Consider Example 3-9 of Shigley, 10th Edition—note that it is in U.S. Customary Units. The shaft is made from 1020 cold-drawn steel (see Table A-20 for strength properties). Rework this problem completely, drawing out 3-D free-body diagram and the loading diagrams (V y , M z , V z , M y , and T = M x . Construct another diagram for the resultant moment M R . Construct the Mohr’s circle sets at pulleys B and C for the maximum stress locations on the shaft at each pulley. Remember there are three Mohr’s circles at a given point. Reorder the three principal stresses and order them so that σ 1 ≥ σ 2 ≥ σ 3 . What is the maximum shear stress? What is the largest principal stress? Using the maximum shear stress theory (MSST), determine the factor of safety against yield. 1
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Consider Example 3-9 of Shigley, 10th Edition—note that it is in U.S. Customary Units. Theshaft is made from 1020 cold-drawn steel (see Table A-20 for strength properties). Reworkthis problem completely, drawing out 3-D free-body diagram and the loading diagrams (Vy,Mz, Vz, My, and T = Mx. Construct another diagram for the resultant moment MR.Construct the Mohr’s circle sets at pulleys B and C for the maximum stress locations onthe shaft at each pulley. Remember there are three Mohr’s circles at a given point. Reorderthe three principal stresses and order them so that σ1 ≥ σ2 ≥ σ3. What is the maximumshear stress? What is the largest principal stress? Using the maximum shear stress theory(MSST), determine the factor of safety against yield.
1
I ;— r- ••• - • • •
' ......X <-
\ 4
L,
v&r —X
f_.«™-L-__. - 1x •<- - .-.. , ! 0 r^
. U-f-
_J_L
?
^ 'T i
V i
j
vA- ioofy 4
^ jr -
}
f
J*- oi
ll( °) Oi Oi
j
O^t
\ (a\:
bcf) 0 1 Ol
2
Related Documents
