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.

Experimental assessment of cold-bent glass panels

Abstract: Curved glass is traditionally formed in a prefabricated mould at elevated temperatures. More recently, also cold-bending processes have been developed, in which flat glass panes can be bent at the building site. The main advantages of cold-bending processes are the reduced material costs, the ease of transportation and the production speed. “Freeform glass” is a patented coldbending system in which laminated panes are first bent on a cylindrical frame and then fixated in their curved form with a clamping system. For a given glass configuration, it was considered to apply this system for a canopy with a bending radius of only 3 meters. By means of an experimental testing program, different combinations of PVB have been investigated in order to evaluate the possibilities of each composition with respect to at the one hand the required bending energy and at the other hand the ability to carry loads according to the Dutch building codes for roofs. It was possible to bend panes to the desired curvature. According to experimental results, however, design loads were very difficult to meet. Furthermore, the experiments showed that the load-carrying capacity was highly dependent on the specific PVB interlayer (stiffness and thickness) that was used.

Minimum bending radius of Al-Li alloy extrusions in stretch bending:

Abstract: In this investigation, the attention is focused on the minimum bending radii of 2196-T8511 and 2099-T83 Al-Li alloy extrusions. To predict the failure of Al-Li alloys, sheet and extrusion stretch bending tests are developed, carried out and simulated using finite element model. The theoretical minimum bending radius is introduced to derive a safe lower limit for the bending radius which can serve as a guideline for tool and product design. Stretch bending tests of Al-Li alloys are performed using the three-point bending test and displacement-controlled stretch bending test at room temperature. The finite element model incorporates three-dimensional solid elements and ductile damage modeling. The experimental results show that Al-Li alloy extrusions in stretch bending show three types of failures, occurring at the unbent region near the entrance of the jaws, at the region below the exit of the die and within the region in contact with the die, respectively. Comparison between predicted values and experimen...

The effects of bending on the resistance of elastically stretchable metal conductors, and a comparison with stretching

Abstract: Microcracked gold films on elastomeric substrates can function as stretchable and deformable interconnects and sensors. In response to stretch or deformation, the design would seek to minimize the change in resistance for stretchable or deformable interconnects; if used as resistive sensors, a large change in resistance would be desired. This research examines the change in resistance upon bending of a microcracked conductor and compares the results with stretching such a conductor. The resistance depends on the strain in the film, which, for bending, is a function of the bending radius and the location of the film within the structure with respect to the neutral plane. The resistance decreases when the gold conductor is under compression and increases when it is under tension. The decrease in resistance under compression is small compared to the increase in resistance under tension, marginally depending on the bending radius. In contrast, the resistance under tension significantly increases with decreasi...

Fabrication for low-loss polymer optical waveguides with 90° bending using the Mosquito method

Abstract: We fabricate graded index (GI) circular core multimode polymer optical waveguides with 90° bending using the Mosquito method, and demonstrate low bending loss even if the bend radius is as small as 1 mm.

Optical laser fiber reel

Abstract: A universal laser fiber reel for use with an optical laser fiber, having a base with a base plate, the base plate having a base hub and base wall with the base wall having a base wall width not less than a minimum laser fiber wind length. A fiber cage proximate the base wall radially stores the laser fiber in the reel, the fiber cage having a fiber cage radius equal to a minimum laser fiber bend radius and a fiber cage width not less than the minimum laser fiber wind length of the laser fiber.