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# Limit of proportionality watch

1. Could anyone help me out on how to locate the LOP on this graph please?
2. (Original post by Tynos)

Could anyone help me out on how to locate the LOP on this graph please?
It is not proportional at the beginning but midway it has a positive linear gradient, when the curve starts to curve it is no longer proportional. Does this help?
3. (Original post by raiden95)
It is not proportional at the beginning but midway it has a positive linear gradient, when the curve starts to curve it is no longer proportional. Does this help?
Yes ty.
4. (Original post by Tynos)

Could anyone help me out on how to locate the LOP on this graph please?
There is NO "limit of proportionality" on such a curve.
Limit of proportionality is typical of wires and springs where they obey Hooke's Law up to a point. Stress has to be proportional to strain for there to be proportionality.
Although what the other post says is true to the extent that there seems to be a small section where the line is straight (showing proportionality), the term "limit of proportionality" is not applied to the behaviour in the graph. This is a graph showing elastic hysteresis.

I would be very surprised if you actually have a question which specifically asks you to identify this point on that graph.
5. (Original post by Stonebridge)
There is NO "limit of proportionality" on such a curve.
Limit of proportionality is typical of wires and springs where they obey Hooke's Law up to a point. Stress has to be proportional to strain for there to be proportionality.
Although what the other post says is true to the extent that there seems to be a small section where the line is straight (showing proportionality), the term "limit of proportionality" is not applied to the behaviour in the graph. This is a graph showing elastic hysteresis.

I would be very surprised if you actually have a question which specifically asks you to identify this point on that graph.
I understand thank you.

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