Slide 7

To understand what torsional stiffness is, we can think of the shaft as a torsional spring with torque equal to a spring constant, k, times rotation phi. From previous relations, we already know that T=G J phi over L. Comparing these two relations, we find that the torsional stiffness, k, is k=G J over L. The stiffness increases with increasing shear modulus, increases with the fourth power of the shaft diameter since J is proportional to r to the fourth power, and decreases as the shaft gets longer.

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)

Test your knowledge

Search the site