Class:
Instructor:
Texts:
Bucknell University
ENGR 230 Solid Mechanics II
Fall 2014 Course Syllabus
MWF 11:00– 11:52 AM (Dana 116) Th 1:00-1:52 PM (Dana 137)
Ashrafur Rahman
Office: Dana 311A
Office Hours: W 11:00 AM-1:00 PM, F 12:00- 1:00 PM
Email: ashrafur.rahman@bucknell.edu
[1] Riley, Sturges, and Morris, Mechanics of Materials, 6th ed., John Wiley & Sons, 2006.
[2] Abbott, A.A., Flatland: A Romance of Many Dimensions, with introduction by Thomas
Banchoff, Princeton Science Library, 2005
Reference:
[1] Hibbeler, R.C. Statics and mechanics of materials. 3rd Edition. Prentice Hall, 2004.
Class Learning Objectives
The objective of ENGR230 is to provide you with sufficient instruction and practice so that in
completing this course you have acquired the knowledge and skills necessary to relate external
loading to the deformation of a body. This will be done by establishing a proficiency in the
analysis of stress and strain, providing an introduction to failure modes, and providing a bridge
to more advanced topics in structural engineering, geotechnical engineering, and civil
engineering materials courses. Specific learning outcomes include:
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Calculate stress and strain values at a point, and apply stress transformations and Mohr’s circle
to define the state of stress on any plane through that point. (ABET a, e)
Calculate stresses associated with pure loading conditions: axial, torsion, & flexure. (ABET a, e)
Calculate stresses associated with combined loading. (ABET a, e)
Calculate deflection of beams. (ABET a, e)
Understand the principle of superposition, St. Venant’s Principle, the reciprocal theorem, and
stress concentration factors. (ABET a, e)
Understand the origins of residual stresses, elastic to plastic deformation, and failure loads.
(ABET a, e)
Determine critical buckling loads in columns. (ABET a, e)
Apply Tresca and von Mises failure theories to determine yielding failure. (ABET a, e)
Associated ABET Program Outcomes
(a) An ability to apply knowledge of mathematics, science, and engineering;
(e) An ability to identify, formulate, and solve engineering problems;
Outcomes Assessment & Grading
Your grade will be earned and determined based on your performance on the following items:
Homework: 10 %
Flatland Assessment: 5 %
Exams (2): 25 %
Final Exam: 35 %
Professionalism (see below)
ENGR 230: Fall 2014
Course Policies & Expectations
Course policies are defined to provide you with a clear view of expectations. CHECK THESE
POLICIES whenever you have a question about rules or procedures, absences, unfinished
homework, etc. These policies will be carefully followed for all students at all times to ensure
fair and unbiased treatment.
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Professionalism: You are required to conduct yourself professionally in all aspects of this
course. To ensure a positive learning environment for all present, inappropriate behavior
will not be tolerated, including: disruptive talking, noises, or conversations with classmates,
any cell phone usage or sounds (absolutely zero tolerance for texting!), computer usage,
derogatory comments, standing and/or leaving the room often during class time, and any
other actions that disturb the instructor or any of your classmates.
If you display any such behavior during the semester, your final course grade will be penalized at
the end of the semester with a loss per infraction of 5 points out of the course total of 100 points.
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Attendance: You are expected to arrive to class alert, prepared, and on time. Each student is
responsible for everything presented, announced, or assigned in class and/or posted on
Moodle/e-mail (check daily). If you miss a class, it is your responsibility to obtain the class
notes and any missed material from a classmate.
Exams: We will have two closed book-closed notes exams on Wednesday evenings during the
semester, and a comprehensive final during finals week. There are no make-up exams in
this course. A missed unexcused exam results in a grade of a zero for that assessment. A
missed excused exam results in the student’s grade on the final exam being used in place of
that exam. There are very few circumstances that warrant an excused absence from an
exam. These include:
1. A last minute medical emergency. Your healthcare provider must contact the
appropriate associate dean’s office to verify that you were “too ill to attend the
exam”.
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2. An unavoidable conflict with a university-sponsored event in which you will be
actively participating (i.e. presentation at an academic conference; participation in
a varsity sports event). You must notify the instructor by e-mail about this conflict
a minimum of one week in advance of the exam to allow time to determine if the
event qualifies for an excuse and to receive written approval.
Homework: Solving problems helps you learn and understand the concepts covered in this
course.
SUBMITTAL: HW is assigned weekly, and due at the beginning of class on Fridays. Late
homework will not be accepted, but your lowest score will be dropped. If you must miss a
Friday class, submit your assignment prior to Friday’s class time to receive credit (i.e. slide it
under the instructor’s office door any time before 10 am Friday), or arrange for a classmate to
submit it for you.
IMPORTANCE: It is imperative to work on your HW daily to keep up with the progression of
topics in the course. Although the amount of work involved is probably worth more than the
10% for which it counts, solving problems is an investment towards your learning and exam
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ENGR 230: Fall 2014
performance. Focusing on understanding the problems and gaining experience solving them,
rather than worrying about the HW grade, will help you be more successful on the exams. See
later section for HW format.
STRATEGIES: Read your class notes and textbook sections prior to starting the homework.
If you get stuck on any problems, the following steps for success are recommended: (1) Reread your class notes and the textbook section, and study the examples in the book; and, (2)
Ask a classmate, noting that working with others is encouraged, but you must submit your
own work. Except for points of clarity, the instructor will only answer homework related
questions after the assignment has been submitted. If you are having more general
conceptual misunderstandings, the instructor will be available during office hours or you
can email him to set up a meeting. This extra help is available to all students who regularly
attend class.
