TOM IMP & Assignment Q Unit-2.pdf
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The document outlines an assignment for a mechanical engineering course with various questions related to material testing, including hardness testing methods, tensile and creep testing procedures, and fatigue characteristics. It includes both theoretical questions and practical procedures, emphasizing the differences between testing methods and the significance of specific material properties. The questions cover concepts from endurance limits to ductile-brittle transition temperatures.
TOM IMP & Assignment Q Unit-2.pdf
- 1. DEPARTMENT OF MECHANICAL ENGINEERING OML 751 – TESTING OF MATERIALS UNIT – II : Mechanical Testing ASSIGNMENT-II QUESTIONS _____________________________________________________________________ YEAR: IV SEMESTER: VII Answer ALL Questions PART - A 1. What is the significant difference between Rockwell hardness testing and Vicker's hardness testing? (Nov/Dec’2021) 2. Which hardness testing method can be used for measuring the hardness of aluminium alloys and high strength steels? (Apr/May’2023) 3. What is the principle of hardness testing? (Nov/Dec’2020) 4. Why the tensile samples are dog-bone shaped? (Nov/Dec’2021) 5. Define Endurance limit. (Nov/Dec’2020) 6. Define strain hardening and proof stress. 7. State the difference between Endurance limit & Fatigue strength. (Apr/May’2023) 8. What kind of indenter suitable for Vickers hardness? 9. What is modulus of rupture in bending nature? 10. What is role of SN curve in fatigue mechanism? PART – B & C 1. Explain the procedure for tensile testing. Using a typical stress-strain curve, discuss the various properties that can be determined from the test. (Nov/Dec’2020 & Apr/May’2023) 2. Explain the procedure for creep testing of materials. Explain with a neat sketch the different stages in creep curve and the mechanism in each stage. (Nov/Dec’2020 & Nov/Dec’2021 & Apr/May’2023) 3. What are major contrasts of nature between Rockwell, Brinell and Vickers hardness tester. (Nov/Dec’2020) 4. Explain the procedure and standard specimen dimensions used for impact testing of materials, and what are major contrasts of nature between Izod and Charpy test. (Nov/Dec’2020) 5. Briefly explain Fatigue test. Draw S-N diagram (schematic) for mild steel and for aluminium, explain how S-N diagram is plotted. (Nov/Dec’2021) 6. How Ductile to Brittle Transition Temperature (DBTT) is determined from toughness versus temperature plot and explain the factors affecting DBTT. (Nov/Dec’2021)