For ISO 14692 2017, defines the wall thickness, tbend, of the bend.
Typical units (depending on your unit system):
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in
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mm
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cm
The code uses Tbend to calculate the average wall thickness (tb) of the reference laminate:
tb = (2b/a)(tbend + toverlay) + [1-(2b/a)]tbend
where a is the bend angle. For more information, see Angle 1, 2, 3.
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If you do not define Tbend, then the software uses the pipe wall thickness, Wt. For more information, see Wt/Sch.
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For information on bend parameters, see Figure B.1 and Figure B.2, section B.2.2, in ISO 14692-3:2017.