Refined Delamination Factor Failure Characterization of Composite Wind Turbine Blade

2011 ◽  
Vol 21 (8) ◽  
pp. 1227-1244 ◽  
Author(s):  
V. A. Nagarajan ◽  
S. Sundaram ◽  
K. Thyagarajan ◽  
J. Selwin Rajadurai ◽  
T. P. D. Rajan
Keyword(s):  
Wind Turbine ◽  
Composite Laminates ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Reinforced Composite ◽  
Delamination Factor ◽  
Glass Fiber Reinforced ◽  
Useful Power ◽  
Composite Blades

Wind turbines are used to convert the kinetic energy of wind into useful power. The wind turbine blades are fabricated using glass fiber-reinforced composite materials. Wind turbine blades are complex section. In order to improve the strength of the blades under varying loading conditions, spars are embedded in it. The spars are fastened with the composite shells of the blades using bolted connections. In order to affect this fastening, holes of appropriate size were drilled in the composite laminates. Delamination is the major failure in composite blades which is induced during drilling. Delamination is quantitatively measured using digital means. A comparison between the conventional ( FD) and adjusted ( FDA) delamination factors is presented. In order to effectively quantify the delamination, refined delamination factor ( FDR) is proposed. It is found that the proposed FDR predicts the failure in a better manner when compared with predictive capabilities of FD as well as FDA.

scholarly journals Simulation of Glass Fiber Reinforced Polypropylene Nanocomposites for Small Wind Turbine Blades

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 622
Author(s):  
Yasser Elhenawy ◽  
Yasser Fouad ◽  
Haykel Marouani ◽  
Mohamed Bassyouni
Keyword(s):  
Wind Turbine ◽  
Glass Fiber ◽  
Turbine Blades ◽  
Small Scale ◽  
Fiber Reinforced ◽  
Wind Turbine Blades ◽  
Element Analysis ◽  
Glass Fiber Reinforced ◽  
Horizontal Axis Wind Turbines ◽  
Multi Walled Carbon Nanotubes

This study aims to evaluate the effect of functionalized multi-walled carbon nanotubes (MWCNTs) on the performance of glass fiber (GF)-reinforced polypropylene (PP) for wind turbine blades. Support for theoretical blade movement of horizontal axis wind turbines (HAWTs), simulation, and analysis were performed with the Ansys computer package to gain insight into the durability of polypropylene-chopped E-glass for application in turbine blades under aerodynamic, gravitational, and centrifugal loads. Typically, polymer nanocomposites are used for small-scale wind turbine systems, such as for residential applications. Mechanical and physical properties of material composites including tensile and melt flow indices were determined. Surface morphology of polypropylene-chopped E-glass fiber and functionalized MWCNTs nanocomposites showed good distribution of dispersed phase. The effect of fiber loading on the mechanical properties of the PP nanocomposites was investigated in order to obtain the optimum composite composition and processing conditions for manufacturing wind turbine blades. The results show that adding MWCNTs to glass fiber-reinforced PP composites has a substantial influence on deflection reduction and adding them to chopped-polypropylene E-glass has a significant effect on reducing the bias estimated by finite element analysis.

scholarly journals Critical Factors for the Recycling of Different End-of-Life Materials: Wood Wastes, Automotive Shredded Residues, and Dismantled Wind Turbine Blades

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1604 ◽  
Author(s):  
Castaldo ◽  
De Falco ◽  
Avolio ◽  
Bossanne ◽  
Cicaroni Fernandes ◽  
...  
Keyword(s):  
Turbine Blades ◽  
Attenuated Total Reflection ◽  
Critical Parameters ◽  
Wind Turbine Blades ◽  
X Ray ◽  
Evolved Gases ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
Construction And Demolition Wastes ◽  
Ftir Spectrometry

Different classes of wastes, namely wooden wastes, plastic fractions from automotive shredded residues, and glass fiber reinforced composite wastes obtained from dismantled wind turbines blades were analyzed in view of their possible recycling. Wooden wastes included municipal bulky wastes, construction and demolition wastes, and furniture wastes. The applied characterization protocol, based on Fourier transform infrared (FTIR) spectroscopy in attenuated total reflection (ATR) mode, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDX), and thermogravimetric analysis (TG) coupled with FTIR spectrometry for the investigation of the evolved gases, revealed that the selected classes of wastes are very complex and heterogeneous materials, containing different impurities that can represent serious obstacles toward their reuse/recycling. Critical parameters were analyzed and discussed, and recommendations were reported for a safe and sustainable recycling of these classes of materials.

Nonlinear aeroelastic characterization of wind turbine blades

2014 ◽  
Vol 22 (3) ◽  
pp. 621-631 ◽  
Author(s):  
Y Bichiou ◽  
A Abdelkefi ◽  
MR Hajj
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades

Fracture Characterization of Adhesive Joints in Carbon/Epoxy Wind Turbine Blades

2012 ◽  
Author(s):  
Yi Hua ◽  
Linxia Gu
Keyword(s):  
Shear Modulus ◽  
Wind Turbine ◽  
Adhesive Joint ◽  
Turbine Blades ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Wind Turbine Blades ◽  
Fracture Characterization ◽  
Initiation And Propagation

The objective of this work is to predict the fracture behavior of adhesive joints in the 4-ply carbon/epoxy wind turbine blades through finite element method. The influence of through-thickness flaw in the adhesive layer was examined. The contour integral method was used for evaluating the stress intensity factors (SIF) at the flaw tips, while the strength of the joint was assessed through the crack initiation and propagation simulation. The effect of adhesive shear modulus has also been investigated. Results suggested that the maximum stress occurred at the adhesive-shell interface and increased stress levels were observed in the case of adhesive layer with flaw. It also highlighted distinct edge effects along the thickness of the adhesive joint. Compared to the perfect adhesive, the static strength of the adhesive joint with flaw remained unchanged. Large shear modulus of the adhesive diminished the strength of the adhesive joint with the increased SIF.

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