The neutral line is the point of zero stress where the material transitions from compression to tension. When metal is bent, the material at the inside radius is put in a compressive state while the material at the outside radius is put in tension. This is the ratio of the location of the neutral line ( t in the image below) to the material thickness ( T). Occurs somewhere between the midpoint of the material (K-factor=0.50) and a point closer to the inside of the bend (K-factor=0.25). The inside of the bend is under compression, the outside is under tension, and the neutral axis Relates to the depth of the neutral axis a line within the sheet where the length does not change Of the metal thickness and depends on factors such as the material and type of bending operation. calculations use what is known as a K-factor Parameter of bends in a sheet metal part used to calculate the bend radius. Is required to correct for the change in length caused by bending a flat sheet. You are here: Working with sheet metal > Unfolding sheet metal components > Bend allowancesīend allowance Amount of material added to compensate for changes caused by bending sheet metal.
