Discussion
Consider the following statements about open sections in torsion:
1. Their torsion constant carries a cube on the wall thickness.
2. They are far softer in torsion than closed sections.
3. They develop a circulating shear flow round an enclosed area.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct and connected: the torsion constant of an open section is \( \sum bt^3/3 \), and that cube on a small thickness is exactly why such sections are so soft in torsion. Statement 3 describes the closed section - an open one cannot form a circulating flow, because there is no closed path for it to circulate round.
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