PROBLEM 3.135 A 1.25-m-long steel angle has an L127 ? 76 ? 6.4 cross section. From Appendix C we find that the thickness of the section is 6.4 mm and that its area is 1250 mm2. Knowing that ?all ? 60 MPa and that G ? 77.2 GPa, and ignoring the effect of stress concentrations, determine (a) the largest torque T that can be applied, (b) the corresponding angle of twist.
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