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.

Tension bending method and apparatus therefor

Abstract: PROBLEM TO BE SOLVED: To realize a tension bending method capable of sufficiently restraining variance of shapes after the bending per each workpiece (that is, an error against the desired shape) when a bending radius changes according to the bending region. SOLUTION: The workpiece W is imposed to a die 36a so as to be bent, while adding tension T to a long sized workpiece W. An indicator (proof stress) t concerning the mechanical strength of the workpiece W is actually measured and using the data in the preliminary survey of 'a relationship established among the indicator concerning the mechanical strength of the workpiece W, the bending radius of the workpiece W, the tension t added on the workpiece W and the spring back ratio', the tension T (T1, T2, T3) by which the spring back ratio at the time of bending the workpiece W at its radius becomes the prescribed value is determined from the indicator t concerning the mechanical strength of the workpiece W actually measured and the bending radius of the workpiece W, and while adding the tension T (T1, T2, T3) determined against the bending radius of the workpiece W being bent, the workpiece W is imposed to the die 36 so as to be copied and bent in accordance with the die 36.

Aramid fiber reinforced core for optical cable

Abstract: A fiber reinforced plastic pole with aramid fiber as reinforcing material and composed by thermosetting technology and thermoplast technology specifies a KFRP pole with continue length used for framework supporting in optical fiber cable. In device structure, use aramid fiber as reinforcing material, thermosetting resin as basal body, and thermoplast PE as sheath material; heat by special mould and form continue length by drawing work. The advantage is: tensile strength higher (larger than 1800MPa), bend radius less (half of strengthen core of glass fiber optic cable), mass lighter (density is half of that strengthen core of glass fiber optic cable), anti-fracture ( with 1100MPa tensile strength even broken) and has sheath material on surface need not extra adding.

$\hbox{MgB}_{2}$ Hollow Wires and Cables Embedded in a Mg Alloy Matrix

Abstract: The brittleness of the MgB2 wires prevents performing a cable architecture with very small bending radius, similar to NbTi Rutherford cables. Consequently, it is important to reduce the thickness of the superconducting materials in order to increase its bending strain limit. In this context, thin Ni sheathed MgB2 hollow wires, having wall thickness of the order of 20 μm and length of the order of 100 m, have been produced by the Reactive Mg-Liquid Infiltration process (Mg-RLI). The latest hollow monofilament made by Mg-RLI shows very high transport properties, having an engineering critical current density at 4.2 K, 3 T of 730 A/mm2. In this wire the small thickness of the MgB2 corona allows a twisting with pass of the order of a few cm and fulfils the thermal stability criterion for MgB2. We have demonstrated that cables made by such braided or twisted wires may be conveniently reinforced, by embedding the wires in a molten Mg bath, so that the Ni sheath is almost completely dissolved and the wires are clad by an eutectic Mg10%at Ni alloy. This alloyed matrix is structurally well connected to the MgB2 material, with minimal thermal and electrical resistance at the interface. A cable prototype based on this metallic composite has been prepared with 21 mono-core MgB2 wires, twisted around a central hole, which may be useful for cooling purposes. This cable design may be applied as current leads or in short bus-bars, for high current supply.