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Strain to stress rosette calculations

  1. Nov 17, 2009 #1
    in the following questions- 4.17 and 4.18 - regarding stress-strain rosettes, can anyone see where i have gone wrong in my calculations, i think that there must be something i have not seen here(probably in my algebra) unless the books answer is incorrect which i doubt

    the questions
    http://lh5.ggpht.com/_H4Iz7SmBrbk/SwEB0MVvMyI/AAAAAAAAB_Q/Uy80NKhkTOI/Capture.JPG [Broken]

    my solution to 4.17
    http://lh4.ggpht.com/_H4Iz7SmBrbk/SwL0-mM_GiI/AAAAAAAAB_o/uP369RKUjwI/003.jpg [Broken]

    my solution to 4.18
    http://lh4.ggpht.com/_H4Iz7SmBrbk/SwL0-44GDuI/AAAAAAAAB_s/f9-jvUjpB2g/004.jpg [Broken]
    not sure if my final answer is visible, but here it is printed
    http://lh3.ggpht.com/_H4Iz7SmBrbk/SwL0-uyqX3I/AAAAAAAAB_k/tM70ZL2dACY/answer418.JPG [Broken]

    the answers i get are VERY similar to the books except for the denominators of the first term which i get (1+v)(1-2v) and in the answers the book has (1-v)
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
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