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Lecture 01
1
Students
need to
know the following
•
Take any simple (nonredundant) engineering structure with arbitrary combination of
axial, torsional & bending loads
•
Draw free body diagram  determine what reaction forces/moments are unknown
•
Calculate reaction forces/moments from equilibrium
•
Calculate forces, bending moments & torques at any
section
•
Calculate all normal and shear stresses (6 in general but, two shear stresses will
generally be zero in
this class
)
•
Use Mohrs circle of stress to calculate principal normal stresses and maximum shear
stresses
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1. Will these stresses cause failure?
Need material properties & failure criteria
Excessive deformation
:
Time independent:
elastic
Time dependent:
creep & viscoelasticity
Strength of material exceeded
Nonlinear behavior:
Yield
Fracture:
Static loading:
brittle
Cyclic loading:
crackbased & stressed based
Environmental degradation
Beware of focusing on a single failure mechanism:
“Implacable animosity of inanimate object” Prof. Inglis
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 Fall '08
 YALISOVE

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