06 September 2007 2000-2200pm Introduction to Msc-patran:

KJ4363 FEM06 SEPTEMBER 20072000-2200pm

INTRODUCTION TO MSC-PATRAN: BEAMS

1. Model the beam problem described in the lecture note Ch. 5 example (pg. 73)

Notice the boundary conditions.

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Distributed load applied at 2nd element

However, the beam cross-section is

(All units in mm)52.2

10

10 120

10

52.2

I = 4 x 106 mm4

E = 200 GPa

Apply the 1D PATRAN modelling experience from Ch. 2 & 4 to model this beam problem into a .db file. However :

o Instead of ROD elements which can only take axial load & displacement, we now use BEAM elements which could additionally take transverse loading & displacement.

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Once the I-beam section have been created, it appears in the selection box and it could be selected as section name

o In addition, for BEAM elements, the beam orientation needs to be defined so that the beam cross section is aligned and orientated accordingly.

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x

z

y

Beam axial length direction

Need to define this local x-y plane of the beam. (i.e to define this plane, input ANY vector G on this plane)

G

Check if orientation and cross section correct :

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Alternatively, instead of using uniformly distributed load option, we could also apply the nodal loads (as shown in figure 5.5 pg. 73 of the example):

(alternative loading approach is created under “loadcase2”)

2. Create a .bdf file for the above .db model With default output requests (i.e. displacments, stress & spcforces) Apply the 1D PATRAN modelling experience from Ch. 2 & 4 to create the .bdf

file

beam. bdf

$ NASTRAN input file created by the MSC MSC.Nastran input file$ translator ( MSC.Patran 2001 r2a ) on September 06, 2007 at 17:34:45.ASSIGN OUTPUT2 = 'beam.op2', UNIT = 12$ Direct Text Input for File Management Section$ Linear Static Analysis, DatabaseSOL 101TIME 600$ Direct Text Input for Executive ControlCENDSEALL = ALL

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SUPER = ALLTITLE = MSC.Nastran job created on 06-Sep-07 at 17:33:46ECHO = NONEMAXLINES = 999999999$ Direct Text Input for Global Case Control DataSUBCASE 1$ Subcase name : Default SUBTITLE=Default SPC = 2 LOAD = 2 DISPLACEMENT(SORT1,REAL)=ALL SPCFORCES(SORT1,REAL)=ALL STRESS(SORT1,REAL,VONMISES,BILIN)=ALLSUBCASE 2$ Subcase name : loadcase2 SUBTITLE=loadcase2 SPC = 2 LOAD = 4 DISPLACEMENT(SORT1,REAL)=ALL SPCFORCES(SORT1,REAL)=ALL STRESS(SORT1,REAL,VONMISES,BILIN)=ALLBEGIN BULKPARAM POST -1PARAM AUTOSPC NOPARAM,NOCOMPS,-1PARAM PRTMAXIM YES$ Direct Text Input for Bulk Data$ Elements and Element Properties for region : beam1PBARL 1 1 I + A+ A 120. 52.2 52.2 10. 10. 10.$ Pset: "beam1" will be imported as: "pbarl.1"CBAR 1 1 1 2 0. 1. 0.CBAR 2 1 2 3 0. 1. 0.$ Referenced Material Records$ Material Record : steel$ Description of Material : Date: 06-Sep-07 Time: 17:12:18MAT1 1 200000. .3$ Nodes of the Entire ModelGRID 1 0. 0. 0.GRID 2 1000. 0. 0.GRID 3 2000. 0. 0.$ Loads for Load Case : DefaultSPCADD 2 4 6LOAD 2 1. 1. 1$ Displacement Constraints of Load Set : clampedSPC1 4 123456 1

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$ Displacement Constraints of Load Set : rollerSPC1 6 2 2 3$ Loads for Load Case : loadcase2LOAD 4 1. 1. 3 1. 5 1. 6 1. 7$ Nodal Forces of Load Set : nodal_forceFORCE 3 2 0 6000. 0. -1. 0.$ Nodal Forces of Load Set : nodal_forceMOMENT 5 2 0 1.+6 0. 0. -1.$ Nodal Forces of Load Set : nodal_force2FORCE 6 3 0 6000. 0. -1. 0.$ Nodal Forces of Load Set : nodal_force2MOMENT 7 3 0 1.+6 0. 0. 1.$ Pressures of Distributed Load Set : loadPLOAD1 1 2 FY FR 0. -12. 1. -12.$ Referenced Coordinate FramesENDDATA 52217fc7

3. Run the .bdf file above using MSC/NASTRAN Double click the MSC NASTRAN icon to invoke MSC/NASTRAN Input/refer the appropriate .bdf filename Click open & run A DOS window shall appear when NASTRAN is running and when the run is

complete, a line message appears in the window

4. Check the resulting files from the MSC/NASTRAN run Access the appropriate directory where these files are saved There should *.op2, *.f06. *.f04 and *.log files (where * is filename similar to

filename of .bdf) The *.f06 file could be opened using a normal text editor Open the *.f06 file and compare the nodal displacements results with that found

in the Ch. 5 lecture notes.

A portion from beam.f06:

1 MSC.NASTRAN JOB CREATED ON 06-SEP-07 AT 17:33:46 SEPTEMBER 6, 2007 MD NASTRAN 2/16/07 PAGE 11 DEFAULT 0 SUBCASE 1 D I S P L A C E M E N T V E C T O R POINT ID. TYPE T1 T2 T3 R1 R2 R3 1 G 0.0 0.0 0.0 0.0 0.0 0.0 2 G 0.0 0.0 0.0 0.0 0.0 -2.758501E-04 3 G 0.0 0.0 0.0 0.0 0.0 4.650297E-041 MSC.NASTRAN JOB CREATED ON 06-SEP-07 AT 17:33:46 SEPTEMBER 6, 2007 MD NASTRAN 2/16/07 PAGE 12 LOADCASE2 0 SUBCASE 2 D I S P L A C E M E N T V E C T O R POINT ID. TYPE T1 T2 T3 R1 R2 R3 1 G 0.0 0.0 0.0 0.0 0.0 0.0 2 G 0.0 0.0 0.0 0.0 0.0 -2.758501E-04

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3 G 0.0 0.0 0.0 0.0 0.0 4.650297E-041 MSC.NASTRAN JOB CREATED ON 06-SEP-07 AT 17:33:46 SEPTEMBER 6, 2007 MD NASTRAN 2/16/07 PAGE 13

5. Post-process the result using MSC/PATRAN

Click the Analysis icon and Action Read Ouput file Click the select result file tab and input/refer the appropriate *.op2 file

Click the translation parameter tab and select rotational nodal result

Apply

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Now, click the Results icon. Notice the default loadcase, which was run, is shown in the result case box.

In the fringe result box, the displacement, stress and spcforces results are available (as requested)

Try out plotting the results

SELAMAT BERUSAHA….

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06 September 2007 2000-2200pm Introduction to Msc-patran:

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