Figure: Circular prismatic rods with negative torques at each end. The circular rod shown has an ultimate shear strength, tult = 8 ksi, and ultimate compressive strength, Oult(comp) = -12 ksi, and an ultimate strength, oult(tensile) = 2 ksi. Which plane will be parallel to the failure plane when torque, T, is increased to failure?

Mechanics of Materials (MindTap Course List)
9th Edition
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Barry J. Goodno, James M. Gere
Chapter3: Torsion
Section: Chapter Questions
Problem 3.3.9P: A high-strength steel drill rod used for boring a hole in the earth has a diameter of 0.5 in. (see...
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I know that the answer is A=A' but I am struggling to completely conceptualize why.  The smallest ultimate strength is in tension, so it would fail when that stress is met.  

А
45°
45°
A'
B' C'
Figure: Circular prismatic rods with negative torques at each end.
The circular rod shown has an ultimate shear strength, tult = 8 ksi, and ultimate compressive strength,
Oult(comp) = -12 ksi, and an ultimate strength, oultensile) = 2 ksi. Which plane will be parallel to the failure
plane when torque, T, is increased to failure?
%3D
Transcribed Image Text:А 45° 45° A' B' C' Figure: Circular prismatic rods with negative torques at each end. The circular rod shown has an ultimate shear strength, tult = 8 ksi, and ultimate compressive strength, Oult(comp) = -12 ksi, and an ultimate strength, oultensile) = 2 ksi. Which plane will be parallel to the failure plane when torque, T, is increased to failure? %3D
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