My question has to do with the prestressing of spring. A spring is prestressed to increase the working life of the spring by inducing wanted stresses within the material. This is done by setting plastically deforming the material when the spring is compressed for the first time due to the plastic deformation the springs' free lenght is reduced. my question is if there is a standard to what is the setting length of the spring. Is it the solid length (L block) or is it the minimum working length (L2) of the spring length.
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