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Using Ti-89 to solve for Three dimensional Principle Stresss

  1. Sep 19, 2013 #1
    I've got a TI-89 Titanium

    I've taking a class in Mechanical Design and my professor informs me that we need to be able to solve the equation (equation 3-15) shown in the attachment. I've been trying to find a way to program it into my calculator, but haven't had any real success.

    The purpose of the program is to solve for sigma

    I tried writing a program with ProgramEditor. I followed the outline given at:


    But when I attempt to use the equation in HOME it asks me for sigma, which is what I want to solve for.

    Any suggestions on what I could do?

    Help is always appreciated.

    Attached Files:

  2. jcsd
  3. May 4, 2014 #2
    I'm sorry you are not finding help at the moment. Is there any additional information you can share with us?
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