aplicación de elementos finitos - ne nastran

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 ..


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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



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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.



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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



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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.



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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.



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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.



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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.



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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.



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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.



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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.



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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.



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1.:. 6un the &nalysis

From the FEM! menu bar select File the choose &naly.e.



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aplicación de elementos finitos - ne nastran

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