Failure Mode Estimation with Inter-Fiber Failure Analysis of Composite Wind Turbine Blade

2011 ◽  
Vol 109 ◽  
pp. 84-88
Author(s):  
Soo Hyun Kim ◽  
Hyung Joon Bang
Keyword(s):  
Composite Materials ◽  
Wind Turbine ◽  
Failure Mode ◽  
Turbine Blade ◽  
Fe Analysis ◽  
Wind Turbine Blade ◽  
Analysis Model ◽  
Fiber Failure ◽  
Static Test ◽  
Mode Estimation

This paper provides an overview of the failure mode estimation result with 3D finite element (FE) analysis model of wind turbine blade. In order to predict the realistic behavior in the whole blade region, fiber failure (FF) and inter-fiber failure (IFF) analysis were applied to account delamination or matrix failure on composite materials. The Puck’s fracture criteria were used for the IFF evaluation. For the comparison of FE analysis result with the measured data of static test, a 3.5m down-scaled wind turbine blade was designed and fabricated using glass fiber epoxy composite materials. A nonlinear static structural analysis was performed and then the failure mode and the location were estimated with the FF and IFF analysis.

scholarly journals Wind turbine blade composite materials - End of life treatment methods

2019 ◽  
Vol 157 ◽  
pp. 1136-1143 ◽  
Author(s):  
K. Kalkanis ◽  
C.S. Psomopoulos ◽  
S. Kaminaris ◽  
G. Ioannidis ◽  
P. Pachos
Keyword(s):  
Composite Materials ◽  
Wind Turbine ◽  
End Of Life ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Treatment Methods ◽  
End Of Life Treatment

Postbuckling Analysis of a Wind Turbine Blade Substructure

2005 ◽  
Vol 127 (4) ◽  
pp. 544-552 ◽  
Author(s):  
Thomas M. Hermann ◽  
Dharmaraj Mamarthupatti ◽  
James E. Locke
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Composite Laminates ◽  
Shell Element ◽  
Wind Turbine Blade ◽  
Shear Locking ◽  
Static Test ◽  
Finite Element Software ◽  
Buckling Behavior ◽  
The Web

Postbuckling analysis of composite laminates representative of wind turbine blade substructures, utilizing the commercial finite element software ANSYS, is presented in this paper. The procedure was validated against an existing postbuckling analysis. Three shell element formulations, SHELL91, SHELL99, and SHELL181, were examined. It was found that the SHELL181 element with reduced integration should be used to avoid shear locking. The validated procedure was used to examine the variation of the buckling behavior, including postbuckling, with lamination schedule of a laminate representative of a wind turbine blade shear web. This analysis was correlated with data from a static test. A 100% postbuckling reserve in a composite structure representative of a shear web was quantified through test and analysis. The buckling behavior of the shear web was improved by modifying the lamination schedule to increase the web bending stiffness. Modifications that improved the buckling load of the structure did not always equate to improvements in the postbuckling reserve.

Effect of Turbulence Model to Simulation Accuracy of Wind Turbine Blade

2013 ◽  
Vol 397-400 ◽  
pp. 248-251
Author(s):  
A. Hui Yuan ◽  
Zhen Zhe Li ◽  
Tai Hong Cheng ◽  
Yun De Shen
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Turbulence Models ◽  
Computational Effort ◽  
Wind Turbine Blade ◽  
Analysis Model ◽  
Simulation Accuracy ◽  
Model And Simulation ◽  
Rans Turbulence Models ◽  
Simulation Results

With the heightened concern for renewable energy because of significant energy problems, the interest on wind energy has been greatly increased. In this study, 4 kinds of RANS turbulence models were compared and discussed based on developed analysis model. At first, a numerical model for 1kW wind turbine blade was constructed. In the following step, Spalart-Allmaras, standard k-ε, RNG k-ε and Reynolds Stress turbulence models were candidated for comparison. The analysis results show that standard k-ε or RNG k-ε model is relatively good selection under the condition of considering accuracy and computational effort simultaneously. The developed analysis model and simulation results have made a theoretical basis for improving the simulation accuracy of wind turbine blade with minimum computational effort.

Study of the Characteristic and Possibility for Applying Composite Materials to the Blades of Tidal Power Generation

2008 ◽  
Author(s):  
Kiyoshi Uzawa ◽  
Kazuro Kageyama ◽  
Hideaki Murayama ◽  
Isamu Ohsawa ◽  
Makoto Kanai ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Structural Study ◽  
Wind Turbine Blade ◽  
Solid Model ◽  
Present Moment ◽  
Aluminum Bronze ◽  
Blade Shape

Recently, several power plants from the rotation of turbine with tidal current have been tried. Since the density of seawater is 800 times as much as that of the air, the loading of water on a turbine strictly requires much more strength and stiffness of blade compared with the wind turbine. Neither wind turbine nor standard hydroelectric dam turbines can simply be submerged into an ocean current. There are some formidable technical challenges to be overcome compared with the wind turbine. Key issues are cost effectiveness, structural integrity and workability in access and installation. The metal blade has enough strength, but is too heavy to install and handle easily. The light weight and extreme strength are essential to the blade. The objective of this work is to determine the mechanical properties of the tidal turbine, and to examine the availability of the turbine blade of composite materials for an approach to eliminate the above problems. The study was conducted in the preliminary study of the demonstration plant, which will be settled in Oma Promontory, Aomori Prefecture in Japan, whose maximum power output is 300kW and turbine diameter is 11 meters. A number of materials were considered, i.e. comprised rolled steel, aluminum bronze, GFRP for blade. We made two models for structural study based on the propeller blade shape with thin section and the wind turbine blade shape with thick section. The FEM analysis were conducted as follows, Aluminum-Bronze solid model with propeller shape; the real model at the present moment in the Oma plant. Composite material solid model; same shape as propeller but applied with composite materials. Composite material shell model with wind turbine blade Shape; structured by monocoque construction with changing the thickness by 10mm from 10mm to 50mm. The properties of GFRP for the structural study were measured from the ISO-laminates, which were fabricated by VaRTM, of multi-axial non-crimp fabrics and epoxy. Furthermore, the vibratory cavitation erosion tests of Composite materials were conducted. In order to compare with the aluminum bronze and composite, each cavitations weight loss in fresh-water were measured and observed. As the result, the multi-axial GFRP for propeller type blade was insufficient in rigidity and strength of shear. It is necessary to use not GFRP but CFRP for the propeller type blade. In contrast, as for wind turbine type blade, it was led to the conclusion GFRP blade is workable. As for erosion, the durability of composite materials is remarkably inferior to metals.

Structural Properties Analysis of Composite Wind Turbine Blade

2012 ◽  
Vol 522 ◽  
pp. 602-605
Author(s):  
Lin Xu ◽  
Wen Lei Sun ◽  
An Wu
Keyword(s):  
Composite Materials ◽  
Wind Turbine ◽  
Structural Properties ◽  
Turbine Blade ◽  
Structural Characteristics ◽  
Wind Turbine Blade ◽  
Laminated Structure ◽  
Composite Blade ◽  
Material Component

In the process of wind turbine operation, the blade needs to withstand various kinds of loads. With wind turbine power kept getting bigger, the strength requirement of the blades become higher. In order to improve the strength of the blade, lots of new composite materials are use in blade material component parts. This paper studies the geometry laminated structure, external and structural characteristics of composite blade.

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