The ratio of strain energy of edge dislocation to screw dislocation is equal to ___________

Where v is poison’s ratio, and b is the Burger’s vector.

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1.	Two opposite sign dislocations are separated by 100 nm in iron with grain size 4 mm. Determine the attractive force and total force on the two dislocations? Shear modulus of iron is 80 GPa, and the lattice parameter is 2.86 Ao
A.	312.5910-3 N/m, 1.2510-9 N
B.	112.5910-3 N/m, 8.2510-9 N
C.	312.5910-9 N/m, 1.2510-3 N
D.	312.59 N/m, 1.25 N
Answer» B. 112.5910-3 N/m, 8.2510-9 N

Discussion

2.	Two edge dislocations of the same sign and same burger’s vector lie on above the same slip plane. If the energy of each dislocation is Q, what will be the difference in the total energy of two dislocations, when they are separated and when they are combined?
A.	0
B.	Q
C.	2Q
D.	4Q
Answer» D. 4Q

Discussion

3.	Shear stress required to bend a dislocation of radius R and burger vector b is P. What will be shear stress needed to turn a dislocation of radius 2R and burger’s vector 2b to bend the dislocation?
A.	P
B.	2P
C.	4P
D.	16P
Answer» B. 2P

Discussion

4.	The following diagram shows a positive edge dislocation. The AA’ shows the slip plane for the dislocation. Above the slip plane stress is _________ in nature, and below the slip plane stress is _______ in nature.
A.	compressive, tensile
B.	tensile, compressive
C.	tensile, pure shear
D.	compressive, pure shear
Answer» B. tensile, compressive

Discussion

5.	For a dislocation with burger’s vector equal to b, the strain energy per unit length is X. What will be the strain energy with burger’s vector is equal to 3b?
A.	X
B.	3X
C.	9X
D.	√3X
Answer» D. √3X

Discussion

6.	The ratio of strain energy of edge dislocation to screw dislocation is equal to ___________
A.	Where v is poison’s ratio, and b is the Burger’s vector.
B.	1/(1-v)
C.	v
D.	vb
E.	b
Answer» B. 1/(1-v)

Discussion

Explore topic-wise MCQs in Mechanical Metallurgy Questions and Answers.

Two opposite sign dislocations are separated by 100 nm in iron with grain size 4 mm. Determine the attractive force and total force on the two dislocations? Shear modulus of iron is 80 GPa, and the lattice parameter is 2.86 Ao

Two edge dislocations of the same sign and same burger’s vector lie on above the same slip plane. If the energy of each dislocation is Q, what will be the difference in the total energy of two dislocations, when they are separated and when they are combined?

Shear stress required to bend a dislocation of radius R and burger vector b is P. What will be shear stress needed to turn a dislocation of radius 2R and burger’s vector 2b to bend the dislocation?

The following diagram shows a positive edge dislocation. The AA’ shows the slip plane for the dislocation. Above the slip plane stress is _________ in nature, and below the slip plane stress is _______ in nature.

For a dislocation with burger’s vector equal to b, the strain energy per unit length is X. What will be the strain energy with burger’s vector is equal to 3b?

The ratio of strain energy of edge dislocation to screw dislocation is equal to ___________

The following diagram shows a positive edge dislocation. The AA’ shows the slip plane for the dislocation. Above the slip plane stress is ___ in nature, and below the slip plane stress is _ in nature.