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Math Help - Partial diff

  1. #1
    Newbie shinkoola's Avatar
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    Partial diff

    HI everybody

    Please help me about this problem. It made me crazy. I can't understand how has the equation (8) obtained??? I attached it.

    so I'm sorry about my poor English.

    Tank u very much
    Attached Thumbnails Attached Thumbnails Partial diff-11.jpg  
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  2. #2
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    Re: Partial diff

    These equations are a little confusing. Equations (1), (2) and (4) all define f and are set equal to 0. Need more info before I can say how (8) is arrived at. What is f actually?
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  3. #3
    Newbie shinkoola's Avatar
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    Re: Partial diff

    Thank u about your respone.
    But we can ignore equations (1),(2) and just use of another equations. Please just use of equations (3),(4),(5),(6),(7) and (8). and sigma is a constant. and f is a yield function in plasticity. In fact, f represents a surface in the space of (sigma1,sigma2). I have uploaded piece of this paper for u, maybe that help.
    Link of paper: [COLOR="rgb(0, 0, 0)"]Document1.pdf - 4shared.com - document sharing - download[/COLOR]
    Thank u again
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  4. #4
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    Re: Partial diff

    It's not a matter of ignoring equations; I'm saying they make no sense. I've looked at the paper and your equation (8) is not there. Are you talking about their equation (10)? That equation does make sense.
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  5. #5
    Newbie shinkoola's Avatar
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    Re: Partial diff

    sorry
    yes. equation (10)
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  6. #6
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    Re: Partial diff

    I'll need the rest of the paper to see how \varepsilon_{i j} are defined.
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