• Engineering Work: Engineers must properly document problem solutions in order to give
credibility to results. Solution procedures must be clearly documented and all work must be
shown in order to receive credit for problems completed on exams or HW assignments.
Sloppy, crowded work is a failure to communicate and is not acceptable. If your work is not
neat, clear, and easily comprehensible, the problem will not be graded and will receive zero
credit. All exam and HW submittals must be completed in pencil.
• Academic Integrity: Being a Bucknell student means that you accept your academic
responsibilities as defined in the University Honor Code
(http://www.bucknell.edu/x1324.xml). The highest ethical standards are expected at all
times, and alleged acts of academic misconduct will be taken seriously and dealt with
according to the university's policy (http://www.bucknell.edu/x1329.xml).
 This means that you will submit only your own work, and will assume full responsibility
for all materials bearing your name. You are encouraged to discuss homework problems
with classmates if you find that to be a positive learning experience; after any such
discussion or collaboration you are required to complete and submit your own solution.
 Providing an answer other than that which results from your supporting work is not
acceptable, and is a form of academic dishonesty. If the instructor or grader believes this
has occurred, zero credit will be earned for the HW assignment (1st offense). A 2nd
offense will be dealt with as a perceived violation of academic responsibility.
 Under no circumstances are you to present an idea that you obtained from the internet, a
friend/classmate/colleague, or other text as your own idea. Cite your references.
Homework Format Requirements and Grading Information
To encourage professional presentation of problem solutions, homework will be graded as
follows:
A. Format
A. Format
B. Procedure
C. Solution
20%
70%
10%
1. Name, date, course number, and the list of assigned problem numbers on first page.
Each subsequent page should include name, page #, and total # of pages.
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ENGR 230: Fall 2014
2. Use pencil only, and staple multiple page assignments. If you use engineering paper,
write on one side only.
3. For each problem, provide:
a. Given: Brief problem statement defining all variables presented for this problem;
Provide a sketch (e.g., free body diagram) where feasible, otherwise reference the
figure in the original problem.
b. Find: Define what you are solving for.
c. Solution: See details below
d. Final answer with a box around it
4. Work should be organized carefully and presented neatly. Sloppy work, depending on
the degree, will either not be graded at all (and the problem will receive zero credit), or
will result in the loss of the 20% of points dedicated to Format.
B. Solution Procedure
The solution method and procedure must be organized, neat, and easy to follow. This
requires the display of logical steps that make use of the principles and techniques you
have learned in class.
For each problem:
1. Properly designate the steps (with brief labels) within your solution procedure, i.e.
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EQUIL: A free body diagram is required for the use of any equilibrium equations
and for every internal force you reference.
COMP: Geometric compatibility equations
CONST: Constitutive relations
2. Write appropriate equations in symbolic form (when appropriate) or reference
textbook equations, before substituting numerical values.
3. Include proper units and highlight your final answer with a box.
4. Sloppy unorganized work will not be graded and it will receive zero credit.
C. Solution
1. Are the required parts of the solution present? Are the units included and correct?
2. Clearly highlight your final result(s). Consider your answer, and indicate if you
recognize that it is not feasible, or appears to be too large or too small, etc.
Providing an answer other than that which results from the supporting work is not
acceptable and represents a form of academic dishonesty (see “Academic Integrity” section
of syllabus).
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ENGR 230: Fall 2014
Tentative Course Schedule:
Wk
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Dates
Aug 27-29
Sep 1-5
Sep 8-12
Topic
Equilibrium of Deformable Bodies; Internal Forces
Normal and Shear Stresses; Stress Transformations;
Principal Stresses and Max Shearing Stress;
Normal and Shear Strains
Sep 15-19
Constitutive Relations
Sep 22-26
Deformation in System of Axially Loaded Members
Sep 29-Oct 3 Thermal effects; Stress concentrations; Inelastic behavior;
Oct 6-10*
Pressure Vessels; Combined Loading (Axial + Pressure);
Introduction to Torsion
* Exam #1: Wednesday 8-October @ 11am
Fall Break (Oct 11-14)
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Oct 15-17
Oct 20-24
Reading
Ch 1
Ch 2: § 1-9
Ch 2: § 10-11
Ch 3: § 1-5
Ch 4: § 1-4
Ch 5: § 1-3
Ch 5: § 4-7
Ch 5: § 8,9
Ch 6: § 1-4
14 Nov 24
Torsional Loading of Shafts; Closed and Open Sections
Ch 6: § 5-7
Combined Loading (Axial + Pressure + Torsional);
Ch 6: § 8-9
Flexural Loading: Stresses in Beams
Ch 7: § 1-4
Load, Shear Force, & Bending Moment Relationships
Ch 7: § 5-7
Combined Loading (Axial + Torsional + Pressure + Flexural);Ch 7: § 8, 10, 16
Flexural Loading: Beam Deflections
Ch 8: §1-3
Flexural Loading: Deflections by Superposition;
Ch 8: § 1-3, 6
Flexural Loading: Deflections by Conjugate Beam Method
Introduction to Columns
Ch 9: § 1-4
* Exam #2: Wednesday 19-November @ 11am
Columns; Introduction to Energy Methods
Ch 10: § 1-4
15 Dec 1-5
16 Dec 8
Energy Methods; Introduction to Failure Theory;
Review for Final Exam
10 Oct 27-31
11 Nov 3-7
12 Nov 10-14
13 Nov 17-21*
Thanksgiving Break (Nov 26-30)
Ch 10: § 5-7
Final Exam: To be scheduled during finals week (Thursday Dec 11th – Dec 18th)
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