Sandwich structure testing assembly for wind power blade and transverse tensile strength testing method

Abstract

The invention relates to the technical field of wind power blades, and provides a sandwich structure test assembly for a wind power blade and a transverse tensile strength test method. The sandwich structure test assembly for the wind power blade comprises a sandwich structure, a first clamp, a second clamp, a first reinforcing part and a second reinforcing part, wherein the sandwich structure comprises a first end face and a second end face which are oppositely arranged; the first clamp is in butt joint with the first end face. The second clamp is in butt joint with the second end face. The first reinforcing part is connected with the sandwich structure and the first clamp; the second reinforcing part is connected with the sandwich structure and the second clamp. The sandwich structure and the first clamp are in reinforced connection through the first reinforcing part, and the sandwich structure and the second clamp are in reinforced connection through the second reinforcing part, so that when the first clamp and the second clamp are stretched, the damage form of the sandwich structure is in the middle area, and the damage form conforms to the failure mode of the blade; the transverse tensile strength and the elongation at break can reflect the actual performance of the sandwich structure in the wind power blade.

Description

technical field [0001] The invention relates to the technical field of wind power blades, in particular to a sandwich structure test assembly for wind power blades and a transverse tensile strength test method. Background technique [0002] At present, wind turbine blades all use core materials to increase the skin stiffness. The commonly used core materials are balsa wood and foam core materials, the commonly used balsa wood is balsa wood, etc., and the commonly used foam core materials are PVC (polyvinyl chloride) foam, PET (polyester) foam, PMI (polyimide) foam and other artificial Synthetic foam. PET and balsa have obvious anisotropy, and their longitudinal compressive strength is relatively high, so they can be used at the root of the blade. Generally, the toughness of PET foam is relatively poorer than that of PVC, so it is necessary to test whether the elongation at break of the PET core material and other core materials meets the design requirements of the blade. ...

AI Technical Summary

Problems solved by technology

[0003] In the existing core material test, during the transverse tensile strength test of the sandwich structure, the fracture of the clamping block and the upper and lower FRP end faces of the sandwich structure first occurs, which in turn causes the core material to break, and the core material cannot be obtained in the wind power blade. The true tensile strength in the sandwich structure affects the structural efficiency of the core material in the blade structure, increases unnecessary core material usage, and increases blade weight and cost

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