8/18/2019 Aplicación de Elementos Finitos - NE Nastran
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In the Locate – Enter First Corner of Surface dialog box )erify that the
X" Y" and Z fields contain ,eros. hoose ! .
nother dialog box will appear re(uesting the second corner of the surface.
Enter the following coordinates for the second corner 2
Locate – Enter Second Corner of Surface
3 4 1# Y 4 # 5 4 # Then" clic
! .
enter 2For the third and fourth corners 2
Locate – Enter "hird Corner of Surface #
3 4 1# Y 4 $ 5 4 # Then" clic
! .
enter 2Locate – Enter Fourth
Corner of Surface #
3 4 # Y 4 $ 5 4 # Then" clic
! .
enter 2
The surface you ha)e drawn will appear off to the right side of your
wor%space. ince you will not draw any other surfaces" clic% Cancel in theLocate – Enter First Corner of Surface dialog box.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
8/18/2019 Aplicación de Elementos Finitos - NE Nastran
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To center the image of the surface in your wor%space" select $ie% on the
FEM! menu bar" then from the drop down menus" choose &utoscale and
then $isi'le. You should ha)e a surface in the wor%space that loo%s li%e
this 2
The rectangles that appears in the surface are not the elements. The
elements will be defined in a later section.
1.$.$. (efine Material Pro)erties
6ere" you will define the physical properties of the material that composes
the model.
From the FEM! menu bar select Model then choose Material.
+n the (efine Isotro)ic Material dialog box enter the following )alues into
their respecti)e fields 2
+0 1
Title luminium
Youngs Modulus" E 1e7
!oisson8s 9atio nu #.:
Mass 0ensity #.1
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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elect ! . The (efine Isotro)ic Material dialog box will appear againexpecting you to enter another material. ince there is only one material in
this model" choose Cancel to exit the next material definition.
1.$.:. (efine the Pro)erties of the Elements
+n this step" you will define the properties of the shell elements that will be
used in the next step to mesh the model.
From the FEM! menu bar select Model then choose Pro)erty.
+n the (efine Pro)erty – PL&"E Element "y)e dialog box clic% the
Elem*Pro)erty "y)e button.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
8/18/2019 Aplicación de Elementos Finitos - NE Nastran
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The Element * Pro)erty "y)e dialog box appears. elect Plate and )erify
that all other settings are the same as illustrated.
This last step will instruct NE/Nastran to use ;shell? elements with four nodes @grid pointsA" one in each corner.
elect ! . in the (efine Pro)erty – PL&"E Element "y)e dialog box" fill
the following )alues into their respecti)e fields 2
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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+0 1
Title luminium !late
Thic%ness" Ta)g or T1 #.1
lic% the down arrow in the Material box and select +,,&luminum.
elect ! . The (efine Pro)erty – PL&"E Element "y)e dialog box will
re*appear. lic% Cancel because there are no further element types todefine.
1.$.=. Mesh the Model
+n the first part of this step" you will di)ide the model into ten elements
along its long axis and four elements along its short axis. The thic%ness of
the plate re(uieres only one element when using shell elements.
From the FEM! menu bar select Mesh then choose Mesh Control and
Si.e &lon/ Cur0e.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
8/18/2019 Aplicación de Elementos Finitos - NE Nastran
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The Entity Selection – Select Cur0e1s2 to Set Mesh Si.e dialog boxappears. Bith your mouse" point the top edge of the surface in the
wor%space and left clic% @see figure belowA. 0o the same with the botton
edge.
Select ! . The Mesh Si.e &lon/ Cur0es dialog box appears. +n the
Mesh Si.e box enter 1# for the 3um'er of Elements. The Mesh Si.e
&lon/ Cur0es dialog box should appear as illustrated.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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elect ! . "he Entity Selecttion – Select Cur0e1s2 to Set Mesh Si.e
dialog box appears again. Now" select the left edge and clic% @see figure
belowA. Then" select the right edge and clic%.
lic% ! . +n the Mesh Si.e &lon/ Cur0es dialog box" enter = for the
3um'er of Elements.
elect ! in the Mesh Si.e &lon/ Cur0es dialog box. elect Cancel in
the Entity Selection – Select Cur0e1s2 to Set Mesh Si.e dialog box.
From the FEM! menu bar select Mesh then choose Geometry and
Surface.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
8/18/2019 Aplicación de Elementos Finitos - NE Nastran
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The Entity Selection – Select Surfaces to Mesh dialog box appears.
Bith your mouse" point to and left clic% the surface of the model @point
anywhere in the rectangleA. elect ! in the Entity Selection – Select
Surfaces to Mesh dialog box.
The &utomesh Surfaces dialog box appears. lic% the down arrow in the
Pro)erty box and select +,&luminum Plate.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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elect ! . Your model should now loo% li%e this 2
1.$.C. &))ly the Constraints
The left side of the aluminum plate is firmly supported. +n this step" you
will create that constraint.
From the FEM! menu bar select Model" then choose Constraint and n
Cur0e.
The Create or &cti0ate Constraint Set dialog box appears. +n the "itlefield type 2 Fi4ed Ed/e.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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elect ! . The Entity Selection – Enter Cur0e1s2 to Select dialog box
appears. Bith your mouse" point to and clic% the left side edge of the
model.
elect ! . The Create Constraints on Geometry dialog box opens.
+n the entries are the same as in this illustration" select ! . Bhen the
Entity Selection – Enter Cur0e1s2 to Select dialog box opens" select
Cancel. The constraint has now been applied. Your model should now
appear li%e this 2
The small triangles with the letter >F? below them signify that the edge is
fixed.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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1.$.'. &))ly the Load
The load is the '# pound upward force applied to the right side of the
aluminum plate. This step shows you how to enter that load.
From the FEM! menu bar select Model then choose Load and n Cur0e.
Enter 5, Pounds in the "itle field of the Create or &cti0ate Load Set
dialog box.
elect ! . The Entity Selection – Enter Cur0e1s2 to Select dialog box
appears. Bith your mouse point to and clic on the right side edge of the
model.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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elect ! . Bhen the Create Loads on Cur0es dialog box opens" select
Force and enter the )alue of '# in the FY box. @Note that the force is
positi)e since it is acting in the positi)e Y direction.A
elect ! . The Entity Selection – Enter Cur0e1s2 to Select dialog boxappears again. elect Cancel. The load is now applied. Your model should
now appear li%e this 2
Now the two load arrows on the right edge.
To sa)e your file select File from the FEM! menu bar and then choose
Sa0e &s. Enter a file name @Example !roblem 1A and clic% Sa0e.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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1.:. 6un the &nalysis
From the FEM! menu bar select File the choose &naly.e.
NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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NE/Nastran Material de uso estrictamente did-ctico" +ng. Manuel hanam. !es(uera 0iamante ..
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