Fatigue Life - Material Science and Engineering - Exam, Exams for Material Engineering. Aligarh Muslim University

Material Engineering

Description: Main points of this past exam are: Fatigue Life, Brittle Fracture Modes., Three, Fatigue Failure, Thermoplastic, Thermosetting Polymers., Linear, Branched, Cross-Linked, Network
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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn Examinations 2010
Module Title: Material Science
Module Code: MECH 6025
School: Mechanical & Process Engineering
Programme Title: Bachelor of Engineering (Honours) in Sustainable Energy Year 2
Programme Code: ESENT_8_Y2
External Examiner(s): Dr. Eugene Coyle, Mr. Richard Linger
Internal Examiner(s): Mr. Michael P O’Mahony
Instructions: Answer THREE questions
Duration: 2 Hours
Sitting: Autumn 2010
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the
correct examination paper.
If in doubt please contact an Invigilator.
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Q1.
(a) Explain ductile and Brittle fracture modes. (10 Marks)
(b) Explain the THREE stages of Fatigue Failure. (6 Marks)
(c) What factors affect fatigue life? (8 Marks)
(d) What is CREEP? Using a diagram illustrate the stages of creep failure. (9 Marks)
Q2.
(a) Explain the difference between Thermoplastic and Thermosetting polymers. (3 Marks)
(b) Describe THREE types of Additives use in plastics. (12 Marks)
(c) Using diagrams illustrate THREE of the following polymer molecular structures:
Linear
Branched
Cross-linked
Network (6 Marks)
(d) Briefly describe the THREE functions of the polymer matrix material in composites.
(12 Marks)
Q3
(a) Define the following terms: (6 Marks)
Alloy
Substitutional solid solution
Interstitial Solid Solution
(b) List THREE defects found in crystalline solids and expand on ONE. (7 Marks)
(c) Describe TWO of the following microstructures (8 Marks)
Pearlite
Bainite
Martensite
(d) List FOUR effects of alloying in steels. (12 Marks)
Q4
(a) Briefly describe THREE of the following type of corrosion: (15 Marks)
Uniform Corrosion
Crevice corrosion
Pitting
Stress corrosion Cracking
(b) Explain FIVE factors that affect corrosion of metals. (10 Marks)
(c) Describe TWO ways to prevent corrosion of steel. (8 Marks)
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