A design for a thin-wall rectangular torsion member is shown in Figure P6.58a. This sectio...

A design for a thin-wall rectangular torsion member is shown in Figure P6.58a. This section is known to warp. A second design is shown in Figure P6.58b. For the section in the second design not to warp, the condition bt1 = htz must be satisfied.

a. Determine the thicknesses t1 and t2 so that the cross-sectional areas of both members are equal.

---

b. For a working shear stress of 70.0 MPa. determine the design torque for each member.

FIGURE P6.58a

FIGURE P6.58b