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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
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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 22-212-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? • Strength of Materials • Thermodynamics • Dynamics • All the above
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!
