Figure 1. Geometry of composite ring before (left) and after (right) slitting. a = inner radius of composite ring, b = outer radius of composite ring, r = radius measured at a point of the ring thickness, t = thickness of the ring, P1 and P2 = reference point for measurement of distance change, _o = angle between the 2 points before cutting, _f = angle between the 2 points after cutting, _o = distance between the 2 points before cutting, and _f = distance between the 2 points after cutting.