Carbon nanotube springs can be up to hundreds of microns in diameter, while the length can be up to a few centimeters, and its spun structure has broad application prospects, is expected to be applied in the field of stretchable conductors, flexible electrodes, miniature strain sensors, supercapacitors, integrated circuits, solar cells, field emission sources, energy dissipation fibers and other fields, for the preparation of visible to the naked eye of the carbon nanotube electronic devices to provide the possibility of the preparation of carbon nanotube electronic devices, and also expect to applications in medical liao devices, such as tension-sensing bandages. This new structure can also be developed into a multifunctional carbon nanotube fiber composite materials can be utilized. Extension springs (tension springs) are helical springs that are subjected to axial tension, and they are generally made of materials with a round cross-section. When not under load, the coils of an extension spring are generally tightened without clearance between the coils. The use of stretch after the rebound force (tension) work, used to control the movement of the machine, storage energy, measuring the size of the force, etc., widely used in machines, instruments.
The form of its hook has side hook tension spring, long hook tension spring, English hook tension spring, German hook tension spring, half-round hook tension spring, duckbill hook tension spring, etc., and its material has stainless steel, piano steel, high carbon steel, phosphor bronze, oil tempered alloy spring steel and so on. Many different terminations or "hooks" are used to ensure the source of tension in the extension spring. Extension springs work in reverse to compression springs. Compression springs work in reverse when compressed, while extension springs work in reverse when extended or pulled apart. When the ends of an extension spring are pulled apart, the spring tries to pull them back together. Like compression springs, extension springs absorb and store energy. But unlike compression springs, most extension springs are usually under some degree of tension, even without any load. This initial tension determines how tightly the extension spring is coiled without any load.