How can I find a neutral axis in forging of large diameter half-elbow (dia = 42") from iron plates.
I am studying the forming of large dia 2-half elbows( Dia greater than 40"). In this case, we are cutting the plate-blank in arc geometry and then forging them in dies to make half elbows. Then these halves are welded.
There are quality issues due to large blank size and forging dies. My approach is, that if we could manage to know the exact size of the blank required and the neutral axis for its bending, then we can control the ripples and thus the weld overlapping.
For the same I don't know how to get the exact blank size; and the neutral axis.
Hello Tanpreet Singh Makkad, you are producing rather hughes parts. I guess the wall thickness will also be in the range of 10mm or more. Experimentally you could simply mark the cut blank surfaces by vertical lines or scratches or a rectangular mesh and measure after forging the difference in length at top and bottom surface. Assuming a linear strain Distribution over the wall thickness you can calculate the Position of the neutral line / axis. The larger the wall thickness and the longer the analyzed cross section, the more pronounced will be the effect (assuming an equal Distribution of the material flow along the analyzed area). If you Need it more precise, this Approach might be not sufficient though.
How can we approach this problem theoretically rather than experimentation.
Also how can we create the solution using FEM packages.
Any helps or leads will be quite helpful for me
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