What is the formula to calculate ductility?

What is the formula to calculate ductility?

• A. Change in length/original length x 100
• B. Original length/change in length x 100
• C. Length/original length
• D. Percent change in area

Answer: (A)

Ductility is measured by how much a material can plastically deform before it breaks, which is commonly expressed as percent elongation from a tensile test. The calculation uses the change in length (ΔL) divided by the original gauge length (L0), then multiplied by 100 to convert to a percentage: percent elongation = (ΔL / L0) × 100. This captures how much the material can stretch relative to its starting size. For example, if a 50 mm specimen becomes 52 mm before breaking, ΔL = 2 mm and percent elongation = (2/50) × 100 = 4%. The other options either omit the percentage, use the reciprocal, or refer to a different measure (like reduction in area), which isn’t the standard way ductility is quantified.

Ductility is measured by how much a material can plastically deform before it breaks, which is commonly expressed as percent elongation from a tensile test. The calculation uses the change in length (ΔL) divided by the original gauge length (L0), then multiplied by 100 to convert to a percentage: percent elongation = (ΔL / L0) × 100. This captures how much the material can stretch relative to its starting size. For example, if a 50 mm specimen becomes 52 mm before breaking, ΔL = 2 mm and percent elongation = (2/50) × 100 = 4%. The other options either omit the percentage, use the reciprocal, or refer to a different measure (like reduction in area), which isn’t the standard way ductility is quantified.