A steel beam has an elastic limit at 200N/mm^{2 }and an ultimate bending stress at 300N/mm^{2}.

Predict the structural consequences of a bending stress of 250N/mm^{2 Can sombody shoe me how to work this out please??}

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- Feb 8th 2013, 03:53 AMashicusPredicting the Consequences of a bending stress 250N/mm2
A steel beam has an elastic limit at 200N/mm

^{2 }and an ultimate bending stress at 300N/mm^{2}.

Predict the structural consequences of a bending stress of 250N/mm^{2 Can sombody shoe me how to work this out please??}

- Feb 8th 2013, 06:19 AMHallsofIvyRe: 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**? - Feb 8th 2013, 09:02 AMHartlwRe: Predicting the Consequences of a bending stress 250N/mm2
stress occurrs in beam as a result of loading it (local delta

**F**/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. - Feb 8th 2013, 09:32 AMHallsofIvyRe: 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! - Feb 8th 2013, 11:31 AMHartlwRe: Predicting the Consequences of a bending stress 250N/mm2
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 don’t break it you will have permanent deformation.

It is a mathematics question in the sense of drawing logical conclusions from given numerically quantified information.