Yield Strength
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Mechanical Properties
Definition
The stress at which a material begins to deform plastically, meaning it will no longer return to its original shape when the load is removed. It marks the boundary between elastic and plastic behavior.
Detailed Explanation
Yield strength is typically determined by the 0.2% offset method, drawing a line parallel to the elastic slope from 0.2% strain. Mild steel has a yield strength around 250 MPa, whereas precipitation-hardened stainless steels can exceed 1000 MPa. Engineers use yield strength to ensure structural components do not permanently deform under design loads.