When metal is bent the top section is going to undergo compression and the bottom section will be stretched.
Neutral line sheet metal.
The neutral line is an imaginary line that passes somewhere close to the middle of the material.
If the material did not stretch at all then the neutral line would be at 50 of the material.
Figure 2 after bending the bend area is 10 to 15 percent thinner than before bending.
K factor the location of the neutral axis in the material calculated as the ratio of the distance of the neutral axis t to the material thickness t.
Look closely a figure 1.
It is the area where the material neither stretches nor compresses in the bend.
The neutral axis is the zone or plane that separates the tension from the compression.
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This thinning of the bend area moves the neutral line of the metal in towards the radius center.
Notice how the sheet has thinned at the bend.
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Neutral axis an imaginary line that has the same length after bending as it had before bending.
The neutral axis position depends on the bend angle inside bend radius and method of forming.
The line where the transition from compression to stretching occurs is called the neutral axis.
The neutral line also called the neutral axis is an imaginary line that can be drawn through a cross section of the workpiece that represents the locus where no tensile nor compressive stresses are present on the work.
The neutral axis s behavior is the main reason the flat part needs to be smaller than the total of the formed piece s outside dimensions.