What is Elastic limit: Definition and 13 Discussions

In materials science and engineering, the yield point is the point on a stress-strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior. Below the yield point, a material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible and is known as plastic deformation.
The yield strength or yield stress is a material property and is the stress corresponding to the yield point at which the material begins to deform plastically. The yield strength is often used to determine the maximum allowable load in a mechanical component, since it represents the upper limit to forces that can be applied without producing permanent deformation. In some materials, such as aluminium, there is a gradual onset of non-linear behavior, making the precise yield point difficult to determine. In such a case, the offset yield point (or proof stress) is taken as the stress at which 0.2% plastic deformation occurs. Yielding is a gradual failure mode which is normally not catastrophic, unlike ultimate failure.
In solid mechanics, the yield point can be specified in terms of the three-dimensional principal stresses (









{\displaystyle \sigma _{1},\sigma _{2},\sigma _{3}}
) with a yield surface or a yield criterion. A variety of yield criteria have been developed for different materials.

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  1. S

    Question about elastic limit and yield point

    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: Both seems to refer to same definition, it is the point where the elastic deformation ends and plastic deformation begins. But from...
  2. A

    B Creep and its effects on a material

    What I do not get is why should a stress much lower than yield point cause deformation in a material? If temperature is high intermolecular attraction is reduced and thus even low stress can deform things. But if it is low Then a force lower than yield point should be less than intermolecular...
  3. T

    Difference between Elastic Limit & Yield Point

    Hi All I am trying to understand a stress / strain curve for a ductile material. But I am struggling with understanding the difference between the Elastic Limit and the Yield Point. I define these terms as:- Elastic Limit - Is the point on the stress/strain curve where the material will...
  4. A

    What is the difference between the yield point and the elastic limit?

    I don't understand the difference between the elastic limit and the yield point. I understand that if you stretch a material within the elastic limit, then the material should return to its normal shape. However, the yield point is described as the point at which a permanent increase in length...
  5. P

    Specifications for elephant-resistant steel poles

    This is probably simple for an engineer, but I’m a zoologist and analytical chemist and so I would rather ask those who know. I have camera traps out on the African bush, that are monitoring the responses of leopards to artificial scents. The cameras are in steel boxes to protect them from...
  6. TheSodesa

    Maximum load that a 2mm steel cable can hold.

    Homework Statement A platform (m = 5,0kg) is suspended from 4 steel cables whose length is 3,0m and diameter 2mm. a) How much further will the platform sink if a mass of 50kg is placed on the platform? b) What is the maximum load that the wires can hold before breaking? Homework Equations...
  7. D

    What is the Elastic Limit Measurement Unit?

    Hello guys , have a question and I can not find the answer. In what units is measured elastic limit ? Thanks A lot !
  8. E

    Is Spacetime Infinitely Elastic or Does it Have an Elastic Limit?

    I understand that massive spinning objects drag spacetime along with their rotation, and that the inner region is dragged more strongly than the distant regions. It would seem that spacetime gets stretched. Does spacetime have an elastic limit, such that it could "break" at some point...
  9. K

    Deflection of beam after reaching elastic limit

    Hi, When we find out the deflection of beam, the factors considered are its geometry (moment of inertia) and young's modulus (E) of the material. As per text Hook's law 'E' is constant only till the elastic limit of the material. Assuming that the stress induced crosses the elastic limit, 'E'...
  10. Z

    Young's Modulus - estimate elastic limit

    Homework Statement I'm completing a homework for Young's Modulus and one question asks to estimate the elastic limit for the wire which was used. I can see where this approximately is on the graph I have drawn. When the question asks to estimate the elastic limit, does this mean to...
  11. D

    Polyester v. Cotton (Elastic limit)

    Homework Statement For my coursework I am to compare how the elastic limit in polyester & cotton varies when the same force is applied to them both. I want to do this because for my coursework I have decided to do why polyester is a good material for football shirts, and why, if it is...
  12. L

    Max speed of wave on a string from elastic limit given density

    How do I set this up? "The elastic limit of a piece of steel wire is 2.7 X 10^9 Pa. What is the maximum speed at which transverse wave pulses can propagate along this wire before this stress is exceeded? (The density of steel is 7.86 X 10^3 kg/m^3) I know v = \sqrt{\frac{T}{\mu}} so I guess I'd...
  13. F

    How Can You Determine the Elastic Limit of a Spring Without Causing Damage?

    Hi everybody. First of all, sorry for my English. It's not my mother tongue. We made the Hooke's Law experiment at school (high school). Everything worked out great. We had to find the spring constant and we did. But our teacher gave us an assignment for extra credits! We have to find the...