Equivalent length of a BAR of any section after bending
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: Equivalent length of a BAR of any section after bending
: Equivalent length of a BAR of any section after bending -- thebigcance	Post Reply	Top of thread	Engineering Forum

Posted by: CCR5600Design ® 05/09/2009, 00:21:14 Author Profile eMail author Edit

When working with A36 steel, I figure the bend allowance to be one third of the material thickness plus the radius of the bend x 1.507 for a 90 degree bend or: Bend allowance for one degree of bend =(1/3T + R) X 1.507 / 90 where T = material thickness and R equals the bend radius. As you bend the material, it will stretch. Figure the total amount of stretch by using the above formula when you know the radius of the bend and the angle to which it was bent. The only exception I have found to this rule is when making a "hem" bend where the material is literally folded back upon itself. For this, allow 1/4 of the material thickness for the bend allowance. Think of it this way. When you bend material, the outside of the bend causes a stretching of material. The inside of the bend actually shrinks the material. At roughly 1/3 the way through the material from the inside of the bend, you will have a neutral area where the material neither stretches or is compressed. Again, this is for A36 steel. Other materials may be similar, but I do not have experience with them. Ron

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: : Equivalent length of a BAR of any section after bending
: : Equivalent length of a BAR of any section after bending -- CCR5600Design	Post Reply	Top of thread	Engineering Forum

Posted by: thebigcance ® 05/09/2009, 04:09:33 Author Profile eMail author Edit

and one more thing ron, in the case of a 45 deg bend will the fromula be divided by 45 for calculating the bend allowance for one deg of bend, and wat if a pipe of dia 50 which is say 2 mtrs long, is divided into 4 segments at different bend radii and corresponding angles.........should i find out the individual bend allowances and add by the remaining lentgh segments, to get the equivalent or flat length after bending?

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: : : Equivalent length of a BAR of any section after bending
: : : Equivalent length of a BAR of any section after bending -- thebigcance	Post Reply	Top of thread	Engineering Forum

Posted by: CCR5600Design ® 05/11/2009, 15:13:11 Author Profile eMail author Edit

You are welcome. Here are the answers to your questions: "and one more thing ron, in the case of a 45 deg bend will the fromula be divided by 45 for calculating the bend allowance for one deg of bend" No, you will multiply the bend allowance for 1 degree by 45 to achieve your desired measurement. "and wat if a pipe of dia 50 which is say 2 mtrs long, is divided into 4 segments at different bend radii and corresponding angles.........should i find out the individual bend allowances and add by the remaining lentgh segments, to get the equivalent or flat length after bending? Yes, you will need to allow for each individual bend. Ron

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: : : : Equivalent length of a BAR of any section after bending
: : : : Equivalent length of a BAR of any section after bending -- CCR5600Design	Post Reply	Top of thread	Engineering Forum

Posted by: thebigcance ® 05/15/2009, 05:16:51 Author Profile eMail author Edit

thnx ron..........that was helpful thanx and regards, ram

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: : Equivalent length of a BAR of any section after bending
: : Equivalent length of a BAR of any section after bending -- CCR5600Design	Post Reply	Top of thread	Engineering Forum

Posted by: thebigcance ® 05/09/2009, 03:59:44 Author Profile eMail author Edit

thnx ron......for a circular bar, should the value of T be replaced with the diameter.........or round sections have a different formulae.........but anyways thnx a lot for helping......and sharing ur knowledge.........

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