Unless otherwise specified, what is the radius of a bend in sheet metal?

The radius of a bend in sheet metal refers specifically to the inside radius of the metal being formed. This is crucial because the inside radius affects how the material behaves during the bending process, influencing factors such as stress concentration, potential for cracking, and the final geometry of the component.

In practical applications, the inside radius is the most significant measurement when calculating the minimum bend radius, which ensures that the material can be bent without exceeding its maximum strain limits. This is especially important for maintaining the integrity and performance of the finished part, as materials can be more susceptible to deformation or damage if the bend radius is too tight.

Other options do not align with the standard practices in sheet metal bending. The outside radius, while it can be measured, does not dictate the physical limitations of the bending process or the consideration of material properties. The average radius could imply a radius that does not accurately reflect the critical bending parameters. Lastly, a variable radius depending on material might apply in certain contexts but fails to establish a clear standard. Hence, referring to the inside radius provides the necessary clarity and precision needed in sheet metal fabrication.