Maximum Marks which can be obtained: [67]
(1) What is the difference between strength and toughness? [5]
(2) What is the difference between ductility and hardness? [5]
(3) Please draw the following planes and directions
(112), (110), [222] (3)
(121), (001), [011] (3)
(130), [130] (2)
(4) A single crystal is of silver oriented such that a tensile stress of 90MPa is applied along
the [001] direction. Two slip systems are active
a) (101), [-221], CRSS = 20 MPa
b) (121), [0-12], CRSS = 25 MPa
on which slip system can dislocations move and cause plastic deformation? [16]
(5) Please specify which class of materials (metals, ceramics or polymers) would you
choose for the following applications , and why? [10]
a) To replace a tensile load bearing tissue i.e. for low tensile stresses.
b) To support a tissue where the implant is experiencing very high tensile stresses
coming due to bending.
b) To replace a tissue under repeated loading i.e. fatigue loading resulting in high
tensile and compressive stresses
d) To replace a tissue bearing very high compressive loads and transferring relative
motion (friction)
e) To encourage tissue regeneration
(1) What is the difference between strength and toughness? [5]
(2) What is the difference between ductility and hardness? [5]
(3) Please draw the following planes and directions
(112), (110), [222] (3)
(121), (001), [011] (3)
(130), [130] (2)
(4) A single crystal is of silver oriented such that a tensile stress of 90MPa is applied along
the [001] direction. Two slip systems are active
a) (101), [-221], CRSS = 20 MPa
b) (121), [0-12], CRSS = 25 MPa
on which slip system can dislocations move and cause plastic deformation? [16]
(5) Please specify which class of materials (metals, ceramics or polymers) would you
choose for the following applications , and why? [10]
a) To replace a tensile load bearing tissue i.e. for low tensile stresses.
b) To support a tissue where the implant is experiencing very high tensile stresses
coming due to bending.
b) To replace a tissue under repeated loading i.e. fatigue loading resulting in high
tensile and compressive stresses
d) To replace a tissue bearing very high compressive loads and transferring relative
motion (friction)
e) To encourage tissue regeneration
