1 / 8

# Torsion of Thin-Walled Closed Cross-Sections - PowerPoint PPT Presentation

Torsion of Thin-Walled Closed Cross-Sections. Objective:. To find stress formula and angle of twist expressions for thin-walled closed section. Torsion Formula. T = 2qA m. Closed thin-walled tube. q = t. dM o = dF(r) = ( dA)r = (tds)r. dM o = (qds)r. dA m = ½ rds.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

Torsion of Thin-Walled Closed Cross-Sections

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

#### Presentation Transcript

Objective:

To find stress formula and angle of twist

expressions for thin-walled closed section.

T = 2qAm

Closed thin-walled tube.

q = t

dMo = dF(r) = (dA)r = (tds)r

dMo = (qds)r

dAm = ½ rds

Enclosed area Am

dMo = 2qdAm

A – Elliptical Cross-Section

If a = b, the above equation reduces the

well-known equation for solid

circular section.

L

t

l=b

Narrow Rectangular Cross-Section:

t1

L1

t1

L2

t2

l2

l1

t

t2

t

l3

b

t3

L3

a

t4

t

L4

If ‘t’ is constant then the above

becomes:

l1+l2+l3

l1+l2+l3+l4

Torsion of thin-Walled open-section:

Equivalent narrow rectangular sections with shear stress distribution.