GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Name: Plastic Deformation of Metals
Time: 02:30 PM TO 05:00 PM
Enrollment No:
GUJARAT TECHNOLOGICAL UNIVERSITY
Subject Code: 2142106
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BE - SEMESTER-IV(NEW) — EXAMINATION - SUMMER 2019Subject Name: Plastic Deformation of Metals
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 (a) State fundamental differences between theories of : a. Yielding criterion b. Von-Mises criteria | MARKS |
| (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 Explain with neat schematic and derive equation for —Critical resolved shear stress (T CRSS) for Slip phenomena in metallic solids. | |
| Q.3 (a) Write a formula stating relationship between. Shear Modulus (G), Elastic Modulus(E), and Poisson’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 What is Slip system? What is the use of Burger Circuit? | |
| Q.4 (a) What is the role of Grain boundary in Dislocations Motions? | 03 |
| (b) Define the following term: 1.Sessile dislocation 2. Glissile dislocation 3. Kinks 4. Jogs 5. Stacking faults. | 04 |
| (c) Enlist various strengthening mechanisms in metallic alloys. | 07 |
| OR --- Content provided by FirstRanker.com --- Discuss the properties of precipitates in precipitation strengthened alloys | |
| Q.5 (a) Discuss about the different Crystal Imperfection in Solids | 03 |
| (b) Explain “Ductile-Brittle Transition Temperature” (DBTT) curve | 04 |
| (c) Discuss how can we restore the structural properties of cold work hardened material? | 07 |
| OR Derive the Griffith equation for brittle fracture. | |
| Q.6 (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 Date: 09/05/2019 Total Marks: 70 | |
| Q.7 (a) Draw schematic of grain boundary strengthening 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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