Department of Mechanical Engineering
Mechanics of Materials I 2011
MECHENG 242 FC
LECTURERS: A/Prof Simon Bickerton (SB, Course Coordinator) – Room 1.903
Dr. Richard Lin (RL) – Room 1.704
Dr. Xiaowen Yuan (XY) – Room 1.703
LECTURES: Wednesday 3.00- 4.00
Thursday, Friday 1.00- 2.00
CLINIC: Friday 4.00- 5.00
LABORATORIES: Tuesday 9.00-11.00, 3.00-5.00 Eng3.319
Note: A laboratory schedule will be finalised in the first two weeks of class.
OBJECTIVE:
The purpose of the course is to provide a foundation to the principles involved in the design of load carrying devices where the design criterion is either yielding or stiffness. Complex combined (axial, bending, shear, torsion) loading situations are addressed.
COURSE OUTLINE:
Fundamentals
· Introductory Concepts (Sec 1.0, SB) – Mechanics of single and multiple body devices. Internal loads and moments, stress and strain due to normal and shear forces.
· Elastic Deformation, Single Stress States (Sec 2.0, SB) - Material properties from a tensile test: modulus of elasticity, Poisson’s ratio, shear modulus, and yield stress. Concepts of material failure.
· Elastic Deformation, Multiple Stress States (Sec 9.0, XY) – General Hookes Law. Analysis of 2D stress states, and failure under these conditions.
Applications
· Axial Loading of Bars (Sec 3.0, SB) Determination of normal stress and strain under axial loading. Statically determinate and indeterminate problems.
· Bending of Beams (Sec 4.0, SB) Normal stress in beams due to pure bending. Beam deflection analyses. Buckling of simple struts.
· Simple Shear (Sec 5.0, RL) Determination of shear stress due to simple loading.
· Shear in Beams (Sec 6.0, RL) Analysis of shear stresses in bars and beams carrying transverse forces.
· Torsion of Circular Shafts (Sec 7.0, RL) Shear stress and deformation in shafts under torsion. Basic assumptions of the shaft action under elastic deformations.
· Thin Walled Pressure Vessels (Sec 8.0, XY) Determination of biaxial stress states due to internal pressure.
· Analysis of Multiple Loading Situations (Sec 10.0, XY) Consideration of multiple stress states arising from combined loading. Material failure under complex loading.
ASSESSMENT:
Lab journals (two at 5% each) 10%
Tests (three at 10% each) 29%
Online course survey incentive 1%
Final exam 60%
Note: 1% will be provided to all students that complete the Faculty of Engineering online survey towards the end of the semester.
ASSESSMENT TIMETABLE:
Lab journals (1 and 2) -Due at the end of the laboratory session.
-Submit to the tutor in charge of the lab.
Test 1 (Week 4) 4:00-5:00, Friday, 25 March
Test 2 (Week 7) 4:00-5:00, Friday, 29 April
Test 3 (Week 11) 4:00-5:00, Friday, 27 May
-The above test dates are provisional, and will be confirmed by the end of week 2.
-Tests will usually be held during the clinic time slot.
LABORATORIES:
(i) Determination of the Young’s modulus and Poisson’s ratio of metals.
(ii) Use of photoelasticity to study stress concentrations and bending of beams.
FINAL EXAM:
The final exam will contain SIX questions and students will be instructed to attempt ANY FIVE of the six questions. The exam will be closed book, using restricted calculators.
Length: 3 hours.
* Only the first FIVE questions that you answer will be marked.
TUTOR
A tutor will be made available to you at his office, on Wednesdays from 10am to noon, and Mondays and Thursdays from 4pm to 5pm. Mr Nazrul Islam is your tutor, available in room 4.609.
PRESCRIBED TEXT BOOK:
-Mechanics of Materials – R. C. Hibbeler, SI Version, 7th Edition
RECOMMENDED BOOKS:
-Engineering Mechanics, Statics – J. L. Meriam and L. G. Kraige, 6th Edition
-Mechanics of Engineering Materials-Benham, Crawford & Armstrong - 2nd edition
-Mechanics of Materials–F. P. Beer and E. R. Johnston, jr.
-Structures (or why things don’t fall down) - J. E. Gordon
-The new science of strong materials (or why you don’t fall through the floor) - J. E. Gordon
-Science of structures and materials - J. E. Gordon
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MECHENG 242 – Mechanics of Materials – 2011