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

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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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