IMPACT OF CORE MACHINING CONFIGURATION ON SKIN/CORE FRACTURE IN SANDWICH STRUCTURES FOR WIND TURBINE BLADES

Qin Zhiwen; Li Zhengguo; Song Xiaofei; Liu Xin; Zhang Rui; Sun Jiuxiao

doi:10.19912/j.0254-0096.tynxb.2023-1966

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IMPACT OF CORE MACHINING CONFIGURATION ON SKIN/CORE FRACTURE IN SANDWICH STRUCTURES FOR WIND TURBINE BLADES

更新时间：2025-10-18

- IMPACT OF CORE MACHINING CONFIGURATION ON SKIN/CORE FRACTURE IN SANDWICH STRUCTURES FOR WIND TURBINE BLADES
- Vol. 46, Issue 3, Pages: 679-686(2025)
- 作者机构：
  
  1. 中国华能集团清洁能源技术研究院有限公司,北京 102209
  2. 国家能源海上风电工程与运行技术研发中心,北京 102209
  3. 武汉纺织大学材料科学与工程学院,武汉 430200
  4. 北京鉴衡认证中心,北京 100013
  5. 浙江联洋新材料股份有限公司,嘉兴 314511
- 作者简介：
- 基金信息：
- DOI：10.19912/j.0254-0096.tynxb.2023-1966
  CLC： TK83
- Published Online：07 April 2025，
  
  Published：2025
- 稿件说明：
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秦志文, 李政国, 宋笑非, 刘鑫, 张睿, 孙九霄. 芯材加工构型对风电叶片夹芯结构面/芯断裂性能的影响[J]. 太阳能学报, 2025, 46(3): 679-686.

Qin Zhiwen, Li Zhengguo, Song Xiaofei, et al. IMPACT OF CORE MACHINING CONFIGURATION ON SKIN/CORE FRACTURE IN SANDWICH STRUCTURES FOR WIND TURBINE BLADES[J]. 2025, 46(3): 679-686.
秦志文, 李政国, 宋笑非, 刘鑫, 张睿, 孙九霄. 芯材加工构型对风电叶片夹芯结构面/芯断裂性能的影响[J]. 太阳能学报, 2025, 46(3): 679-686. DOI： 10.19912/j.0254-0096.tynxb.2023-1966.

Qin Zhiwen, Li Zhengguo, Song Xiaofei, et al. IMPACT OF CORE MACHINING CONFIGURATION ON SKIN/CORE FRACTURE IN SANDWICH STRUCTURES FOR WIND TURBINE BLADES[J]. 2025, 46(3): 679-686. DOI： 10.19912/j.0254-0096.tynxb.2023-1966.

摘要

复合材料面板/芯材分层是大型风电叶片夹芯结构的突出失效模式。为提高夹芯结构面/芯断裂强度

设计Plain、DGP以及GPC共种芯材加工构型

通过芯材槽孔结构设计调控夹芯结构面板/芯材的断裂性能。采用Ⅰ型裂纹夹层板断裂实验方法研究复合材料夹芯结构面/芯断裂强度和破坏行为。实验结果表明

GPC（SG）加工结构可大幅提高夹芯结构试样的面板/芯材断裂承载能力

其次是 DGP和GPC（DG）加工结构

对于Plain芯材夹芯结构

面/芯断裂发生在芯材内部

裂纹扩展稳定

断裂强度与芯材密度相关

对于DGP、GPC（SG）以及GPC（DG）芯材夹芯结构

当面/芯断裂发展到树脂槽和柱位置时

裂纹发展受到阻碍

随着载荷的增加

裂纹绕过树脂浅槽

树脂柱脆性断裂

泡沫芯材中的树脂柱和槽提高了夹芯结构面/芯断裂的应变能释放率。

Abstract

Skin/core delamination is one of the prominent failure modes of large wind turbine blade sandwich structure. In this paper

three categories of core machining configurations （namely Plain

DGP

and GPC） were designed in order to enhance the skin/core fracture performance of sandwich structures. Mode I fracture tests were conducted to investigate peel strengths and fracture behaviors of the sandwich structure. Experimental findings indicated that the GPC（SG） machining configuration showed great improvement of the skin/core peeling resistance of sandwich samples

followed by the DGP and GPC（DG） samples. For Plain core sandwich sample

crack propagation along the fracture surface was in a stable manner. In addition

the corresponding fracture load and strain energy release rate were continuous with crack propagation. In contrast

the crack propagation of skin/core fracture of DGP

GPC（SG）

and GPC（DG） samples were inhibited when the crack front reached the vicinity of pre-implanted resin pillars

As the load continued to increase

crack paths tended to bypass the pre-implanted resin holes and grooves with resin pillars fractured in a brittle manner

implying that the pre-implanted resin pillars increase the strain energy release rate of skin/core fracture of designated sandwich structure.

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Keywords

references

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