Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142106 Plastic Deformation Of Metals Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142106 Date:09/05/2019
Subject Name: Plastic Deformation of Metals
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) State fundamental differences between theories of : a. Yielding criterion b.
Von-Mises criteria
03
(b) What is Slip System? Explain why FCC metal is usually more ductile than
BCC & HCP Metals?
04
(c) Define the Terms: (i) Young?s Modulus (ii) Shear Modulus (iii) True Stress
& True strain (iv) Engineering Stress and Engineering Strain v) Ultimate
tensile stress vi) Proof stress vii) braking strength.
07
Q.2 (a) What is ?Dislocation loop?? Explain Multiplication of dislocation ?Frank ?
Reed Source?.
03
(b) Discuss the various techniques of observation of dislocation. 04
(c) Differentiate between plastic deformation by slip and twinning. 07
OR
(c) Explain with neat schematic and derive equation for ?Critical resolved shear
stress (? CRSS) for Slip phenomena in metallic solids.
07
Q.3 (a) Write a formula stating relationship between Shear Modulus (G), Elestic
Modulus(E), and Possion?s ratio of materials
03
(b) What is Hall-Petch Equation? Explain giving suitable example 04
(c) Define Dislocation? Differentiate Edge and Screw dislocation with neat
sketch.
07
OR
Q.3 (a) What is Slip system? What is the use of Burger Circuit? 03
(b) What is the role of Grain boundary in Dislocations Motions? 04
(c) Define the following term: 1.Sessile dislocation 2. Glissile dislocation 3.
Kinks 4. Jogs 5. Staking faults.
07
Q.4 (a) Enlist various strengthening mechanisms in metallic alloys. 03
(b) Discuss the properties of precipitates in precipitation strengthened alloys 04
(c) Discuss about the different Crystal Imperfection in Solids 07
OR
Q.4 (a) Explain ?Ductile-Brittle Transition Temperature? (DBTT) curve 03
(b) Discuss how can we restore the structural properties of cold work hardened
material?
04
(c) Derive the Griffith equation for brittle fracture. 07
Q.5 (a) Draw schematic of grain boundary strengthening effect. 03
(b) State the fundamental principles governing the strengthening mechanism in
metals and alloys with example
04
(c) Discuss the conditions necessary for the formation of solid solutions in
metallic alloys.
07
OR
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142106 Date:09/05/2019
Subject Name: Plastic Deformation of Metals
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) State fundamental differences between theories of : a. Yielding criterion b.
Von-Mises criteria
03
(b) What is Slip System? Explain why FCC metal is usually more ductile than
BCC & HCP Metals?
04
(c) Define the Terms: (i) Young?s Modulus (ii) Shear Modulus (iii) True Stress
& True strain (iv) Engineering Stress and Engineering Strain v) Ultimate
tensile stress vi) Proof stress vii) braking strength.
07
Q.2 (a) What is ?Dislocation loop?? Explain Multiplication of dislocation ?Frank ?
Reed Source?.
03
(b) Discuss the various techniques of observation of dislocation. 04
(c) Differentiate between plastic deformation by slip and twinning. 07
OR
(c) Explain with neat schematic and derive equation for ?Critical resolved shear
stress (? CRSS) for Slip phenomena in metallic solids.
07
Q.3 (a) Write a formula stating relationship between Shear Modulus (G), Elestic
Modulus(E), and Possion?s ratio of materials
03
(b) What is Hall-Petch Equation? Explain giving suitable example 04
(c) Define Dislocation? Differentiate Edge and Screw dislocation with neat
sketch.
07
OR
Q.3 (a) What is Slip system? What is the use of Burger Circuit? 03
(b) What is the role of Grain boundary in Dislocations Motions? 04
(c) Define the following term: 1.Sessile dislocation 2. Glissile dislocation 3.
Kinks 4. Jogs 5. Staking faults.
07
Q.4 (a) Enlist various strengthening mechanisms in metallic alloys. 03
(b) Discuss the properties of precipitates in precipitation strengthened alloys 04
(c) Discuss about the different Crystal Imperfection in Solids 07
OR
Q.4 (a) Explain ?Ductile-Brittle Transition Temperature? (DBTT) curve 03
(b) Discuss how can we restore the structural properties of cold work hardened
material?
04
(c) Derive the Griffith equation for brittle fracture. 07
Q.5 (a) Draw schematic of grain boundary strengthening effect. 03
(b) State the fundamental principles governing the strengthening mechanism in
metals and alloys with example
04
(c) Discuss the conditions necessary for the formation of solid solutions in
metallic alloys.
07
OR
2
Q.5 (a) Define Strain Hardening effect. State the effect of it on the mechanical
properties of steels?
03
(b) Explain Creep curve and various stages of creep in brief.
04
(c) Draw and label typical schematic of Fatigue Fracture? Explain ?Fatigue
Test with the Help of S-N Diagram.
07
*************
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This post was last modified on 20 February 2020