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Rotation in Mohr's circle

  1. Aug 3, 2016 #1
    1. The problem statement, all variables and given/known data
    for the τx'y' , i use the formula of -0.5(σx - σy)sin2θ + τxycos2θ , i found the ans is -41.3 rather than positive 41.3 , which part of my working is wrong? or I misunderstood something?

    2. Relevant equations


    3. The attempt at a solution
     

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  2. jcsd
  3. Aug 3, 2016 #2
    here's the formula:
     

    Attached Files:

  4. Aug 4, 2016 #3
    after checking many times, I still couldnt find out the mistake
     
  5. Aug 5, 2016 #4
    anyone can help ?
     
  6. Aug 7, 2016 #5

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  7. Aug 9, 2016 #6
  8. Aug 9, 2016 #7
    or it's wrong to use the transformation equation to do this question?
     
  9. Aug 9, 2016 #8

    NascentOxygen

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    Staff: Mentor

    Unfortunately, it seems that you are not getting a response at the moment.

    Have you looked at the "similar" threads listed at the foot of this page, to see whether something similar may have previously been discussed? Sometimes one can be lucky!
     
  10. Aug 9, 2016 #9
    Which thread?
     
  11. Aug 9, 2016 #10

    NascentOxygen

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    Staff: Mentor

    You don't see links to some past threads when
    you scroll way down below here
     
  12. Aug 9, 2016 #11
    no, i dont think i can find the answer for this question in other thread,can you help?
     
  13. Aug 9, 2016 #12
    I have also used sin2(-θ) and cos2(-θ) instead of sin2(θ) and cos2(θ), but i still couldnt find the answer same as the author , which part of my working goes wrong
    ?
     
  14. Aug 9, 2016 #13

    NascentOxygen

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    Staff: Mentor

    The topic is one I know nothing about, I'm sorry.
     
  15. Aug 9, 2016 #14
    ok , anyone else can help ?
     
  16. Aug 18, 2016 #15
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