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Thursday, 17 September 2015

MECHANIACL PROPERTIES AND TESTING QUESTIONS

QUESTIONS

1) Draw a stress-strain curve for a ductile material. In what respect, a similar curve for a brittle material will be different?
2) Explain weldability and machinability of metal
3) What do you understand by the following terms?
(i)Limit of proportionality        (ii) Yield-point        (iii) Ultimate tensile strength.
4) Differentiate between brittle fracture and ductile fracture. How they are caused.
5) Explain the meaning of the following terms :
(i)Stiffness,                                    (ii)Toughness, and                         (iii)Hardness.
6) What are the different non-destructive tests? Explain briefly their fields of application.
7) Differentiate between failure of material due to fatigue and creep?
8 ) What is the effect of stress and temperature on a creep curve?
9) What do you understand by percentage elongation? What does a high percentage elongation value signify?
10) Name three common hardness tests. Describe anyone of them?State advantages and disadvantages?
11) Do all metals have endurance limits? Explain.
12) Explain the role of fatigue failure behaviour of metals?
13) Why are brittle materials used more often in compression than in tension in structural design?

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