Wind turbine blade main-girder structure based on zero Poisson's ratio and angle gradient honeycomb

Abstract

The invention discloses a wind turbine blade main-girder structure based on zero Poisson's ratio and an angle gradient honeycomb. The wind turbine blade main-girder structure comprises a shear-resistant web and cross beam plates. The cross beam plates are fixed to two sides of the shear-resistant web. The shear-resistant web comprises two clamping plates and an angle gradient honeycomb structure clamped between the two clamping plates. Each cross beam plate comprises two clamping plate and a zero Poisson's ratio honeycomb core grid clamped between the two clamping plates. The zero Poisson's ratio honeycomb core grid consists of a group of transverse draw-bulging edges, a group of transverse honeycomb edges and two groups of diagonal honeycomb edges. Each transverse draw-bulging edge and the corresponding transverse honeycomb edge are connected through two diagonal honeycomb edges, and the adjacent transverse draw-bulging edge and the corresponding transverse honeycomb edges are located on two sides of the diagonal honeycomb edges respectively. The shear stress distribution among cross beam layers and in the shear-resistant web is improved by introducing two honeycomb core structure to the main-girder structure. The main-girder structure is simple in structure and is suitable for industrial application, and rapid large-scale production can be achieved through roller forming, extrusion and other processes.

Description

technical field [0001] The invention relates to an internal structure of a wind turbine blade, in particular to a main beam structure of the wind turbine blade based on zero Poisson's ratio and angular gradient honeycomb. Background technique [0002] In order to improve energy absorption capacity and vibration and noise reduction effects, more and more laminated honeycomb structures have been applied to the design of the main beam structure of small and medium-sized wind turbine blades. However, the combination of multiple materials also highlights this layered structure. The composite main beam structure is prone to failure phenomenon of interstory shear failure. [0003] The in-plane Poisson's ratio of the honeycomb core in most laminated structures is generally positive, but it is also possible to make the structure exhibit a zero Poisson's ratio by changing the internal structure of the material. When receiving an out-of-plane bending load, zero Poisson's ratio Sonny's...

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Problems solved by technology

[0002] In order to improve energy absorption capacity and vibration and noise reduction effects, more and more laminated honeycomb structures have been applied to the design of the main beam structure of small and medium-sized wind turbine blades. However, the combination of multiple materials also highlights this layered structure. The composite main beam structure is prone to the failure phenomenon of interstory shear failure

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