Auxetic composite material pipeline and delivery line

Abstract

The invention discloses an auxetic composite material pipeline. The auxetic composite material pipeline comprises a pipe body, the pipe wall of the pipe body comprises 2N layers of concentric paving layers which are sequentially arranged, and N is a positive integer greater than or equal to 2; each paving layer comprises a base body and a reinforcing body embedded in the base body, wherein the included angle between the reinforcing body corresponding to the Nth paving layer and the axis of the pipe body and the included angle between the reinforcing body corresponding to the (2N + 1-n)th paving layer and the axis of the pipe body are the same, the reinforcing bodies in the first paving layer and the 2Nth paving layer are parallel to the axis of the pipe body, the reinforcing bodies of therest of paving layers are distributed in the base bodies of the corresponding paving layers in a spiral winding mode, and the pipe body can show a negative Poisson ratio characteristic under the effect of the 2N layers of paving layers. By arranging the even number of layers of paving layers which are arranged symmetrically, the pipeline can have the negative Poisson ratio characteristic on the whole, so that the effect of expanding in the radial direction when the axial tensile force is applied is achieved.

Description

technical field [0001] The invention belongs to the field of special pipelines, and in particular relates to an auxetic composite material pipeline and a conveying pipeline. Background technique [0002] In the field of pipeline transportation, especially in the application process of oil and gas transportation pipelines, steel pipes are often used as the main transportation pipeline due to their advantages of easy processing and high rigidity. However, they have poor corrosion resistance, heavy weight and difficult transportation, low installation efficiency and low maintenance costs. High disadvantages; with the development and progress of polymer materials, composite material pipes such as fiber reinforcement in flexible pipes gradually replace the use of steel pipes, which have good bending flexibility, easy laying, recyclable, short construction period, relatively low cost, and The problem of easy corrosion of metal pipes is overcome. [0003] The inventors found that ...

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Problems solved by technology

[0002] In the field of pipeline transportation, especially in the application process of oil and gas transportation pipelines, steel pipes are often used as the main transportation pipeline due to their advantages of easy processing and high rigidity. However, they have poor corrosion resistance, heavy weight and difficult transportation, low installation efficiency and low maintenance costs. High disadvantages; with the development and progress of polymer materials, composite material pipes such as fiber reinforcement in flexible pipes gradually replace the use of steel pipes, which have good bending flexibility, easy laying, recyclable, short construction period, relatively low cost, and Overcome the problem of easy corrosion of metal pipes

[0003] The inventors found that with the utilization of the flexible delivery pipeline, deformation problems caused by the internal pressure of the pipeline and the external pressure of the pipeline also appeared during the transportation process; when the internal pressure of the pipeline is too large, due to the positive value, due to the circumferential expansion of the pipe wall material, as the internal pressure of the pipe expands, the thickness of the pipe wall area decreases, resulting in an increase in the hoop stress, which eventually leads to the rupture of the pipe; The axial length of the pipe will increase and cannot be kept in tension, which will cause the collapse and buckling of the pipe under the action of external force, resulting in the collapse of the pipe system

[0004] The negative Poisson's ratio characteristic is opposite to the Poisson's ratio characteristic. The negative Poisson's ratio characteristic means that when stretched, the material expands laterally within the elastic range; when compressed, the material shrinks in the transverse direction instead; although there are negative Poisson's ratio characteristics on the market Poisson's ratio effect materials, but these materials are all plates, and do not form a closed loop of pipe-like negative Poisson's ratio materials

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