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Posted By: vindhya Member Level: Diamond Posted Date: 27 Jul 2008
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2007 Jawaharlal Nehru Technological University Aeronautical III B.Tech II Semester Supplementary Examinations, Aug/Sep 2007,AIRCRAFT STRUCTURES-II Question paper
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III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007
AIRCRAFT STRUCTURES-II
(Aeronautical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Derive the Equation for principle moment of inertia for unsymmetrical section about
both axes. If Ix,Iy are M.I. about the centroidal axes and Ixy is product of inertia.
[16]
2. A channel section is subjected to a shear of 20kN. Determine the shear flow at
points B,C,D and plot the shear flow variation throughout the cross-section. Also
calculate the resultant force in each region of the cross-section. Shown in figure 2.
[16]
Figure 2
3. Locate Shear Centre. Assume uniform thickness. Shown in figure 3. [16]
Figure 3
4. Derive the Bredt- Batho formula related to torsion. What are the assumptions
made 5. Thickness uniform locate the Shear Centre for the two compartment box beam t
= 10mm, b = 500mm. Also draw the shear flow variation. Shown in figure 5. [16]
Figure 5
6. The sheet stringer panel 250 x 300 x 1 mm, shown in figure 6. is loaded in com-
pression on the 300 mm side by means of rigid members. The sheet is assumed to
be simply supported at the loaded ends and at the rivet lines and to be free at the
sides. Each stringer has an area of 65mm2. Find total compressive load P for the
following conditions.
(a) When the sheet first buckles.
(b) When the structure stress FC is 7000N/cm2. [16]
Figure 6
7. What are the various functions of structural components? [16]
8. Write short notes on the following:
(a) Types of riveted joints
(b) Rivet failures
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