scholarly journals Failure Analysis of Small Composite Sandwich Turbine Blade Subjected to Extreme Wind Load

2011 ◽  
Vol 14 ◽  
pp. 1973-1981 ◽  
Author(s):  
C.P. Chen ◽  
T.Y. Kam
Keyword(s):  
Failure Analysis ◽  
Turbine Blade ◽  
Wind Load ◽  
Composite Sandwich ◽  
Extreme Wind

Reliability model for wind turbine blade composites under alternate action of normal and extreme wind loads

2021 ◽  
pp. 095440622098200
Author(s):  
Jianxiong Gao ◽  
Yiping Yuan
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Residual Strength ◽  
Wind Load ◽  
Strength Degradation ◽  
Wind Turbine Blade ◽  
Wind Loads ◽  
Reliability Model ◽  
Dynamic Reliability ◽  
Extreme Wind

Wind turbine blade is the key component to capture wind power, and it is mainly composed of glass fiber reinforced polymer (GFRP). Due to the randomness and volatility of wind speed in nature, wind turbine blade is usually subjected to the alternate action of normal and extreme wind loads during its long-term service. In this study, a reliability model that considering the stochastic wind loads and strength degradation of GFRP is proposed. Firstly, a residual strength model is developed based on the Palmgren-Miner (P-M) damage theory and the same damage state (SDS) principle, which is capable of characterizing the strength degradation law of GFRP under the normal wind load. Then, the alternate actions of normal and extreme wind loads are considered, and a dynamic reliability model is presented based on Poisson process and mathematical derivation. Finally, the traditional discrete stress-strength interference (DSSI) model is extended to calculate the dynamic reliability when probability distributions of stochastic wind loads and residual strength of GFRP are unknown. The wind load data and GFRP test data are utilized to demonstrate the effectiveness of the proposed model. The result shows that the reliability of GFRP keeps at a high level in the early stage, then it rapidly decreases due to the accumulation of fatigue damage.

scholarly journals Failure Analysis in Lacing Wire Of Last Stage Low Pressure Steam Turbine Blade

2021 ◽  
Vol 1096 (1) ◽  
pp. 012097
Author(s):  
A M Kongkong ◽  
H Setiawan ◽  
J Miftahul ◽  
A R Laksana ◽  
I Djunaedi ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Steam Turbine ◽  
Turbine Blade ◽  
Low Pressure ◽  
Pressure Steam ◽  
Steam Turbine Blade ◽  
Last Stage

Wind Turbine Aerodynamic Braking System Analysis Using Chord Wise Spacing

2015 ◽  
Vol 787 ◽  
pp. 217-221 ◽  
Author(s):  
B. Navin Kumar ◽  
K.M. Parammasivam
Keyword(s):  
Renewable Energy ◽  
Wind Turbine ◽  
Wind Velocity ◽  
Turbine Blade ◽  
Wind Turbines ◽  
Renewable Energy Sources ◽  
Energy Resource ◽  
Braking System ◽  
Extreme Wind ◽  
Wind Potential

Wind energy is one of the most significant renewable energy sources in the world. It is the only promising renewable energy resource that only can satisfy the nation’s energy requirements over the growing demand for electricity. Wind turbines have been installed all over the wind potential areas to generate electricity. The wind turbines are designed to operate at a rated wind velocity. When the wind turbines are exposed to extreme wind velocities such as storm or hurricane, the wind turbine rotates at a higher speed that affects the structural stability of the entire system and may topple the system. Mechanical braking systems and Aerodynamic braking systems have been currently used to control the over speeding of the wind turbine at extreme wind velocity. As a novel approach, it is attempted to control the over speeding of the wind turbine by aerodynamic braking system by providing the chord wise spacing (opening). The turbine blade with chord wise spacing alters the pressure distribution over the turbine blade that brings down the rotational speed of the wind turbine within the allowable limit. In this approach, the over speeding of the wind turbine blades are effectively controlled without affecting the power production. In this paper the different parameters of the chord wise spacing such as position of the spacing, shape of the spacing, width of the spacing and impact on power generation are analyzed and the spacing parameters are experimentally optimized.

Failure analysis of the 350MW steam turbine blade root

2009 ◽  
Vol 16 (4) ◽  
pp. 1270-1281 ◽  
Author(s):  
J. Kubiak Sz ◽  
J.A. Segura ◽  
G. Gonzalez R ◽  
J.C. García ◽  
F. Sierra E ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Steam Turbine ◽  
Turbine Blade ◽  
Blade Root ◽  
Steam Turbine Blade

scholarly journals Non-Destructive Evaluation of Damage Mechanisms in Composite Sandwich Structure

2008 ◽  
Vol 13-14 ◽  
pp. 105-114
Author(s):  
Amit Puri ◽  
Alexander D. Fergusson ◽  
I. Palmer ◽  
Andrew Morris ◽  
F. Jensen ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Structural Integrity ◽  
Wind Turbine Blade ◽  
Image Correlation ◽  
Box Girder ◽  
Full Field ◽  
Composite Sandwich ◽  
Non Destructive ◽  
Dic Technique

This paper presents the experimental results obtained of flexurally loaded wind turbine blade cross section material. All material was extracted from a wind turbine blade box girder and testing was conducted in four point configuration. The aim was to gain an understanding of the structural integrity of this lightweight material as it deforms in flexure. To allow for thorough analysis, digital image correlation (DIC) was used to produce full field strain maps of the deforming specimens. Results highlight the capability of the DIC technique to identify regions of failure, as well as the aspects responsible for them. Overall, the results present a foundation for tests on larger substructure, and eventually integration into manufacturing and maintenance aspects of the industry.

Finite Element Approach for Failure Analysis of a Gas Turbine Blade

2018 ◽  
Vol 18 (5) ◽  
pp. 1210-1215 ◽  
Author(s):  
P. Balachandra Shetty ◽  
R. K. Mishra ◽  
S. S. Prithvi ◽  
R. Lohith ◽  
B. M. Karthik ◽  
...  
Keyword(s):  
Finite Element ◽  
Failure Analysis ◽  
Gas Turbine ◽  
Turbine Blade ◽  
Gas Turbine Blade ◽  
Finite Element Approach ◽  
Element Approach

Failure analysis of wind turbine blade under critical wind loads

2013 ◽  
Vol 27 ◽  
pp. 99-118 ◽  
Author(s):  
Jui-Sheng Chou ◽  
Chien-Kuo Chiu ◽  
I-Kui Huang ◽  
Kai-Ning Chi
Keyword(s):  
Failure Analysis ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Wind Loads
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