 110402 110403 110436 110435 5 0.
CQUAD4 110310 3 110403 110404 110437 110436 5 0.
CQUAD4 110334 3 110429 110430 110465 110464 5 0.
CQUAD4 110335 3 110430 110431 110466 110465 5 0.
CQUAD4 110336 3 110431 110432 110467 110466 5 0.
CQUAD4 110337 3 110432 110433 110468 110467 5 0.
CQUAD4 110338 3 110433 110434 110469 110468 5 0.
CQUAD4 110339 3 110434 110435 110470 110469 5 0.
CQUAD4 110340 3 110435 110436 110471 110470 5 0.
CQUAD4 110341 3 110436 110437 110472 110471 5 0.
$ Referenced Material Records
$ Material Record : mat2.100100013
$ Description of Material :


$ DUMMY ALU FOR THERMO-ELASTIC CHECK
$
$------$$------$$------$$------$$------$$------$$------$$------$$------$$------$
MAT1 88888888 70.0+9 26.9+9 1.0-5 0.0
$
$------$$------$$------$$------$$------$$------$$------$$------$$------$$------$
$ Multipoint Constraints of the Entire Model
$ ID conflict : the PATRAN MPC ID was 9100001
RBE2* 9900017 100001 123456 110430
* 110437 1.0-5
$ Nodes of the Entire Model
GRID 100001 -.185235-.13512 -.0125
GRID 110396 -.16667 -.202685.01504
GRID 110397 -.16667 -.18767 .01504
GRID 110398 -.16667 -.172658.01504
GRID 110399 -.16667 -.157644.01504
GRID 110400 -.16667 -.14263 .01504
GRID 110401 -.16667 -.127616.01504
GRID 110402 -.16667 -.112603.01504
GRID 110403 -.16667 -.097589.01504
GRID 110404 -.16667 -.082575.01504
GRID 110429 -.185235-.202685.01504
GRID 110430 -.185235-.187671.01504
GRID 110431 -.185235-.172658.01504
GRID 110432 -.185235-.157644.01504
GRID 110433 -.185235-.14263 .01504
GRID 110434 -.185235-.127616.01504
GRID 110435 -.185235-.112603.01504
GRID 110436 -.185235-.097589.01504
GRID 110437 -.185235-.082575.01504
GRID 110464 -.2038 -.202685.01504
GRID 110465 -.2038 -.187671.01504
GRID 110466 -.2038 -.172658.01504
GRID 110467 -.2038 -.157644.01504
GRID 110468 -.2038 -.14263 .01504
GRID 110469 -.2038 -.127616.01504
GRID 110470 -.2038 -.112603.01504
GRID 110471 -.2038 -.097589.01504
GRID 110472 -.2038 -.082574.01504
$ Loads for Load Case : Untitled.SC1
$ Displacement Constraints of Load Set : spc1.1001
$
$ Referenced Coordinate Frames
CORD2R 5 0. 0. 0. 0. 0. 1.
* 6.12323-17 1. 0.
*
CORD2R 6 .3765 -.548 -1.106 1.66696 -.548 -1.106
.3765 .742462 -1.106
CORD2R 7 -.3765 -.548 -.01 -1.3765 -.548 -.01
-.3765 .452 -.01
CORD2R 8 0. 0. 0. 0. 0. 1.
* 6.12323-17 1. 0.
*


$------$$------$$------$$------$$------$$------$$------$$------$$------$$------$
SPC1 1001 123456 110464

$------$$------$$------$$------$$------$$------$$------$$------$$------$$------$
TEMPD 10 0.0 100 100.0








PARAM,LSTRN,1
ENDDATA 00c02c0a

 

[Naffoussi]

just after CEND add RIGID=LAGRAN to take into account the CTE of RBE2 in your analysis...

Seif Eddine Naffoussi, Stress Engineer

http://www.Innovamech.com

33650 Martillac û France

 

[presFEM]

Thank you so much compositecurves!!!

It works now )

 

[Naffoussi]

you welcome

Seif Eddine Naffoussi, Stress Engineer

http://www.Innovamech.com

33650 Martillac û France

 

[Venkata2204]

I did the same. Even after adding RIGID = LAGRAN, it doesn't work for me.All the RBE2 elements in my model have the same CTE as the rest of the model.

