APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER M-TECH DEGREE EXAMINATION, MAY 2017
Mechanical Engineering

(Machine Design)

01 ME6106 EXPERIMENTAL STRESS ANALYSIS

Max marks : 60 Duration : 3 hours

Answer any mo full questions from each PART

PARTA

1.(೩) Derive the equilibrium equation in terms ofdisplacement. (4)

(b) At a point in a stressed body, the cartesian components of stress
are Jxx-100 MPa_ ‏50۔‎ MP-a, - 30 MPa, = 30 MPa, = -30 MPa,Txz
60 MPa.
Determine the principal stress and direction of maximum principal stress. (5)

2. (a) Describe in detail the principle of working, uses and limitations of an induction strain gauge.
(5)
(b) Mention the steps involved in strain gauge mounting. (4)
3. (2) What is the necessity oftemperature compensation? How this can be achieved? (5) (b) What is a

stress gauge? How a conventional gauge can be used as a stress gauge?

(4)
PART B
4. (a) Discuss the different ways in which a Wheatstone bridge can be balanced. (5)
(b) A three element rectangular rosette stain gauge is mounted on a steel specimen. For a
particular state of loading of the structure, the gauge readings are ea = 200/1 =
900/1 strain, 1000/1 strain. Determine the principal stresses (4)

5. (8) Derive the equation for out-of-balance voltage in fixed current Wheatstone bridge method of
strain measurement. (6)

(b) Discuss any one method for calibrating a strain gauge. (3)

6, (a) Obtain the sensitivity of any two common Wheatstone bridge arrangement with variable input
voltage. (5)

(b) Explain the working principle of a cathode ray tube. (4)