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.
关键词
风电叶片 /
夹芯结构 /
能量释放率 /
裂纹扩展 /
芯材加工构型 /
面/芯断裂
Key words
wind turbine blades /
sandwich structure /
energy release rate /
crack propagation /
core machining configuration /
skin/core fracture
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基金
国家重点研发计划项目（2022YFE0207000）、中国华能集团有限公司科技项目（HNKJ20-H54）和中国华能集团清洁能源技术研究院有限公司基金项目（TF-21-CERI01）
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