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Math Help - Predicting the Consequences of a bending stress 250N/mm2

  1. #1
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    Question Predicting the Consequences of a bending stress 250N/mm2

    A steel beam has an elastic limit at 200N/mm2 and an ultimate bending stress at 300N/mm2.

    Predict the structural consequences of a bending
    stress of 250N/mm2



    Can sombody shoe me how to work this out please??

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  2. #2
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    Re: Predicting the Consequences of a bending stress 250N/mm2

    This is not a mathematics problem except in the very rudimentary sense of recognizing that "250" lies between 200 and 300.

    Now what do "elastic limit" and "ultimate bending stress" mean?
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  3. #3
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    Re: Predicting the Consequences of a bending stress 250N/mm2

    stress occurrs in beam as a result of loading it (local deltaF/deltaA).

    elastic limit: maximum stress you can subject beam to and still have it return to original shape.
    ultimate bending stress: stress at which rupture occurrs.


    After reaching elastic limit plastic deformation starts to take place.

    After 250, the beam will be permanently deformed.
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    Re: Predicting the Consequences of a bending stress 250N/mm2

    Thank you! That makes the answer to ashicus' question pretty obvious does't it? It's remarkable how much knowing the definitions helps!
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    Re: Predicting the Consequences of a bending stress 250N/mm2

    Quote Originally Posted by HallsofIvy View Post
    Thank you! That makes the answer to ashicus' question pretty obvious does't it? It's remarkable how much knowing the definitions helps!
    Actually, the elastic limit and ultimate bending stress are self-explanatory and sufficient information to answer the question.

    elastic: returns to original shape after deformation.
    ultimate: max (breaks)

    So if you go beyond the elastic limit but donít break it you will have permanent deformation.

    It is a mathematics question in the sense of drawing logical conclusions from given numerically quantified information.
    Last edited by Hartlw; February 8th 2013 at 10:49 AM. Reason: add "numerically quantified"
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