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    Rights statement: This is the author’s version of a work that was accepted for publication in Composite Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work 3since it was submitted for publication. A definitive version was subsequently published in Composite Structures, 212, 2019 DOI: 10.1016/j.compstruct.2019.01.031

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A multi-scale model for studying failure mechanisms of composite wind turbine blades

Research output: Contribution to journalJournal article

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<mark>Journal publication date</mark>15/03/2019
<mark>Journal</mark>Composite Structures
Volume212
Number of pages10
Pages (from-to)220-229
Publication statusPublished
Early online date6/01/19
Original languageEnglish

Abstract

Composite structures have been widely used in wind turbine equipment for their high stiffness to mass ratio and high strength. A major concern in the use of composite materials is their susceptibility to various micro damage, such as fiber breakage and matrix crack, which will lead to macroscopic structural fracture. In this paper, a multi-scale modeling strategy is proposed to investigate failure mechanisms and damage evolution of composite blades with initial defects from microscopic damage (including fiber fractures and matrix cracks) to macroscopic fracture. At the microscopic scale, an isoparametric micromechanical model is developed to calculate microscopic stresses and simulate microscopic damage. At the laminar scale, the classic laminate theory is employed to evaluate the laminate stiffness. At the structural scale, a reverse modeling technology is proposed to accurately acquire structural dimensions of a wind turbine blade, and a macroscopic 3D model is implemented into ANSYS/LS-DYNA software. By comparing with the experimental data, it is demonstrated that the proposed multi-scale method is suitable to predict mechanical properties of complex composite structures effectively.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Composite Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work 3since it was submitted for publication. A definitive version was subsequently published in Composite Structures, 212, 2019 DOI: 10.1016/j.compstruct.2019.01.031