MENG 222 STRENGTH OF MATERIALS
Department:
Mechanichal Engineering
Program Name:
Course Number:
MENG 222
Mechanichal Engineering
Credits:
4 Cr
Program Code: 23
Year/Semester:
2012-2013 Spring
Required Course
Elective Course
(click on and check the appropriate box)
Prerequisite(s):
CIVL 211
Catalog Description:
Review of Statics. Stress and strain, and Hooke’s law. Constitutive relations. Analysis of stress and strain. Axially
loaded members. Torsion. Stress in beams. Combined stress. Deflection of members. Design of beams and shafts.
Columns.
Course Web Page:
Textbook(s):
Mechanics of Materials by Beer and Johnston, McGraw-Hill,
Lab Manual:
Indicative Basic Reading List :
1. Mechanics of Materials by A.Bedford and K.M Liechti, Prentice Hall,
2. Mechanics of Materials by A.C. Ugural, McGraw-Hill,
3. R.C.Hibbeler, Mechanics of Materials Seventh Edition, Prentice Hall
4. Mechanics of Materials by E.P.Popov, Prentice Hall
Topics Covered and Class Schedule:
Chapter 1
Concept of Stress ( 4 hours)
Chapter 2
Axial Loading (6 Hours)
Chapter 3
Torsion ( 8 Hours)
Chapter 4
Pure Bending ( 8 Hours)
Chapter 5
Analysis and Design of Beams For Bending ( 8 Hours)
Chapter 6
Shearing Stress in Beams and Thin-walled Members ( 8 Hours)
Chapter 7
Transformation of Stress and Strain ( 8 Hours)
Chapter 8
Principal Stress Under a Given Loading ( 8 Hours )
Chapter 9
Deflection of Beams ( 8 Hours )
Laboratory Schedule:
1
Torsion Test
2
Bending Test
3
Thin Walled Cylinder
4
Thick Walled Cylinder
Course Learning Outcomes:
At the end of the course, student must be able to
(1) Review the important principles of statics and determine the internal resultant loadings in a body. Using the
concept of normal stress and shear stress for specific applications to analyse or design of members
subjected to an axial load or direct shear loads.
(2) Define the deformation of the body using the concept of normal and shear strain.
(3) Show the stress strain relations from various experimental methods for materials commonly used in
engineering
(4) Find the stress an deformations in an axially loaded and thermally loaded members using the equilibrium
equations and the compatibility equations for the statically indeterminate cases.
(5) Find the shear stress an angle of twist of a shaft or tube subjected to torsional loading using the equilibrium
equations and the compatibility equations for the statically indeterminate cases..
(6) Draw the shear force and bending moment diagrams and calculating bending stress of the beams made of
homogeneous and composite materials that behaves a linear elastic manner.
(7) Develop a method for finding the shear stress in a beam having a prismatic cross section made from
homogeneous material that behaves in a linear-elastic manner.
(8) Finding the stresses for thin walled pressure vessels and for members loaded in axial, torsional, bending and
shear acting simultaneously on a member’s cross-section.
(9) Express the plane-stress transformation from one coordinate system into components with a coordinate
system having a different orientation. The principal stresses and the maximum in plane shear stress using the
Mohr’s circle method.
(10) Express the plane-strain transformation from one coordinate system into components with a coordinate
system having a different orientation. The principal strains and the maximum in plane shear strain using the
Mohr’s circle method.
(11) Design a beam and shaft to resist both to bending and shear loads.
(12) Determine the deflection and slope of beams and shats using the integration method and the method of
superposition.
(13) Determine the axial load needed to buckle an ideal column.
(14) Determine the buckling of columns subjected to an axial compressive load.
Method
No
Percentage
Midterm Exam
1
30%
Lab. And Quiz
Min 2
20 %
Assessment
Homework(s)
Min 5
10 %
Final Examination
1
40%
Credit Hours for:
Mathematics & Basic Science :1
Engineering Sciences and Design : 3
General Education : 0
Relationship of Course to Program Outcomes
The course has been designed to contribute to the following program outcomes:
(a) apply knowledge of mathematics, science, and engineering
(b) design and conduct experiments, as well as analyze and interpret data.
(e) identify, formulate, and solve engineering problems
(k) use the techniques, skills, and modern engineering tools necessary for engineering practice
Grading System
GRADE
A
AB+
B
BC+
C
CD+
D
DF
NG
I
W
PERCENTAGE
85-100
80-84
75-79
70-74
66-69
63-65
60-62
57-59
54-56
50-53
45-49
0-44
NO GRADE
INCOMPLETE
WITHDRAWN
GPA
4.0
3.7
3.3
3.0
2.7
2.3
2.0
1.7
1.3
1.0
0.7
0.0
Course Policies
a) Attendance
Students are expected to attend lectures, tutorials and/or practical sessions regularly throughout the semester.
Students are expected to be punctual for class, enter classroom before the lecturer. Late comers will not be accepted in
the class for that period if he/she is late 5 minutes after the lecture starts. However, if a student is absent, he/she must
present an official written document stating the reason for being absent.
b) Cheating
Cheating is a serious offence. The minimum penalty for students who are caught cheating in a quiz or an exam is a
score of zero in the relevant assignment or exam and send to the university disciplinary committee.
c) Plagiarism
Copying of any parts of the lab reports of other students is not allowed and, if found out, will result in an
automatic zero for that report for both copier and copyee. Partners can discuss the experiment and results between
themselves, but must each represent their own report.
d) Handing in the Homeworks
All home work must be presented on a-4 size white-plain papers. The first page will be the ‘title page’, which will include: code
and name of the course, assignment number (such as homework no.2 etc.), student number & name (e.g. Submitted by # 981234
Ali Berk Tansay), and date due (e.g. March 14th. 2010, Monday).
