Plastic bending -using FTU
Plastic bending -using FTU
(OP)
Hi all,
Does anyone have any knowledge of using plastic bending factors on FTU rather than FT2 (FTY) to calculate an allowable stress?
Rectangular section with K=1.5 (or esdu 01.06.01 which comes to 1.4).
I always thought it was the yield moment multiplied by the shapefactor (i.e 1.5).
Does anyone have any knowledge of using plastic bending factors on FTU rather than FT2 (FTY) to calculate an allowable stress?
Rectangular section with K=1.5 (or esdu 01.06.01 which comes to 1.4).
I always thought it was the yield moment multiplied by the shapefactor (i.e 1.5).





RE: Plastic bending -using FTU
clear as mud ?
RE: Plastic bending -using FTU
RE: Plastic bending -using FTU
Go to thread thread2-256804: Cozzone Curves earlier in this forum to see the difference between shape factor and form factor.
Ed
RE: Plastic bending -using FTU
FTB = FTU + (1-k)*FTY
There is, however, another way to calculate FTB using a longer method out of the Boeing Design Manual (1967). I've attached an image using from a MathCAD document showing this method.
RE: Plastic bending -using FTU
Given that the "shape factor" I'm familiar with, as well as the "section factor" Niu presents are both always >1, the (1-k) factor in Al's formula is probably supposed to be (k-1). The inclusion of the yield makes intuitive sense, but does not match any of my available references.
RE: Plastic bending -using FTU
K = 1.5 (for a rectangular section),
(1+4K)/5 = 1.4 (the factor you noted from ESDU)
as someone else posted out above, form factor and shape factor ...
RE: Plastic bending -using FTU
RE: Plastic bending -using FTU