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categoryهندسة ميكانيكية
schoolبكالوريوس
event_available2026-07-15
السؤال
Transcribed Image Text:
ASSESSSMENT TORSION STRESS
PROBLEM 1
The figure below shows a Fracture of a skier's tibia can be caused by catching of
the tip of the ski, thus creating a torque. If the skier's bindings are improperly set,
they will not release appropriately, and the torque will be transmitted to the tibia
at the top of the ski boot. When this happens, the tibia can break in a typical
spiral fracture pattern. How much force would it take at the end of the ski to
create such a fracture in a bone, as illustrated in the figure? Assume a pure
torque is applied to the tibia from the force on the ski, the cross-sectional
geometry of the tibia is a hollow cylinder with dimensions as shown in the figure,
and the tibia fractures at a shear stress of 15,000 psi. (10pts)
Tibia midshaft
-36 inches-
r, tibia 0.52 inches
r, tibia 0.27 inches
F
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