desing for bending-torsion stress
TRANSCRIPT
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7/22/2019 Desing for Bending-Torsion Stress
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Agricultural and Biological Engineering, Purdue University Hartono Su
Most important points in this lesson
Normal stress due to tension o r compressi
P= force, N(lbf);A= area (m2, in
2)
Max. normal st ress du e to bending momen
M= moment, Nm(lb-in); c= max distanfrom neutral plane, m(in);I= area mom
of inertia, m4(in
4). Note tension/compre
Moment o f inert ia =A
dAyI 2
Rectangular sectionI= bh3/12. Hollow circularI=
-Ri4
)/4. Others see table.Parall el axis theoremIx'=Ix+ d
2A.
Max. shear stress due to torsion
T= torsion, Nm(lb-in); r= max distancefrom neutral plane, m(in);J= polar mom
of inertia, m4(in4).
Hollow circularJ= (R4-Ri4)/2. Others see table.
A
P
=
I
Mc=
J
Tr=
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Solution
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Agricultural and Biological Engineering, Purdue University Hartono Su