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Shearing strain

  1. Oct 14, 2016 #1
    1. The problem statement, all variables and given/known data
    In the notes , refer to the circled part . It 's stated that the shearing strain is positive when the angle formed by two surfaces oriented along positive y and x axes decreases ..

    2. Relevant equations


    3. The attempt at a solution
    . As we can see from the figure( paralleogram ) , one of the angle increases , while another angle decreases , am i right ? Why the author said angle decreases ?
     
  2. jcsd
  3. Oct 14, 2016 #2
    Here it is
     

    Attached Files:

  4. Oct 15, 2016 #3
    is the notes wrong
    ?
     
  5. Oct 15, 2016 #4
    I think that could be stated more clearly. Obviously there are two surfaces oriented along each axis. To match the description to the diagram, try rewording it to:

    "...angle formed by two surfaces closest to the origin and oriented along positive y and x axes decreases .."
     
  6. Oct 16, 2016 #5
    what do you mean by it ? Can you explain further ?
     
  7. Oct 16, 2016 #6
  8. Oct 17, 2016 #7
    if the downwrads plane is sheared to the right , and the upper planes sheared to the left , then the angle formed by two surfaces closest to the origin and oriented along positive y and x axes will increase , right ?.
     
  9. Oct 17, 2016 #8
    Right!
     
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