scholarly journals CHARACTERIZATION OF WAVINESS IN WIND TURBINE BLADES USING AIR COUPLED ULTRASONICS

2011 ◽  
Author(s):  
Sunil Kishore Chakrapani ◽  
Vinay Dayal ◽  
David K. Hsu ◽  
Daniel J. Barnard ◽  
Andrew Gross ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Air Coupled Ultrasonics

Investigation of Discrete Out-of-Plane Waviness in Composite Wind Turbine Blades Using Ultrasonic Nondestructive Evaluation

2011 ◽  
Author(s):  
Sunil Kishore Chakrapani ◽  
Vinay Dayal ◽  
Daniel Barnard ◽  
David Hsu
Keyword(s):  
Aspect Ratio ◽  
Nondestructive Evaluation ◽  
Wind Turbine ◽  
High Frequency ◽  
Turbine Blades ◽  
Element Model ◽  
Wind Turbine Blades ◽  
Out Of Plane ◽  
Process Detection ◽  
Air Coupled Ultrasonics

With the need for larger and more efficient wind turbine blades, thicker composite sections are manufactured and waviness becomes difficult to control. Thus, there is a need for more effective and field implementable NDE. In this paper we propose a method of detection and quantification of waviness in composite wind turbine blades using ultrasonics. By employing air coupled ultrasonics to facilitate faster and easier scans, we formulated a two step process. Detection was performed with single sided air coupled ultrasonics, and characterization was performed with the help of high frequency contact probes. Severity of the wave was defined with the help of aspect ratio, and several samples with different aspect ratio waves were made. A finite element model for wave propagation in wavy composites was developed, and compared with the experimental results.

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.

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 Characterization of the physical properties of extruded composites from recycled wind turbine blade material

2019 ◽  
Author(s):  
Seyed Hossein Mamanpush ◽  
Azadeh Tavousi Tabatabaei
Keyword(s):  
Physical Properties ◽  
Wind Turbine ◽  
Water Sorption ◽  
Turbine Blades ◽  
Thermoplastic Composites ◽  
Coupling Agents ◽  
Thickness Swelling ◽  
Wind Turbine Blades ◽  
Properties Of Composites

Wind turbine blades (WTB) mechanically recycled and used as a feedstock for thermoplastic composites. Physical properties (water sorption (WA), Thickness swelling (TS)) dataset of composites made from recycled wind turbine blades presented. Dataset also presented the influence of resin level, mill screen size and coupling agents on the physical properties of composites.

Experiments of Wind Turbine Blades with Rocket Triggered Lightning

2009 ◽  
Vol 129 (5) ◽  
pp. 689-695
Author(s):  
Masayuki Minowa ◽  
Shinichi Sumi ◽  
Masayasu Minami ◽  
Kenji Horii
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Triggered Lightning
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