Fig. 5
From: Effect of die fillet radius on tube thinning in free bending

The measurement positions of the inner and outer wall thickness of the pipe: (a) inner wall measurement position, (b) outer wall measurement position.
From: Effect of die fillet radius on tube thinning in free bending

The measurement positions of the inner and outer wall thickness of the pipe: (a) inner wall measurement position, (b) outer wall measurement position.