STUPIDSID
1(a)
What are the factors that should be considered while selecting a strain gage? What type of gauges you would recommend for high temperature strain measurements? How would you compensate for tempreature changes?
10 M
1(b)
What do you understand by a strain rosette? List the different types of strain rosette configuration currently in use. Discuss their used and limitations.
10 M
2(a)
Define 'Gauge factor'. Derive an expression to determine the same for an electrical resistance strain gage.
10 M
2(b)
Three strain gauges are applied to an area at a point in such a manner that gauge 'B' makes a positive angle of 30° with gauge 'A' and gauge 'C' makes a positive angle of 45° with gauge 'B' The strain readings obtained from the gauges are as follows:
Calculate the principal strains, principal stresses and principal directions. Take E = 200GPa and Poisson ration μ = 0.3 for the gauge material.
| Gauge | A | B | C |
| Strain(μ stain) | -600 | 300 | 400 |
10 M
3(a)
Derive the stress optic law, as applied to two-dimesional photo elasticity.
10 M
3(b)
Explain the calibration technique used for photoelastic circular disc under diametral compression.
10 M
4(a)
Explain the shear diffference method for the separation of principal stresses.
10 M
4(b)
What are the properties of an ideal photoelastic material? Discuss a few important photoelastic materials.
10 M
5(a)
Explain stress freezing method procedure with a neat sktech.
10 M
5(b)
Describe briefly the scattered light method of photoelastic stress analysis. Specify the advantages and limitations of this method.
10 M
6(a)
What are photoealstic coatings? What are their applications, advantages and limitations?
10 M
6(b)
What are strip coatings? How can they be used to separate the principal stresses?
10 M
7(a)
What is Brittle coating technique? How it is useful for stress analysis?
4 M
7(b)
Discuss the crack patterns which can be obtained in a brittle coating under various combinations of stresses. Illustrate your answer by giving sketches.
8 M
7(c)
Describe the calibration method generally used for brittle coatings. How true threshold strains can be determined by this method?
8 M
8(a)
Explain briefly the phenomenon of Moire techniques used for the analysis of stresses.
10 M
8(b)
Discuss briefly the applications and advantages of the Moire's method of stress analysis. Also list the limitations.
10 M
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