My bdf looks like this:

SOL 101
$ Direct Text Input for Executive Control
CEND
ECHO = NONE
RIGID = LAGR
$ Direct Text Input for Global Case Control Data
TEMPERATURE(INIT) = 10
TEMPERATURE(LOAD) = 100
SUBCASE 1
TITLE=This is a default subcase.
SPC = 2
TEMPERATURE(LOAD) = 1
DISPLACEMENT(SORT1,REAL)=ALL
SPCFORCES(SORT1,REAL)=ALL
ESE=ALL
MPCFORCES(SORT1,REAL)=ALL
STRESS(SORT1,REAL,VONMISES,BILIN)=ALL
$ Direct Text Input for this Subcase
BEGIN BULK
PARAM POST 0
PARAM AUTOSPC NO
PARAM PRTMAXIM YES
$ Direct Text Input for Bulk Data
TEMPD,10,20.,100,120.


THe .f06 file shows this:

*** USER INFORMATION MESSAGE 4507 (GPFEV1)
IN SUBCASE 1
THERE ARE 2280 RBE1 ELEMENTS HAVING STRAIN ENERGY WHICH IS LESS THAN 1.000000E-03 PERCENT
OF THE TOTAL STRAIN ENERGY OF ALL ELEMENTS.
MAIN: "Access violation" (C0000005) exception encountered.
MAIN: For reference, A(MAINAL) = 401074, A(/SYSTEM/) = 4131460
MAIN: A(/XNSTRN/) = 80000000
MAIN: Exception occurred at address 000000000082585C.
MAIN: Program attempted to access data at location FFFFFFFFFFFFFFFF.
MAIN: Context Flags 0010005F
MAIN: The general registers, instruction pointer, and flags are --
MAIN: RAX 0000000000002600 RSP 000000000012E530 R8 0000000080000010 R12 0000000000000000
MAIN: RCX 0000000080000010 RBP 000000007E6DB1C0 R9 000025FD000025FC R13 0000000000000000
MAIN: RDX 0000000000400000 RSI 0000000080000010 R10 0000000000002600 R14 0000000000000000
MAIN: RBX 0000000000400000 RDI 000025FD00004BFC R11 0000000000000000 R15 0000000000000000
MAIN: RIP 000000000082585C EFLAGS 00010206 MXCSR F09F 0000
MAIN: The 32 bytes around exception location 000000000082585C are --
MAIN: 000000000082584C 89 C6 4C 8B 0D CB 87 7D 05 4C 63 D0 4B 8D 3C 11
MAIN: 000000000082585C 8B 8C BB 70 E0 BF 05 85 C9 74 5C 89 05 EF 4D 10
MAIN: The Streaming SIMD Extensions Registers are --
MAIN: XMM0 0000000040E4A91B 0000000000000000 XMM8 0000000000000000 0000000000000000
MAIN: XMM1 418FB05B50000000 0000000000000000 XMM9 0000000000000000 0000000000000000
MAIN: XMM2 0000000000000000 0000000000000000 XMM10 0000000000000000 0000000000000000
MAIN: XMM3 0000000000000000 0000000000000000 XMM11 0000000000000000 0000000000000000
MAIN: XMM4 0000000000000000 0000000000000000 XMM12 0000000000000000 0000000000000000
MAIN: XMM5 0000000000000000 0000000000000000 XMM13 0000000000000000 0000000000000000
MAIN: XMM6 0000000000000000 0000000000000000 XMM14 0000000000000000 0000000000000000
MAIN: XMM7 0000000000000000 0000000000000000 XMM15 0000000000000000 0000000000000000
MAIN: The 256 words on the stack, starting at 000000000012E530, are --
MAIN: 000000000012E530 80000000 00000000 04828738 00000000 04828734 00000000 04828730 00000000 *........8.......4.......0.......*
MAIN: 000000000012E550 00000000 00000000 80000010 00000000 05FFE010 00000000 80000010 00000000 *................................*
MAIN: 000000000012E570 00000000 00000000 0106582C 00000000 04828728 00000000 070DD01C 00000000 *........,X......(...............*
MAIN: 000000000012E590 04828730 00000000 00000001 00000000 00000001 00000000 00464630 00000000 *0.......................0FF.....*
MAIN: 000000000012E5B0 070DD004 00000000 00516087 00000000 070DE370 00000000 0046A2AA 00000000 *.........`Q.....p.........F.....*
MAIN: 000000000012E5D0 04828734 00000000 00000001 00000000 00000006 00000000 04828738 00000000 *4.......................8.......*
