Glossary

The elastic limit is the maximum stress a material can withstand and still return to its original shape once the load is removed. Below this point, deformation is fully elastic—atoms in the material’s crystal lattice are displaced slightly but return to their original positions when the stress is released. If the stress goes beyond the elastic limit, the material enters plastic deformation, where the changes in shape are permanent and the material will not fully recover its original dimensions.

The elastic limit is closely related to, but not always identical to, the yield strength, which marks the onset of measurable permanent deformation. It is a critical property in the design of fasteners, springs, and structural components, because keeping stresses within the elastic range ensures a part can repeatedly bear loads without lasting damage. Exceeding the elastic limit can cause permanent distortion or failure, especially in applications where tight tolerances, fatigue resistance, or safety are essential.