Left and right margins must be 2.5 cm each and nothing will be written within these spaces. Use similar margins at the top and
bottom of each page.
Start each problem on a new page. You do not however need to start from a new page for different sections of a problem. Write
down the problem statement, complete with the necessary sketches, and identify what is given and what is to be found.
Explain calculation sequence in words (i.e., do not simply write down a series of equations). When equations are used each
symbol in the equation need to be defined.
Show actual calculated results to sufficient decimals before rounding off. Show details for your calculations and identify (label)
your answers with a box. Never show a result without showing the algebraic substitutions first.
For all graph and vector diagrams, label the axes and write down the scales used and units for each parameter. Use units
consistently in all your analysis, formulations and calculations.
Number each page consecutively and staple all pages together in the proper order. You must aim to achieve neat, clear, and
professional like. Each question in a homework set will be graded on a 10 point scale. For each set of homework, up to 10 extra
points may be earned based on the following criteria.
a. Neatness = 2 points;
b. Format and completeness = 2 points;
c. Concept and approach = 4 points; and
d. Mathematics = 2 points.
You may study together, that is encouraged. You must however submit your own work. No copying from others!
Eastern Mediterranean University
Faculty of Engineering
Department of Mechanical Engineering
Assignment Cover Page
Meng222-Strength of Materials
(Spring 2012-13)
Assignment #
Student,
Number
:………………………
Name
:………………………
Surname
:………………………
Group:………………………
Due date
Submitted on
:……………………
:……………………
Instructor
:…………………..
QUESTION
TOTAL
MARKS
d) Handing up of lab. reports
All students (new or repeating) will attend to the Labs. Attendance is very important for labs.
Experiments will be conducted under the assistant’s supervision with a group maximum three students must be in
each group.
Students are required to hand in their lab reports on time at the due one week of the experiment performed,
submission at any other time until the end of the working period of the day will be considered as a late submission
and evaluated with 50% discount, no submission accepted after the day.
The Lab Report
A lab report is required for each experiment. The report is due one week after the lab is completed. The format of
the report consists of the following.
a) A brief statement of the aim of the experiment. This may be paraphrased from the lab manual or from the books.
b) The data and results, tabulated where appropriate. The presentation must be clear and complete, with units,
uncertainties and appropriate numbers of significant figures. The equations and formulas used for deriving the results
should be given, with a complete sample calculation. Do not leave out any data, if you feel that a datum should be
ignored, explain your reasons for doing so.
Propagation of uncertainties, note that for addition and subtraction, uncertainties are added, whereas for
multiplication and division, the percentage of uncertainties are added. e.g.
(A ± a) + (B ± b) = (A+B) ± (a + b), and
(A ± a) x(B ± b)=(AB) ± (a + b)%
c) In the discussion the experiment, the procedure, and the result should be discussed. Was the experiment
appropriate for the aim? Was the procedure appropriate? Any suggestions for improvement?
How reliable are the data? What were the sources of error? A good experimentalist carefully considers all sources of
error and tries to minimizes them as much as possible. Be as quantitative as possible in your discussion of errors.
That is, do not say that a certain factor will cause an error in a measurement, any one can say it. Try to estimate how
large that error is likely to be, so that you can see whether it is significant or not. Some sources of error are more
important than others, and one does not want to waste time and effort to remove minor sources. The aim of doing an
error analysis is so that someone else can judge how reliable your results are. He or she can than decide whether or
not to use them. Results reported without an error analysis are practically useless to others.
Note that there are two general types of errors. Systematic errors are due to, e.g. improper calibration of the
instrument; such errors cause a systematic shift of all measurement and lead to a biased or inaccurate result. Random
errors cause measurements to be scattered, leading to an imprecise result. A precise result (small scatter) can still be
inaccurate ( the average value disagrees with the actual). Conversely, an accurate result can be imprecise.
Discuss whether the results are what you would expect from theory. Whenever possible, compare them with known
or accepted values. Your values, with their uncertainties, should bracket the accepted values. If they do not, try to
explain why. Resist the temptation to blame everything on poor equipment.
In many ways the discussion section is the most important in a technical report. A technician can do an experiment
under supervision, but it takes a trained scientist or engineer to explain what the results mean.
d) A CONCLUSIONS section should be included, summing up the experiment and the results
e) Makeup and Reseat Exams
Makeup exam will be given for the missing midterm exam. The reseat exam will be given for the missing final
exam or for the fail course (F, D-) or for the warning status.
Makeup and reseat exams will be given only for the following legitimate reasons with official documentation.
- Contacted a contagious disease
- Hospitalization
- Accident
- Death of immediate family members
No makeup exam will be given for QUIZES. No makeup exam will be given if no official documentation is
presented or the lecturer is not informed within three days after the exams have taken place.
An NG grade will be assigned to the student/s who have an absenteeism of more than 50% and missing exam.
No reseat exam will be given to the NG grade
Prepared by: Cafer Kızılörs
Date Prepared: 25 February 2013