School of Engineering and Computer Science
EG325: Intermediate Strength of Materials
Course Syllabus
Semester:
Class Meeting Time:
Class Location:
Prerequisites:
Co-requisites:
Fall 2011
Monday, Friday, 2:00 – 2:50 pm, Wednesday, 1:00 – 2:50 pm
DWH 114
EG202, EG208
MA203, MA315
Instructor Contact Information
Instructor:
Office Location:
Office Hours:
Email:
Phone:
Timothy D. Kostar
DWH 109 G
Monday, Wednesday, Friday, 10:00 – 12:00 noon
kostar_timothy@dwc.edu
603-577-6064
Course Description (3.0 Credits)
This course is a continuation of EG202 (Strength of Materials). It investigates material failure mechanisms
such as yielding under combined loading, brittle fracture, and fatigue. Additional topics covered by the
course include analysis of thick-walled pressure vessels, rotating disks, press fits, and contact stresses. In
addition, failure theories, safety factors, and stress concentration are covered topics. Finally, the course
includes an introduction to stress analysis utilizing commercial computational software and an associated
structural design and analysis project.
Course Textbook Information
Mechanical Behavior of Materials, 3rd Edition, N.E. Dowling, ISBN-13: 9780131863125, Prentice-Hall,
2007.
Course Objective
The objective of this course is to provide an enhanced understanding of material types and mechanical
behavior, and a working knowledge of static and dynamic structural analysis. Introduction to design of
single components will also be included.
Course Outcomes (measurements in parentheses)
1) The student will demonstrate an enhanced understanding of EG202 (Strength of Materials), and EG208
(Materials Science) compared to their understanding at the beginning of the course (HW #1, HW #2,
HW #3, Mid-Term Exam).
2) The student will demonstrate an understanding of, and the ability to analyze stress problems involving
yielding under combined loading (HW #4, HW #5, Mid-Term Exam).
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3) The student will demonstrate a working knowledge of stress analysis of common mechanical systems
involving pressure vessels, rotating disks, press fits, and bearing stress (HW #6, Mid-Term Exam).
4) The student will demonstrate the ability to apply failure theories and safety factors in structural design
and analysis (HW #7, Project, Final Exam).
5) The student will demonstrate the ability to apply stress concentration factors to problems involving
geometric irregularities (HW #8, Final Exam).
6) The student will demonstrate the ability to apply the principles of Linear Elastic Fracture Mechanics to the
failure analysis of cracked members (HW #9, HW #10, Final Exam).
7) The student will demonstrate the ability to apply a stress based approach to the analysis of notched
members experiencing cyclic loading (HW #11, HW #12, Final Exam).
8) The student will demonstrate advanced structural design and analysis skills utilizing commercial
computational software (Project).
General Education Competencies
The General Education program centers on critical thinking, communication, and global citizenship. The
primary General Education competencies that this course supports include:
-
Communicate clearly and effectively in written, oral, and electronic forms
Apply quantitative reasoning skills to solve problems
Disabled Applicants and Students
Daniel Webster College is committed to compliance with Section 504 of the Rehabilitation Act of 1973 and
its regulations. The school does not discriminate on the basis of disability in admission or access to, or
treatment or employment in, its programs and activities. The school's student disability coordinator
coordinates Section 504 compliance. Applicants or students with a disability may request an
accommodation by contacting Kathy Hipp, Associate Dean of Arts and Sciences, at 603-577-6659 or
hipp@dwc.edu.
Academic Honesty
Intellectual curiosity is at the heart of the academic enterprise. Students, faculty and administration at
Daniel Webster College consider such violations as cheating and plagiarism to be so unethical as to call
into question whether the violator should continue as a member of the College community.
Transcripts that misrepresent academic performance not only endanger students’ chances for success in
their careers but also damage the integrity and reputation of the institution.
Student Honor Pledge
Daniel Webster College believes that all students have the right to learn in an academic community that
insures fair competition, and respects truth and honesty. Academic dishonesty is not tolerated at Daniel
Webster College. The Student Honor Pledge is intended to create a community of fairness, respect, and
responsibility in the pursuit of academic enterprise. All students are expected to abide by the Student
Honor Pledge.
I pledge on my honor, as a student at Daniel Webster College, that I have neither given nor
received any unauthorized aid on this assignment/examination. For more information regarding Daniel
Webster College’s ethical standards, please refer to the current college catalog.
Grading Scale
The following scale is based on the grading structure outlined in the Daniel Webster College catalog and
is used to assign letter grades:
A = 93+
C+= 76-79
A- = 90-92
C = 70-75
B+= 87-89
D = 65-69
B = 83-86
F = Below 65
B- = 80-82
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Expectations
Homework problems from the text will be assigned on a regular basis and are subject to change. A
limited number of other assignments not in the text might be given as supplemental exercises. It is
expected that the interested student will endeavor to solve these problems. Remember that you
cannot adequately learn this material without practicing the methods. Talk to me in advance if
you have reasonable reason(s) for not being able to turn in your homework or any assignment on time.
