Thank you for your inquiry, San-san!
For more information, please visit disc springs permanent deformation.
Permanent deformation is when a spring is subjected to a force that exceeds the elastic limit of the spring (even once only).
However, in this case, it is the permanent deformation caused by the setting process.
In general, the elastic limit has a certain relationship with the tensile strength of the material, and it can be calculated to some extent depending on the material and the geometrical dimension as to how far the spring will deform.
However, the spring constant is basically unchanged. When the fatigue occurs, the natural length of the spring will become shorter, and eventually, it becomes useless.
* Setting: In the final step, high stress over the elastic limit of the material is applied to the direction of use on the spring that has been molded and heat treated. A type of plastic working.'
Now forces don't just change the way that things move, they can also change the shape of things.
And a good example of that is Hooke's law. It says that if you apply a force to a spring, then the force stretches spring. And if you don't stretch too much, Hooke's law says that the amount of force you apply is proportional to the stretch.
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So, that means that if you apply twice the force, you get twice the stretch. If you applied three times the force, you get three times the stretch.
Now, that works until you stretch the spring too much. Now, you probably know what happens if you overstretch a spring. It won't come back to its original shape, its original length.
Why is that? It's actually quite a nice and deep question with nice and deep answer.
It's because the spring is made up of lots of molecules that are all stuck together with their own little forces between them, and if you overstretch the spring you can break those bonds for good. They don't come back when you let go and so the spring doesn't come back to its original length.
So Hooke's law only applies if you keep all those bonds between the molecules together, that is to say, if you don't overstretch the spring.
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