What is Autofrettage and How Does it Improve Material Elasticity?

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Autofrettage is a process that enhances the elastic limit of materials, particularly in cylindrical structures, by applying compressive stress and heat treatment. This technique increases the range of elasticity without altering the material's inherent elasticity. The primary goal of autofrettage is to induce beneficial residual stresses that reduce operational stresses during use. However, if the treated material is subjected to high temperatures, such as in a furnace, these residual stresses may be eliminated, reverting the material to its original state. Understanding these principles is crucial for optimizing material performance in engineering applications.
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I'm not sure I understand everything written on Wikipedia about it. The cylinder has compressive stress on the inside, it is heat treated to increase the elastic limit. I never knew that materials could be made more elastic by heat treatment, only that it could relieve stresses and improve life.
 
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Increasing the "elastic limit", the range of elasticity, is not the same as changing the elasticity of a material.
 
The objective is to reduce operating stresses by inducing residual stresses. If it is put into a furnace the residual stresses will go away and things will go back to where it started from.
 

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