Slide 6

Since the test machine is not infinitely stiff, your measured rotation includes the rotation of both the sample and of the test system. To account for this we can model the sample and test system as springs in series, so that the total system stiffness is given by one over k total equals one over k sample plus one over k test machine. To determine the stiffness of the test sample re-arrange the equation so that one over k sample equals 1 over k total minus 1 over k machine. In a separate experiment we have measured the stiffness of the testing machine to be 42,800 N-m/radian.

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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