continue stress distribution (week 2)
Tuesday, January 31, 2017
normal stresses for beams in bending
. bending stress varies linearly with distance from neutral axis, y
Tis the second-area moment about the z axis
Don't forget about the age old question of What is the meaning of ionic in intermolecular interactions?
transverse shear stress
unglued slabs unloaded
unglued slabs loaded
glued slabs unloaded
glued slabs loaded
T = X SATA
Than = av
Tmax at the neutral axis Y-zero at the outer
Surface A often very small compared to
Torsion and Scending
bending moment diagram
- a simply supported rectangular bar in bending If you want to learn more check out What does yd stand for in economics?
Combined loading - round bar in bending and torsion example: Porsche 911 rear torsion bar
top surface A max stress due to bending
Omax = MC
point B max stress due to bending
max shear stress due to torsion We also discuss several other topics like How can you describe the international criminal justice law?
Tmax = 7 -
max shear stress due to torsion
Thursday, February 2, 2017
example (3.8): figure shows a crank loaded by a force F=300 lbf that causes twisting and bending of a 3/4 in diameter shaft fixed to a support at the origin of the reference system. In actuality, the support may be an inertia that we wish to rotate, but for the purposes of a stress analysis we can consider this a statics problem Don't forget about the age old question of What happened during the paleolithic era?
a) draw separate free body diagrams of the shaft AB and the arm BC, and compute the value of all
forces, moments, and torques that act. Label the directions of the coordinate axes on these diagrams compute the maxima of the torsional stress and the bending stress in the arm BC and indicate If you want to learn more check out What is the meaning of computer forensics?
where these act. c) locate a stress element on the top surface of the shaft at A, and calculate all the stress We also discuss several other topics like What is the meaning of personal troubles in sociology?
components that act upon this element d) determine the maximum normal and shear stresses at A
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shaft BC Point Bi
M = 300 lbf · 4 in = 1200 lbf -in
Ti=300 lbf - 1.5in = 450 lbf in T = -300 lbf •1.5=-450 lbf - in
| Shaft AB
Point B: Ta=-300 lff • 4in=- 1200 lbf "in
- Ma =-30016f. 1.5in = -450 lbf in Point A: Ma = 300 lf (1.5+5) in= 1950 lbf in
To =300 lbf Hin = 1200 lbf oin 6 compute stress on arm Bc book at Bending:
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© locate max. stress at point A
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