Probabilistic micromechanical analysis of composite material stiffness properties for a wind turbine blade

2015 ◽  
Vol 131 ◽  
pp. 905-916 ◽  
Author(s):  
Ghulam Mustafa ◽  
Afzal Suleman ◽  
Curran Crawford
Keyword(s):  
Composite Material ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Micromechanical Analysis ◽  
Material Stiffness ◽  
Stiffness Properties

Modal Aanalysis of the Composite Material Blade

2010 ◽  
Vol 34-35 ◽  
pp. 1374-1378 ◽  
Author(s):  
Jian Hua Li ◽  
Cai Ming Fu ◽  
Wen Gui Mao
Keyword(s):  
Composite Material ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Dynamic Stress ◽  
Great Influence ◽  
Material Model ◽  
Wind Turbine Blade ◽  
Modulation Method ◽  
Mode Shapes ◽  
Blade Model

Dynamic stress of wind turbine blade has great influence on its reliability and fatigue life. In order to decrease the magnitude of dynamic stress, frequency modulation method is often used to avoid resonance. This paper created composite material model for a wind turbine blade. Blade model was imported to abaqus environment for modal analysis. In view of the characteristics of fiber reinforces plastic, a mesh was built to carry out the model analysis, and the first 6 orders of the vibration frequencies and mode shapes were obtained, by imposing certain bound on the root of blade. Meanwhile, The analysis results of the composite material blade considering stiffening effect were obtained. This method can shorten modeling time and improve working efficiency, and also it is the base for blade structure calculation and check and new product developing.

scholarly journals Fatigue of Composite Material Beam Elements Representative of Wind Turbine Blade Substructure

10.2172/14386 ◽  
1998 ◽  
Author(s):  
J F Mandell ◽  
D D Samborsky ◽  
D W Combs ◽  
M E Scott ◽  
D S Cairns
Keyword(s):  
Composite Material ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Beam Elements

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.

scholarly journals An effect of humid climate on micro structure and chemical component of natural composite (Boehmeria nivea-Albizia falcata) based wind turbine blade

2018 ◽  
Vol 31 ◽  
pp. 01005
Author(s):  
S. Sudarsono ◽  
P. Purwanto ◽  
Johny W Sudarsono
Keyword(s):  
Composite Material ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Micro Structure ◽  
Humid Climate ◽  
Boehmeria Nivea ◽  
Material Component ◽  
Before And After ◽  
Natural Composite

In this work, wind turbine blade NACA 4415 is fabricated from natural composite of Boehmeria nivea and Albizia falcate. The composite fabrication method used is hand lay up method. The aim of the work is to investigate an effect of humid climate of coastal area on micro structure and chemical composition of composite material of the blade. The wind turbine is tested at Pantai Baru, Bantul, Yogyakarta for 5.5 months. The micro structure scanning is performed with Scanning Electron Microscope (SEM) and material component is measured with Energy Dispersive X-ray spectrometer (EDS). The samples are tested before and after the use within 5.5 month at the location. The results show that composite material inexperienced interface degradation and insignificant change of micro structure. From EDS test, it is observed that Na filtration reduces C and increases O in composite material after 5.5 months.

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