To be fair to all students, late homework or other assignments are given a 33% reduction in points per
day that the homework / assignment is late. A “day” is defined as 24 hours, beginning at the start of
class time.
In addition, there will be a substantial design and analysis project assigned which will utilize
commercial computational software. Finally, in support of the student evaluation process, there will be
one (1) midterm exam, and one (1) comprehensive final exam. No make-ups for exams will
be given unless satisfactory advanced notice and reason is supplied to the instructor. The grades will
not be curved. The grades will be assigned based on the absolute grade scale shown above.
Active class participation is expected. In this course you will be expected to act in a professional
manner. Among other things, this includes showing up on time prepared for the task at hand. This shall
include not just being on time for class, but also for any and all additional outside meetings you will have
with group work. You will be expected to read assigned chapters/tutorials before coming to class and be
ready to actively participate. Classroom activities such as chatting, use of computer, ipod, cell phone and
other electronics are not allowed.
Students may ask questions of one another when working on out-of-class assignments. However, each
student/team must do their own work. A first occurrence of academic dishonesty will result in a
zero for that assignment for all who are involved. A second occurrence will result in an F for the course.
Note that all such occurrences must be reported in writing to the Chief Academic Officer who may
prescribe additional penalties.
Course Evaluation
Homework
25%
Structural Design/Analysis Assignment 10%
Midterm Exam
30%
Final Exam
35%
________________________________________
Total
100%
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Planned Schedule of Activities
Schedule may be modified, with announcements posted on-line.
Week
1
08/30
09/02
Reading
Chap. 1
Chap. 2
2
09/05 09/09
3
09/12 09/16
4
09/19 09/23
5
09/26 09/30
Chap. 3
Chap. 4
Chap. 5
Chap. 6.1 – 6.3
Chap. 6.4 – 6.7
Notes
6
10/03 10/07
7
10/11 10/14
Monday class
meets Tues
8
10/17 10/21
9
10/24 10/28
10
11
12
13
15
Chap. 7.1 – 7.4
Mid-Term Exam
Chap. 7.5 – 7.6
Notes
10/31 11/04
11/07 11/11
11/14 11/18
11/21 11/25
No Friday class
14
Notes
11/28 12/02
12/05 12/09
Notes
Notes
Topics
Assignments
Course Overview: Syllabus walk-thru, administrative policies, course
expectations.
Introduction: Brief review of Strength of Materials (EG202). Types of
material failure. Design and materials selection. Safety factors.
Review of Structure and Deformation of Materials: Bonding
mechanisms, Perfect crystal structure, elastic deformation and theoretical
strength, inelastic (plastic) deformation. Brief review of Materials Science
(EG208)
Survey of Engineering Materials: Overview of primary engineering
material types and their characteristics.
Mechanical Testing: Tension test: engineering and true stress-strain.
Hardness Tests, Notch-Impact tests, Bending and Torsion tests.
Stress-Strain Relationships and Behavior: Elastic deformation, 3D
Hooke’s law, shear, volume change, thermal strains.
Review of Complex and Principal Stress/Strain: Plane stress and strain,
stress transformation, Mohr’s circle, principal stresses via eigenvalues.
Review of Complex and Principal Stress/Strain: 3D stress states, 3D
principal stress and strain
Thick-Walled Pressure Vessels: Stress analysis and principle stresses
Rotating Disks: Stress analysis and principal stresses
Press Fits: Stress analysis and principal stresses
Contact / Bearing Stresses: Stress analysis
HW #1
HW #2
HW #3
HW #4
HW #5
HW #6
Yielding and Fracture under Combined Stresses: Introduction to Failure
Theories, Max. Shear Stress Failure Theory (Tresca)
Covers Chapters 1, 2, 3, 4, 5, 6 and Notes
Yielding and Fracture under Combined Stresses: Max. Distortion
Energy Failure Theory (Von-Mises)
Safety Factors in Design: Definition and examples.
HW #7
Stress Concentration: Concept, examples, and exercises.
HW #8
Stress Analysis Using COMSOL
Stress Analysis
Assignment
Chap. 8.1 – 8.4
Fracture of Cracked Members: Linear Elastic Fracture Mechanics
(LEFM)
HW #9
Chap. 8.5 – 8.7
Fracture of Cracked Members: Combined loading, mixed mode fracture,
plasticity and limitations of LEFM
HW #10
Chap. 9.1 – 9.6
Chap. 10.1 – 10.7
Notes
Fatigue of Materials, Intro to Stress Based Approach: Definition and
concepts, sources of cyclic loading, fatigue testing and damage, S-N
curves.
