Question 12 pts Which of the following is NOT a reason to conduct the Charpy Imp

Question

Question 12 pts

Which of the following is NOT a reason to conduct the Charpy Impact test?

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Question 22 pts

Which of the following is NOT a reason for the notch in the Charpy specimen?

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Question 32 pts

All materials exhibit a temperature sensitivity (change in impact energy with temperature).

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Question 42 pts

In order to ensure a ductile failure, most steels should be used ABOVE the transition temperature.

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Question 52 pts

Specimens with higher impact energies will have a higher percentage of their failure surface showing brittle fracture.

Explanation / Answer

12. Charpy test is used to determine the energy absorbed by the material. This energy measures the material toughness and acts as a tool for studying temperature variation. So charpy test is not used top find the resistance to failure.

22. Notch in the charpy test is not the reason for concentrating the stresses at the notch. It is for allowing the fracture and constant failure and hammer hits the sample exactly at the notch.

32. True, All materials will exhibits temperature sensitivity. Impact energy will definitely with respect to change in temperature.

42. True, most steels are used above the transition temperatures for having ductile failure. If it is less than the transition temperatures then the brittle failure will occur.

52. False, reduction in impact energy only causes the surface brittle failure

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