Yield strength is defined as:

Yield strength is defined as the stress at which a material begins to deform plastically. This is a critical concept in materials science and engineering because it indicates the limit of elastic behavior. Below this yield point, materials typically return to their original shape once the applied stress is removed. However, once the yield strength is surpassed, the material will undergo permanent deformation, meaning it will not return completely to its original dimensions when the load is removed.

Understanding yield strength is vital for designers and engineers, as it helps to ensure that structures and components perform safely and effectively under load without experiencing irreversible changes in shape. This is particularly relevant in applications where materials are expected to maintain their integrity while subjected to significant forces.