Bend radius

About: Bend radius is a research topic. Over the lifetime, 3303 publications have been published within this topic receiving 35415 citations. The topic is also known as: minimum bend radius.

A modified thin-walled tube push-bending process with polyurethane mandrel

Abstract: Thin-walled (D/t > 30; D, initial outer diameter; t, initial wall thickness) bent tubes with large diameter (D > 100 mm) and small bending radius (R/D < 3; R, centerline radius) are difficult to form integrally using traditional bending methods. In this paper, using a novel loading method, a modified push-bending (MPB) process with polyurethane as mandrel was developed. A stainless steel bent tube with extreme geometrical specification (D = 144 mm, D/t = 72, and R/D = 1.94) was formed integrally by MPB. Based on analytical and finite element (FE) method, the internal pressure, i.e., contact pressure between polyurethane and tube (CPPT) were investigated. The results show that the CPPT decreases linearly from the back end to the front end of polyurethane rod and increases with smaller μ1 (the coefficient of friction between polyurethane and tube) and larger L (the center axis length of polyurethane rod), and the increase of CPPT is helpful to decrease the ovality of the bent tube.

Cable routing assembly including protective cable frame

Abstract: A cable routing assembly for providing a portal for routing low voltage cables through a wall. The cable routing assembly includes a protective cable frame, a low voltage mounting bracket, and a cover plate. The low voltage mounting bracket includes two adjustable flags for attachment to a wall. The protective cable frame includes two arms with apertures therein to enable mounting directly to the low voltage mounting bracket. Bores in the arms of the protective cable frame enable receipt of fasteners for mounting the cover plate thereto. An opening in the protective cable frame is capable of receiving low voltage cables for routing through the wall and into an adjacent room. The surface of the cable frame opening includes a rounded surface to provide a gentle bend radius to any cables routed through the cable frame.

Centered coined-bead technique for precise U-bent part fabrication

Abstract: Recently, during the fabrication of U-bent parts, increasing levels of precision have been required not only for the bend angle of the part but also for the bend radius and the flatness of its bottom surface. The conventional coined-bead technique is therefore unlikely to be applied to achieve these requirements. As an innovative variation of the coined-bead technique, the centered coined-bead technique is proposed and investigated in this study. The finite element method (FEM) was used to clearly identify the parameters of interest based on a stress distribution analysis. The results show that the centered coined-bead formation could be applied to produce a balance between the bending and reversed bending characteristics and to eliminate these characteristics in the bottom surface. Therefore, a precise bend angle and bend radius and a flat bottom surface could be achieved. The effects of the coined-bead geometry and its positioning are also examined and clearly identified, and laboratory experiments were carried out to validate the FEM simulation results. Each U-bent part could be fabricated with a precise bend angle and bend radius and a flat bottom surface using the centered coined-bead technique. The recommended coined-bead geometry and positioning are also reported.

Splice closure and fibre organiser device

Abstract: A splice closure and fibre organiser device (10) comprises a substantially elongate body member (12), closure member (16) and a foldable organiser tray (14) for accommodating at least one fibre splice and/or length(s) of excess fibre. The organiser tray which includes a plurality of fold lines (21) provided by respective living hinges is capable of being wrapped around part of the bodymember, into a generally cylindrical or part cylindrical shape, to close or partially close the closure. The fold lines enable the organiser tray to be folded into an extra dimension, from a flat planar structure into a generally cylindrical or part cylindrical shape. This enables the closure to be more compact without compromising the bend control radius characteristics of the organiser tray. By restricting the minimum bend radius of the organiser to that of the fibre to be used bend control of installed fibre can be readily achieved. The device is particularly suitable for use in FTTX applications.