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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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (3) : 679-686. DOI: 10.19912/j.0254-0096.tynxb.2023-1966

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

Qin Zhiwen^1,2, Li Zhengguo³, Song Xiaofei⁴, Liu Xin^1,2, Zhang Rui⁵, Sun Jiuxiao³

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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.

Key words

wind turbine blades / sandwich structure / energy release rate / crack propagation / core machining configuration / skin/core fracture

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Qin Zhiwen, Li Zhengguo, Song Xiaofei, Liu Xin, Zhang Rui, Sun Jiuxiao. IMPACT OF CORE MACHINING CONFIGURATION ON SKIN/CORE FRACTURE IN SANDWICH STRUCTURES FOR WIND TURBINE BLADES[J]. Acta Energiae Solaris Sinica. 2025, 46(3): 679-686 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1966

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