Search
 
 

MECHANICS - CASE STUDY

    Introduction


Strain Gage Rosette on Bracket

 

In order to determine the load P and its location s, a strain gage rosette is attached to the circular bar near the wall. Each gage is oriented 120o apart as shown.

What is known:

  • When loaded, the gages report strains of
         εa = 224.8 μ
         εb = -118.3 μ
         εc = 132.9 μ
  • Assume the strain gage rosette is at the wall.
  • The bracket material is steel, E = 29,000 ksi and ν = 0.29.
   
  Question

 

What is the load P and distance s?

   
    Approach

   
  • Determine the strains in the x-y coordinate system.
  • Calculate the stresses from the strains.
  • Find the bending stress and the twisting stress caused by the offset load P.
     
   
 
Practice Homework and Test problems now available in the 'Eng Mechanics' mobile app
Includes over 400 problems with complete detailed solutions.
Available now at the Google Play Store and Apple App Store.