Stress Based Approach to Fatigue, Notched Members: Notch
sensitivity, fatigue strength reduction factors, fatigue limits, examples.
HW #11
HW #12
Probability of Failure: Definition / concept and examples.
(*) Time Permitting
Comprehensive with emphasis on second half of course
Final
Exam
12/12 12/16
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Relationship of Course to Program Outcomes
Mechanical Engineering
(slight, moderate, substantial)
Outcome
Level of
contribution
Outcome
Level of
contribution
Outcome
a
b
c
d
e
f
g
h
i
j
k
l
m
a
b
substantial
h
c
d
moderate
i
moderate
j
e
f
substantial
g
moderate
k
l
m
substantial
substantial
moderate
Description of Outcome
an ability to apply knowledge of mathematics, science, and engineering
an ability to design and conduct experiments, as well as to analyze and interpret data
an ability to design a system, component, or process to meet desired needs within realistic
constraints …
an ability to function on multi-disciplinary teams
an ability to identify, formulate, and solve engineering problems
an understanding of professional and ethical responsibility
an ability to communicate effectively
the broad education necessary to understand the impact of engineering solutions in a
global, etc., societal context
a recognition of the need for, and the ability to engage in life-long learning
a knowledge of contemporary issues
an ability to use the techniques, skills, and modern engineering tools needed for
engineering practice
an ability to apply principles of engineering, basic science, and mathematics (including
multivariate calculus and differential equations) to model, analyze, design, and realize
physical systems, components or processes.
an ability to work professionally in both thermal and mechanical systems areas.
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Relationship of Course to Program Outcomes
Aeronautical Engineering
(slight, moderate, substantial)
Outcome
Level of
contribution
Outcome
Level of
contribution
Outcome
a
b
c
d
e
f
g
h
i
j
k
l
m
n
a
b
c
substantial
slight
moderate
h
i
moderate
j
d
e
f
substantial
k
l
substantial
moderate
g
moderate
m
n
Description of Outcome
an ability to apply knowledge of mathematics, science, and engineering
an ability to design and conduct experiments, as well as to analyze and interpret data
an ability to design a system, component, or process to meet desired needs within realistic
constraints …
an ability to function on multi-disciplinary teams
an ability to identify, formulate, and solve engineering problems
an understanding of professional and ethical responsibility
an ability to communicate effectively
the broad education necessary to understand the impact of engineering solutions in a
global, etc., societal context
a recognition of the need for, and the ability to engage in life-long learning
a knowledge of contemporary issues
an ability to use the techniques, skills, and modern engineering tools needed for
engineering practice
a knowledge of aerodynamics, aerospace materials, structures, propulsion, flight
mechanics, and stability and control
design competence that includes integration of aeronautical topics
an ability to develop flight test plans and conduct in-flight experiments, as well as to
analyze, etc., the resulting data
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Stress Analysis Project Assessment Rubric
The primary learning outcomes of this design/analysis project include:
-
-
Demonstrate a general understanding of the topic including background, motivation for doing the
work, the relevance of the work, specific objectives.
Gain knowledge of, and demonstrate the ability to utilize and efficiently apply, commercial
computational software in a basic structural design and analysis setting.
Develop and demonstrate the ability to conduct design iterations with associated analysis, gather
and reduce data, create appropriate tables and graphs, draw conclusions from results,
identify/justify an acceptable design.
Demonstrate advanced technical writing skills including completeness and clarity of presentation,
grammar.
Reference:
Prior to this assignment, the students experience approximately 3 - 4 hours of introduction and examples
using the computational software in stress analysis problems. This project, and the associated report, is
completed by individual students.
Assessment:
Performance
Indicator
Criteria
Value
Beginning (1)
Developing (2)
Accomplished (3)
Exemplary (4)
Topic
Knowledge
Little to no
understanding of
topic details.
Showed some
understanding of
topic details.
Demonstrated an
understanding of the
topic details.
Demonstrated
understanding of topic
and related topic details.
Software
Utilization
Did not
demonstrate
ability to utilize
software
Demonstrated
some ability to
utilize software
Demonstrated ability to
utilize software
Demonstrated ability to
utilize and efficiently
apply software
Design and
Analysis
Did not show
ability to perform
design and
analysis iterations
Showed some
ability to perform
design and analysis
iterations
Demonstrated ability to
perform design and
analysis iterations, and
identify an acceptable
design
Demonstrated ability to
perform design and
analysis iterations,
create appropriate
tables and graphs, and
identify/justify an
acceptable design
Technical
Writing
Did not
demonstrate
advanced
technical writing
skills.
Demonstrated
some technical
writing skills.
Demonstrated ability to
write a clear and
comprehensive
technical report.
Demonstrated ability to
write a clear and
comprehensive technical
report, including
grammatical details.
Total
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