Neutral Line In Sheet Metal

This thinning of the bend area moves the neutral line of the metal in towards the radius center.

Neutral line in sheet metal.

The neutral line is an imaginary line that passes somewhere close to the middle of the material. The location of the neutral axis varies and is based on the material s physical properties and its thickness. When metal is bent the top section is going to undergo compression and the bottom section will be stretched. The neutral axis is the zone or plane that separates the tension from the compression.

Free delivery with 45 order. Neutral axis an imaginary line that has the same length after bending as it had before bending. The k factor in sheet metal working is the ratio of the neutral axis to the material thickness. The k factor is the ratio of the neutral axis location t to the material thickness mt.

And by having t and the sheet thickness t we can calculate the k factor as follow. Figure 2 after bending the bend area is 10 to 15 percent thinner than before bending. 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 line where the transition from compression to stretching occurs is called the neutral axis.

M d building products 1 ft. By using it you get the bend allowance which is in essence the length of the curved neutral axis. It varies according to material its thickness bend radius and bending method. Free delivery with 45 order.

Its location in the material is a function of the forces used to form the part and the material yield and tensile strengths. To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r. The neutral axis position depends on the bend angle inside bend radius and method of forming. Notice how the sheet has thinned at the bend.

22 gauge metal sheet model 801447 8 98 8 98. 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. Our design engineers typically use a factor of 0 4 for our air formed press brake parts. To calculate r which is the radius of the arc on the neutral axis we can use the following equation.

If the material did not stretch at all then the neutral line would be at 50 of the material. Look closely a figure 1. When you bend sheet metal the neutral axis shifts toward the inside surface of the bend. I had a question on k factors for our 3 d modeling software.

It is the area where the material neither stretches nor compresses in the bend. Set your store to see local availability add to cart.