MAIN: 000000000012E5F0 04828730 00000000 00000001 00000000 00000004 00000000 00464630 00000000 *0.......................0FF.....*
MAIN: 000000000012E610 0000000E 00000000 00000000 00000000 03A94C84 00000000 0041536E 00000000 *.................L......nSA.....*
MAIN: 000000000012E630 04828734 00000000 00000000 00000000 00000006 00000000 04828738 00000000 *4.......................8.......*
MAIN: 000000000012E650 04828730 00000000 00000000 00000000 00000000 00000000 0000000D 00000000 *0...............................*
MAIN: 000000000012E670 00000001 00000000 7E6F4531 00000000 79EF1660 00000002 047C1D6C 00000000 *........1Eo~....`..y....l.|.....*
MAIN: 000000000012E690 070DD004 00000000 0046DF12 00000000 7E675B69 00000000 00469158 00000000 *..........F.....i[g~....X.F.....*
MAIN: 000000000012E6B0 00006482 00000000 0499E4A4 00000000 05FF8430 00000000 00000001 00000000 *.d..............0...............*
MAIN: 000000000012E6D0 04828734 00000000 04828730 00000000 0482872C 00000000 799D7630 00000002 *4.......0.......,.......0v.y....*
MAIN: 000000000012E6F0 799D7634 00000002 00000015 00000000 03A94C68 00000000 00469E47 00000000 *4v.y............hL......G.F.....*
MAIN: 000000000012E710 0012E800 00000000 03A94C88 00000000 7E6F7096 00000000 0046CFC9 00000000 *.........L.......po~......F.....*
MAIN: 000000000012E730 04828734 00000000 04828730 00000000 0482872C 00000000 03BDEAD0 00000000 *4.......0.......,...............*
MAIN: 000000000012E750 03BDEACC 00000000 03BDEAC8 00000000 0499E4CC 00000000 04B3050C 00000000 *................................*
MAIN: 000000000012E770 04B30514 00000000 03BDEB64 00000000 00000000 00000000 03BDE9D0 00000000 *........d.......................*
MAIN: 000000000012E790 03BDE9C8 00000000 03BDE9C0 00000000 03BDE9B8 00000000 00000000 00000000 *................................*
MAIN: 000000000012E7B0 00000000 00000000 0000000B 00000000 00000008 00000000 7761B2C2 00000000 *..........................aw....*
MAIN: 000000000012E7D0 00000001 00000000 00000001 00000000 00000001 00000000 000003FC 00000000 *................................*
MAIN: 000000000012E7F0 00000000 00000000 06F65420 00000000 05FFE010 00000000 00000000 00000000 *........ T......................*
MAIN: 000000000012E810 00000000 00000000 0000000D 00000000 80000010 00000000 80000010 00000000 *................................*
MAIN: 000000000012E830 048A82DC 00000000 008E435F 00000000 00000003 00000000 00000000 00000000 *........_C......................*
MAIN: 000000000012E850 0012E8A0 00000000 004168AC 00000000 00000004 00000000 048B51A8 00000000 *.........hA..............Q......*
MAIN: 000000000012E870 0000000E 00000000 000003FD 00000000 00000000 00000000 01803632 01D0C3AA *........................26......*
MAIN: 000000000012E890 00D63C1A 00000000 05FF8400 00000000 03F60B6A 00000000 004DE629 00000000 *.<..............j.......).M.....*
MAIN: 000000000012E8B0 048B519C 00000000 004169B8 00000000 00000000 00000000 0055CE52 00000000 *.Q.......iA.............R.U.....*
MAIN: 000000000012E8D0 00000000 00000000 008EAD89 00000000 000001AB 00000000 00000000 00000000 *................................*
MAIN: 000000000012E8F0 00000001 00000000 06F65420 00000000 0012ECD0 00000000 00000000 00000000 *........ T......................*
MAIN: 000000000012E910 00000000 00000000 0000000D 00000000 041D2EC0 00000000 048777B4 00000000 *.........................w......*
MAIN: The stack data starting at 000000007E6DB1C0 is not accessible.
1 * * * END OF JOB * * *