Elongation at break
Thread Content
What is the post-fracture elongation in tolerance specifications for? How is it generally used?
It refers to the percentage by which the length of a test bar increases relative to its original length when the metal material breaks under the action of an external force (tensile force). Calculation formula: Initial gauge length (L0): The gauge length of the specimen before it deforms. Final gauge length (Lh): The gauge length after the specimen breaks, with the broken parts carefully aligned with each other to be in a straight line. The formula for calculating the elongation after fracture is: σh = (Lh – Lo) / L0 * 100%
The greater the elongation after break, the better the flexibility of the material.
Strictly speaking, the elongation at break has no direct relationship with toughness. The greater the elongation after fracture, the better the plasticity.