Nickel-titanium alloy wire rope and production process thereof

Abstract

The invention provides a nickel-titanium alloy wire rope and a production process thereof. The nickel-titanium alloy wire rope comprises strands which are twisted together in the wire rope twisting direction and the wire rope twisting distance, the strands comprise SMA wire strands which are twisted together, the strands comprise one core strand and six peripheral strands, and the diameter of thecore strand is larger than that of the peripheral strands; the periphery strands are wound on the periphery of the core strand and twisted into one bundle of SMA wire ropes; and the SMA wire strands comprise a core SMA wire and six peripheral SMA wires, the diameter of the core SMA wire is larger than that of the peripheral SMA wires, and the peripheral SMA wires are wound on the periphery of thecore SMA wire and twisted into a strand. The production process comprises the following steps that (1), materials are selected; (2), wire drawing is carried out; (3), slitting is carried out; (4), wire distribution is carried out; (5), stranding is carried out; (6), slitting is carried out; and (7), strand matching, rope combining and annealing are carried out.

Description

technical field [0001] The invention belongs to the technical field of building anti-seismic tensile components, and in particular relates to a nickel-titanium alloy wire rope and a production process thereof. Background technique [0002] In recent years, the development of earthquake engineering research at home and abroad has shown a trend from earthquake resistance, shock absorption and isolation to recoverable functions. The self-resetting structure is one of the main contents of the recoverable function structure. The research on self-resetting function aims to make the building structure have the ability to automatically reduce the residual deformation after encountering a strong earthquake, so as to reduce the strong earthquake disaster. Shape memory alloy (SMA) materials have unique shape memory effect and superelastic properties, and have the ability to automatically restore the original shape and strain after experiencing large strains. In recent years, as people...

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Problems solved by technology

However, both of them have their own limitations in the application of building structures: the bearing capacity of a single SMA wire is too small, and if a large number of SMA wires are used, it will be extremely difficult to anchor the ends; although SMA rods can It provides sufficient carrying capacity, but compared with wire, its self-resetting characteristics, hysteresis performance and energy dissipation capacity are all reduced, and due to the difference in production process, its cost is higher than that of SMA wire, while SMA rod There are problems such as brittle failure and easy fracture of the end thread

However, the surface of the finished silk rope twisted by a single wire is prone to unevenness (bulging), and the outer strands are squeezed against each other. Under the action of cyclic loads, fractures are likely to appear at the joints of the strands, and fatigue damage occurs, which is not conducive to the use of the structure. seismic performance

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