31-01-2017, 01:14 PM

03-02-2017, 11:43 AM

If you want to define a complex bend like this you need to define it through three separate bends: Two part that only bend horizontally and the center part that bends in a different bend plane.

Defining the polygon points for these bend parts is not trivial. Furthermore, we are not sure whether this complex bend is actually possible (without kinks between parts of the bend).

Our approach would be to approximate this situation by using a single bend with the combined bend radius of Rc.

Defining the polygon points for these bend parts is not trivial. Furthermore, we are not sure whether this complex bend is actually possible (without kinks between parts of the bend).

Our approach would be to approximate this situation by using a single bend with the combined bend radius of Rc.

04-02-2017, 07:32 PM

Hello Bas,

You can use the combined bend radius at the tangent point where the overlap exists, see formulae NEN 3650-1:2012 E.1.2.4.2:

[attachment=862]

Create also new tangent points as Jens also explains for the horizontal and vertical bends before and after the combined bend. You can do an exact calculation in Excel where the extra tangent points (X,Y,Z) should be. So you have multiple bend radius connecting with each other without any kinks.

You can use the combined bend radius at the tangent point where the overlap exists, see formulae NEN 3650-1:2012 E.1.2.4.2:

[attachment=862]

Create also new tangent points as Jens also explains for the horizontal and vertical bends before and after the combined bend. You can do an exact calculation in Excel where the extra tangent points (X,Y,Z) should be. So you have multiple bend radius connecting with each other without any kinks.