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University of Illinois TAM 251 Mechanics of Materials
Notes Interpretor: James Kristoff
Last edited on August 30, 2008
Instructor: Dr. Keane
1 Homework due on Monday Mornings.
1
Stress
F (1) A The units of Stress are Pascals (Pa) or psi, depending on the unit system that is being used. ⊥ Stress = σ =
Pa =
N m2
(2)
psi =
lbf in2
(3)
• Tension Elongation For normal tensile stress σ > 0 • Compression Shortening For normal compressive stress σ < 0 • Internal Forces Stress σ=
Fn A
Sheer τ=
Ft A
Mechanics of Materials
8/25/2008
Notes Interpretor: James Kristoff
Last edited on August 30, 2008
Instructor: Dr. Keane
1 Homework due on Monday Mornings.
1
Stress
F (1) A The units of Stress are Pascals (Pa) or psi, depending on the unit system that is being used. ⊥ Stress = σ =
Pa =
N m2
(2)
psi =
lbf in2
(3)
• Tension Elongation For normal tensile stress σ > 0 • Compression Shortening For normal compressive stress σ < 0 • Internal Forces Stress σ=
Fn A
Sheer τ=
Ft A
Mechanics of Materials
8/25/2008
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