Question about elastic limit and yield point

AI Thread Summary
The discussion centers on the distinction between the elastic limit and the yield point in material deformation. While both terms indicate the transition from elastic to plastic deformation, they may represent different points on a stress-strain graph. The elastic limit is where elastic deformation ends, while the yield point signifies the onset of plastic deformation. Some sources suggest that these points are identical, while others indicate they differ. Clarifying this distinction is crucial for understanding material behavior under stress.
songoku
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Homework Statement
This is not homework

I want to ask about the difference between elastic limit and yield point. Please see below
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1647571156449.png


Point B is elastic limit and point C is yield point.

From this link: https://en.m.wikipedia.org/wiki/Yield_(engineering)#Definition

The definition given is:

1647571343367.png


Both seems to refer to same definition, it is the point where the elastic deformation ends and plastic deformation begins. But from the graph, the points are different.

And also from this link: https://physics.stackexchange.com/questions/509742/permanent-set-point-vs-elastic-limit

There is graph:
1647571490630.png


In this graph, elastic limit and yield point are one point.

My questions:
Is point of elastic limit the same as yield point?

If no, what is the difference between those two points? And what deformation happens between elastic limit and yield point, is it elastic deformation or plastic deformation?

Thanks
 
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Thank you very much Lnewqban
 
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