A multifunctional fixture with multiple negative Poisson ratio effect

摘要

A multi-functional fixture having a multiple negative Poisson ratio effect, which is characterised by comprising a top part of the fixture, a round part of the fixture and a rear part of the fixture, where the upper part of the fixing piece consists of a series of evenly distributed arc-shaped concave structures with a negative Poisson ratio, the distance between the extreme concave angle of each arch and the neutral axis D3, the outer diameter of the rotor section D2,where the distance between the extreme concave angle of each arc and the outside of the rotor (D3-D2)/2, and its relation to the outer diameter of the rotor, meets the following conditions: where the internal concave angle i of each arc from 50o to 70 o is sufficient, the number N1 of the arc-shaped concave edges at the top of the mounting piece satisfies the following condition: 9-N1-25, the round-section of the mounting piece being made of an external circular tube with a negative Poisson ratio and a support structure having: negative Poisson ratio,where the number of N2 of the elements with a negative Poisson ratio of the outer circle along the circumference direction should meet the conditions: N2 to 6 and N2 is equal, where the ratio of the number of N2 of the elements with a negative Poisson ratio of the outer roundabout along the circumference direction and the enclosed angle a between adjacent elements in the support structure fulfils the condition: the thickness D2/2-R1 of the outer track and the support structure should meet the following condition: D2/16-D2/2-R1-D2/8, R1 being the inner diameter of the centre of the track,where the relation between the length L1 of the upper part of the fixing piece and the length L2 of the round-wheel part of the fixing piece fulfils the following condition: where the relationship between the diameter D1 of the component at the rear of the fixing piece and the external diameter D2 of the rotor part of the fixing piece fulfils the following condition: 1,1-D1/D2, the relationship between the diameter D1 of the component at the rear of the fixing piece and the length L3 of the function part at the rear of the fixing piece fulfils the following condition: 3,5-D1/L3-10,3.