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EAS 209 – Spring 2008
Instructor: Human/Mosqueda
1/15/2008
1
Lecture 02
Chapter 1 - Concept of Stress
•
The main objective of the study of mechanics of
materials is to provide future engineers with the
means of analyzing and designing various machines
and load bearing structures.
•
Both the analysis and design of a given structure
involve the determination of
stresses
and
deformations
.
This chapter is devoted to the concept
of stress.
•
We will define stress shortly, but first, we will
review the concepts of equilibrium learned in
Statics.
•
All students must be able to perform a static analysis
to determine the internal forces in each structural
member and the reaction forces at the supports.
EAS 209 – Spring 2008
Instructor: Human/Mosqueda
1/15/2008
2
Lecture 02
The structure below consists of a boom and rod joined
by pins (zero moment connections)
Construct Free-Body Diagram
Detach the structure from supports and apply the loads
and reaction forces.
Four unknown forces
Three equations of
equilibrium

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