Slide 8

Now let’s use the theory to examine in further detail the shear stress distribution in a shaft under torsional loading. We already know that the shear stresses are directly proportional to the distance from the center. It means that, for any circular shaft, the shear stress would be maximum for an element which is farthest from the center. The figure on the left shows the shear stress distribution in a solid shaft. The shear stress is zero at the center while it is maximum at the surface. The figure on the right shows the distribution of shear stress for a hollow shaft. The shear stress is minimum on the inside surface and maximum on the outer surface. As the thickness of the wall of the shaft decreases relative to the shaft diameter, the difference between the stress on the inside and outside of the shaft decreases and you obtain a more uniform stress field.

Introduction

Chalk Talks
•Basic theory
•Testing
  system
•Engineered   materials
•Turkey bone

Virtual Tests
•Aluminum
•Turkey bone
•PMMA
•Cast iron

Test Data
•Aluminum
•Turkey bone
•PMMA
•Cast iron

Lab Manual
•Engineered   materials
-Instructions
-Data sheets
•Turkey bone
-Instructions
-Data sheets
•Entire lab
  manual (.doc) (.pdf)

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