PTU B.Tech Aerospace Engineering 4th Semester May 2019 60514 AIRCRAFT STRUCTURES I Question Papers

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Total No. of Questions : 09

Total No. of Pages : 03

B.Tech.(ANE) (Sem.-4)

AIRCRAFT STRUCTURES – I

Subject Code : ANE-206

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M.Code: 60514

Time: 3 Hrs.

Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.

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2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Write briefly :
   1. Derive the relations between stress and strain in a plane stress problem.
   2. State the principle of superposition

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   3. What is Prandtl stress function solution?
   4. Derive an expression for the strain energy of a bar subjected to uniaxial tensile force.
   5. What is Shear lag?
   6. What is meant by a doubly redundant structure?
   7. State the different types of loads acting on aircraft structural components.

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   8. Write down an expression for the shear flow in an open section beam subjected to shear forces Sx and Sy.
   9. Explain the term : ‘Margin of Safety'
   10. What are principal planes and principal stresses?

SECTION-B

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2. A point in a strained material is subjected to a tensile stress of 120 N/mm² and a compressive stress of 80 N/mm² acting at right angles to each other. Find the normal stress, tangential stress and the resultant stress on a plane inclined at an angle of 30° with the compressive stress.
3. A circular section bar of radius R is subjected to equal and opposite torque T at each of its free ends. Determine ; (a) rate of twist and (b) stress distribution.
4. Calculate the rotation of point 1 of the contilever beam in Fig. 1. Using the principle of complementary virtual work. Neglect shear deflection.
   y

   2

   3EI3

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   EI3

   1

   -

   X

   L

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   L

   Fig. 1

5. Sketch a typical V-H diagram and briefly explain (a) stall regions (b) method of plotting various segments of the diagram (c) Red-line speed of the air plane and (d) Significance of maneuver point and corner velocity.
6. Describe the different types of fitting failures with the help of suitable sketches.

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SECTION-C

7. A cantilever of length L and depth 2h is in a state of plane stress. The cantilever is of unit thickness, is rigidily supported at the end x = L and is loaded as shown in fig. 2. Show that the stress function :
   $ = A x² + B x²y W + cy³ = D (5x2 y 3 - y³)$ is valid for the beam and evaluate the constants A, B, C and D in terms of q and h.
   

   This download link is referred from the post: PTU B.Tech 2nd Semester Last 10 Years 2009-2019 Previous Question Papers|| Punjab Technical University

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