Key Features:

• Ductility Indicator: It indicates high values of elongation, which means much greater deformation is possible without rupture. For joints, this essential requirement is very important in forming and fabrication processes.
• Stress-Strain Relation: Measured during tensile testing, such elongation determines how the material behaves under a mechanical load and helps provide the material's formability.
• Material Comparison Tool: Engineers use elongation for stretching a material before comparing it to other metals, especially in choosing metals for structural or load-bearing applications.

Elongation becomes important in choosing the material for applications that are, say, bending, drawing, or stretching, like an automotive panel, pipeline, or structural component. Such metals with high elongation could absorb energy and deform rather than fail suddenly, thus rendering them satisfactory with strength and flexibility as a combined utility. It helps engineers design more robust structures and products that withstand everyday mechanical demand more safely.