Question about elastic limit and yield point

In summary, the elastic limit and yield point are both points on a stress-strain graph that mark the transition from elastic deformation to plastic deformation. While they may have slightly different definitions, they generally refer to the same point on the graph. The main difference is that the elastic limit is a theoretical concept, while the yield point is more practical and can be observed in materials. The deformation that occurs between these two points can be considered a mix of both elastic and plastic deformation.
  • #1
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
Relevant Equations
None
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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  • #3
Thank you very much Lnewqban
 
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What is the difference between elastic limit and yield point?

The elastic limit is the maximum stress that a material can withstand without permanently deforming, while the yield point is the stress at which a material begins to exhibit permanent deformation.

How are elastic limit and yield point measured?

Elastic limit and yield point are typically measured using a tensile test, where a sample of the material is subjected to increasing levels of stress until it reaches its breaking point.

What factors can affect the elastic limit and yield point of a material?

The elastic limit and yield point of a material can be affected by factors such as temperature, strain rate, and the presence of impurities or defects within the material.

Can a material have a higher elastic limit than yield point?

No, the yield point is always equal to or higher than the elastic limit. Once a material reaches its yield point, it will continue to deform even with a decrease in stress, while at the elastic limit, the material will return to its original shape when the stress is removed.

How do elastic limit and yield point relate to a material's strength and ductility?

A material with a higher elastic limit and yield point will generally have greater strength, meaning it can withstand higher levels of stress before breaking. Ductility, or the ability to deform without breaking, is also related to the yield point, as materials with a higher yield point will exhibit less ductility.

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