Hall Ticket No Question Paper Code: AAE002
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech III Semester End Examinations (Supplementary) January/February, 2018
Regulation: IARE R16
THEORY OF STRUCTURES
(Aeronautical Engineering)
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Define stress and strain? Derive the relation between elastic constant, and V.
A composite rod is 1000 mm long, its two ends are 40 mm2 and 30 mm2 in area and length are
300 mm and 200 mm respectively. The middle portion of the rod is 20 mm2 in area and 500 mm
long. If the rod is subjected to an axial tensile load of 1000 find its total elongation.
200 GPa
Figure 1
2. Define torsional rigidity? In a tensile test, a test piece 25mm in diameter, 200 mm gauge length
stretched 0.0975 mm under a pull of 50 kN. Then, the same rod is twisted 0.025 radians over a
length of 200 mm, when a torque of 400Nm was applied. Find modulus of rigidity?
A cantilever beam 1.5 m long is loaded with UDL of 2 kN/m over a length of 1.25 m from free
end. It also carries point load of 3 kN at a distance of 0.25 m from free end. Draw SFD and
BMD for the cantilever beam.
UNIT II
3. Write short notes on section modulus? Derive section modulus for hollow rectangular section
solid rectangular section?
A rolled steel joist of I-section has the dimensions as shown in figure 2. This beam of I-section
carries UDL of 40 kN/m over a span of 10 calculate the maximum stress produced due to
bending.
Page 1 of 3
Figure 2
4. Show that for a circular cross section, the maximum shear stress is equal to 4/3 times the average
shear stress.
An I-section beam 350 mm x 150 mm has web thickness of 10 mm and flange thickness of 20
mm. If shear force acting on the section is 40 kN, find the maximum shear stress developed in
the section.
UNIT III
5. Derive maximum deflection of a simply supported beam with point load at center using conjugate
beam method.
A cantilever beam of length 2m carries a UDL of 2.5 kN/m for length of 1.25 m from fixed end
and a point load 1 kN at free end. Find deflection at free end, if the section is solid rectangular
with 12 cm wide and 24 cm deep. Take E 10 GPa.
6. Derive the expression for crippling load when one end of the column is fixed and the other end
is free.
Write the limitations of Euler's formula and explain with an example of mild steel column.
UNIT IV
7. Briefly explain about moment area method and differentiate between frames and trusses.
Determine the forces in all the members of a cantilever truss shown in figure 3.
Figure 3
Page 2 of 3
8. What is a Frame? State the difference between perfect frame and an imperfect frame.
Explain Clapeyron's method for statically indeterminate structures.
UNIT V
9. Define the terms Principal planes, Principal stress and angle of obliquity.
Write a note on Mohr's circle of stresses and write its applications.
10. The tensile stresses at a point across two mutually perpendicular planes are 120 MPa and 60
MPa. Determine normal, tangential and resultant stresses on plane inclined at 30 to the axis of
minor stress.
A point in a strained material is subjected to stresses shown in figure 4. Using Mohr's circle
method, determine normal and tangential stresses across oblique plane.