# Instruction on FEM Analysis Using MSC Nastran/Patran. Linear and Buckling Analysis

## Reinforcing Beams on a Fugelage Structure Using very Thin Skin, Fixed at one End

### Seminar Paper, 2014

Excerpt

MasterDiplomaSeminar
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Aim
The aim of this exercise is to perform a Finite Element Analysis using M.Sc. PATRAN/
NASTRAN tool on a hyperboloid structure. The structure is a part of the tail section of PW-6U
glider. Angular straight Beams are created as re-enforcement of the structure. The load is
taken from the manual of the PW-6U glider and a Linear and a Buckling analysis is performed
to see the effect of the beams on the structural strength.
Software Version
M.Sc. Nastran 2012.2
Patran 2011-64 bit.
File required
None
Problem Description
The primary design of a small fuselage section of an aircraft.
Design of re-enforcing beams for the fuselage and the aim is to evaluate the structural
integrity of the entire structure.
The beams are made of Aluminium, E = 69000 M.Pa, Poisson Ratio = 0.33.
The beams are solid rectangular beams with W = 3, H = 7.
The skin of the fuselage is also made of aluminium and having a thickness of 0.5mm.
One end of the fuselage is totally fixed and the other side is under a load of 2379 N
which is horizontal with the axis of the structure. (The load is given in `Y' axis).
The structure should be able to take the load and the beams should be able to perform
properly under buckling while the skin is kept very thin.
2379 N
Fixed end of
the structure
Reenforcing
beams

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Instructions for exercise
1. Create a new database
A
B
C
D
E
F
Create a new database:
A.
File / New...
B.
Enter
criss_cross_reenforc
ement.db as the File
name
C.
Click OK
D.
Select Default
E.
Select Structural
F.
Click OK

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A
B
C
D
E
F
A. Click on Home option.
B. Arrange the Co-ordinate as shown
in the figure at left hand side.
C. Click on Geometry option and
Select: Create/Point/XYZ.
D. Uncheck the Auto execute.
E. Insert [3600 0 0] in Point
Coordinate list.
F. Click Apply.
G. Do the same steps for a Point
Coordinate list of [3800 0 0]

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After all these steps the geometry should look like the below given figure.
Create curve geometry:
A. Click on the Geometry icon
B. Geometry:
Create/Curve/2Dcircle
D. Enter construction plane list
Coord 0.1
E. Uncheck Auto Execute
F. Enter <3600 0 0> as the
Center point list
G. Click Apply
H. Create another curve
following the same steps,
Enter <3800 0 0> as the
Center point list
B
A
C
D
E
F

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Create Point Geometry
A. Click on the Geometry icon
B. Geometry:
Create/Point/Interpolate
C. Option: Curve
D. Enter 10 in Number of Interior
Points
E. Uncheck Auto Execute
F. Select Curve 1 and 2 in the
curve list
G. Click Apply
A
B
C
D
E
F
G

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p.s: We are creating 2 point curve between one point of the first circular curve and second point of the
other circular curve as our aim is to create straight curve in an angle between two circular curves.
Create Curve Geometry
A. Click on the Geometry icon
B. Geometry: Create/Curve/Point
C. Option: 2 point
D. Uncheck Auto Execute
E. Select Point 1 as shown in picture as
starting point list.
F. Select Point 2 as shown in the picture
as ending point list
G. Click Apply
H. Follow the same steps and create a
curve for point 3 and 4.
I. Follow the steps for every points.
1
2
3
4
A
B
C
D
E
F

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After all the above mentioned steps the geometry should look like the following fig:
A. Click on the Preferences
icon.
B. Select the Picking option.
C. Check the Enclosed entire
entity option.
D. Click the Close option.
A
B
C
D

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Note: In this step we will break the circular curves at every point on the curves. That means we will
break that one circular curve in ten small curves.
A. Click on the Geometry icon.
B. Geometry: Edit/Curve/Break.
C. Option: Point.
D. Check the Delete Original curves.
E. Uncheck Auto Execute.
F. In the Curve list select the circular curve as
shown in the figure.
G. In the Break point list option select all the
points on the selected curve similarly how
we selected the curve list.
H. Click Apply.
I. Follow the same steps for the curve at the
other end of the cylinder.
A
B
C
D
E
F
G

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2
1
3
4
A. Click on the Geometry icon
B. Geometry: Create/Surface/Curve
C. Option: 2 Curve.
D. Uncheck Auto Execute.
E. In the starting curve list select the curve
marked as 1 in the figure.
F. In the ending curve list option select the
curve marked as 2 in the figure.
G. Click Apply.
H. Follow the same steps for all the curves.
A
B
C
D
E
F
G
Excerpt out of 34 pages

Details

Title
Instruction on FEM Analysis Using MSC Nastran/Patran. Linear and Buckling Analysis
Subtitle
Reinforcing Beams on a Fugelage Structure Using very Thin Skin, Fixed at one End
College
Warsaw University  (FACULTY OF POWER AND AERONAUTICAL ENGINEERING)
Course
M.Sc AEROSPACE ENGINEERING
5
Author
Year
2014
Pages
34
Catalog Number
V298375
ISBN (eBook)
9783656966234
ISBN (Book)
9783656966241
File size
2666 KB
Language
English
Keywords
MSC NASTRAN/PATRAN, FEM ANALYSIS
Quote paper
SOURAV PAUL (Author), 2014, Instruction on FEM Analysis Using MSC Nastran/Patran. Linear and Buckling Analysis, Munich, GRIN Verlag, https://www.grin.com/document/298375