Slide 9

We might ask the question "Do all materials fail in a similar manner when subjected to torsional Loading?" As you will see the answer is no. To understand this you will remember that whenever a structure is subjected to torsion, the elements are in a state of pure shear. By considering the transformation of stresses, this state of pure shear, is equivalent to a state of pure compression and pure tension on planes rotated forty five degrees to the axis of the shaft. One implication of this stress state is that if the material is weak in tension, it will fail along a plane forty five degrees to the longitudinal axis of the shaft. However, if the material is ductile, meaning that it can deform in shear before breaking, it may fail along a plane ninety to the axis of the shaft.

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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