Discussion
Consider the following statements about Bredt-Batho torsion theory:
1. The shear flow is constant round the cell.
2. It equals the torque divided by twice the enclosed area.
3. The enclosed area means the cross-sectional area of the material.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are the Bredt-Batho result: \( q = T/2A \), constant round the cell. Statement 3 misdefines the area, which is that enclosed by the median line of the wall - for a thin box, close to the whole area of the box - and not the cross-sectional area of the material, which is very much smaller.
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