Method and system for determining blade extension bonding shear stress based on finite element model

By using the finite element method, the modeling process is simplified and the calculation process is optimized, which solves the problem of low calculation efficiency of shear stress on the extended bonding surface of the blade tip. This enables efficient and reliable bonding strength assessment, which is suitable for wind turbine blade retrofitting and design verification.

CN122046818APending Publication Date: 2026-05-15HUANENG CLEAN ENERGY RES INST
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Patent Information

Application Number
CN202610167522.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-05
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

The existing technology has low calculation efficiency and low accuracy in calculating the shear stress of the extended bonding surface at the blade tip, which makes it difficult to meet the needs of rapid evaluation and modification of wind turbine blades, and also requires high professional skills from operators.

Method used

A finite element model-based approach is adopted. A finite element shell model is constructed by acquiring the characteristic data of the three-dimensional ply structure. The shell element is then discretized, and a structural mechanics analysis is performed by applying the design load. The spanwise and axial strains of the blades are calculated. The shear stress of the adhesive layer is calculated by combining the elastic constants of the single-layer plate, and the adhesive strength is determined by combining the preset safety factor.

Benefits of technology

It significantly improves the efficiency and accuracy of tip extension bond shear stress calculation, simplifies the modeling process, reduces computational resource requirements, is suitable for engineering applications, and improves the reliability and adaptability of bond strength assessment.

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Abstract

The invention discloses a method and system for determining blade extension bonding shear stress based on a finite element model, and belongs to the technical field of new energy. The method comprises the following steps: acquiring three-dimensional layering structure characteristic data of a blade to be analyzed, and constructing a blade finite element shell model containing a blade tip extension bonding section; a corresponding design load is applied to the finite element shell model, and mechanical response data of the blade structure are obtained through structural mechanical analysis and solution; obtaining an in-plane positive axis elastic constant of a single-layer plate of the to-be-analyzed blade, and calculating an elastic constant of the single-layer plate based on the in-plane elastic parameter; the normal stress of the target laying layer in each shell unit in the blade spanwise direction is obtained through calculation; the thickness of the target laying layers is obtained, the product of the normal stress and the thickness of each target laying layer in the blade spanwise direction is calculated, and the products of all the target laying layers in the same shell unit are accumulated to obtain the unit total force; and calculating the shear stress of the bonding layer based on the unit total force and the spanwise length of the blade tip extension bonding section.
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