I need to make a flat pattern for a cylinder made from a steel plate 44mm thick laminated with explosion cladding stainless steel plate of 8mm total plate thickness is 52mm.
How I usually work is take the mean diameter of the cylinder (Inside diameter + thickness ) * PI. To get the developed length of the cylinder. resulting in use of Kfactor 0.5
But now there are materials bonded to each other I fear the Kfactor of 0.5 might not be correct.
Additional the laminated plate 8mm is on the inside diameter side.
The plate will be rolled into shape.
What Kfactor should I use in this case or is 0.5 a good Kfactor?