WELCOME!
STRENGTH OF MATERIALS
SPRING 2014
LESSON 1
Introduction
Review of Syllabus
So, you thought you were done with Statics…
Stress related to materials, not work
Strain related to materials, not muscles
WHO AM I?
Dr. Walter D. Thomas
Perry Hall 223C
Phone: 978-934-2775
Walter_thomas@uml.edu
Office hours:
Mondays and Wednesdays: 2 – 4 pm
Tuesdays: 10 – noon
HIGHLIGHTS OF THE
SYLLABUS
Textbook: Mechanics of Materials by Gere and Goodno, 8th ed.
through 5th edition acceptable
Three tests given in class; one with lowest score will be
dropped
Quizzes will be frequent, mostly each Monday
Class participation counts, including use of Clickers
Grade composition
Homework—10 sets total, including 1 due this Monday!
Final grade will be scaled (sigh of relief?)
One request: do the reading and attempt the homework!
OUR WIKI SPACE
This course’s Wiki space is how you will (normally) get your
homework assignments, as well as other files like homework
solutions, copies of any lecture slides, etc.
I already emailed you an invite. Just click on the link then
sign in using your UML email & password. Once you are
logged into the wiki space, look for the black menu on the
upper right corner then click on “my wikis”, then click on 22212-Spring-2014.
http://22-212-spring-2014.wiki.uml.edu/home
For now, our wiki is just a file distribution system, but
hopefully we can use more of its capabilities later in the
course…
CLICKERS!
Channel # for this course is 31. Be sure to ALWAYS have
your clicker set to 31 while sitting in this classroom.
For the first two weeks, clickers will be used in class for
practice only. After add/drop period, your answers to clicker
questions will count towards your participation grade.
Bring only your own clicker to class. If I catch anyone using
multiple clickers, I’ll ask that person to go to the Dean’s
Office and explain to Joe Hartman why they were helping
their friends cheat. Not good.
WHAT COURSES WILL BE USING A
CLICKER THIS SPRING?
A.
Strength of Materials
B.
Thermodynamics
C.
Dynamics
D.
All the above
WHAT IS THE CLICKER CHANNEL NUMBER
FOR THIS COURSE?
Rank
1
2
3
4
5
6
Responses
Other
A REVIEW OF STATICS
IN 10 MINUTES OR LESS
Free body diagrams
Support reactions
Moments
Equations of Equilibrium
We’ll use all the above simply to find the
forces, aka loads, acting on cable or beam.
Then, we can determine the stress that the
force causes, among other things…
To the board!
KEY TERMS, SYMBOLS,
CONSTANTS, ETC.
“Prismatic”: cross sectional area is uniform throughout
A = cross sectional area in mm^2, in^2, etc
L = original length of specimen, bar, object, etc.
P = applied (axial)load in lb, Kip, N, kN, etc.
δ (Greek lowercase delta) = elongation (could be pos or neg)
σ (lowercase Greek sigma) = normal stress
ε (lowercase Greek epsilon) = normal strain
Units of stress: force/area, e.g., psi, ksi, Pa, MPa
Units of strain: technically dimensionless. Sometimes mm/m
or in/ft; sometimes as a percentage, as in “0.3% strain”.
TAKE AWAYS
HW#1 will be due this Monday—already on
the wiki space. It will cover sections 1.1 –
1.6, so read those tonight!
Get your clickers registered for this course!
See my email with instructions.
Your first quiz will also be Monday,
covering material taught in class. Review
your notes, do your homework, and you
should do well on the quiz!
QUESTIONS?