scholarly journals Analysis and Research on the Cause of Wind Turbine Blade Bolt Fracture

2021 ◽  
Vol 2133 (1) ◽  
pp. 012028
Author(s):  
Feng Yun ◽  
Jun Liu ◽  
Chunyu Liu ◽  
Xiaochun Zhao
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Stress Concentration ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Farm ◽  
Composition Analysis ◽  
Chemical Composition Analysis ◽  
Mechanical Properties Testing ◽  
Load Impact

Abstract In 2019, inspection personnel of a wind farm went to the tower and found that a total of 6 bolts of blades in the hub of a wind turbine had broken and failed. In order to find out the cause of fracture, the fracture bolt was comprehensively detected and analyzed by means of appearance morphology analysis, chemical composition analysis, mechanical properties testing, microstructure testing and fracture micro-area analysis. The results show that the main reasons for the bolt fracture are as follows: under the action of the bolt’s constantly changing and repeated wind load impact and the alternating load caused by blade rotation during the operation of the fan, the crack source is formed along the bottom of the thread with serious stress concentration and expands in fatigue mode until the whole fracture fails.

Fracture Failure Analysis of N80 Q Marine Casing

2013 ◽  
Vol 318 ◽  
pp. 331-335
Author(s):  
Hong Zhang ◽  
Quan Luo ◽  
Xu Hui Liu ◽  
Peng Wang ◽  
Ding Feng
Keyword(s):  
Mechanical Properties ◽  
Fracture Analysis ◽  
Metallographic Analysis ◽  
Composition Analysis ◽  
Service Environment ◽  
Fracture Failure ◽  
Completion Process ◽  
Casing Pipe ◽  
Chemical Composition Analysis ◽  
Mechanical Properties Testing

The 13-3/8〞casing of a well was bent down and broken off in the marine development completion process. The cause for the fracture is systematically analyzed by means of chemical composition analysis, mechanical properties testing, macro and micro fracture analysis and metallographic analysis. The results indicate that, the heterogeneity of the casing material and large oxide metallurgical inclusions found in fracture place severely reduce the properties of the material, which lead to the failure of casing pipe in bad service environment.

Failure Analysis of Hot Clamp Induced Cracking on Hydrogen Reformer Outlet Pigtail Tubes

2019 ◽  
Vol 795 ◽  
pp. 340-345
Author(s):  
Luo Wei Cao ◽  
Guo Shan Xie ◽  
Min Zhen Zhao
Keyword(s):  
Mechanical Properties ◽  
Failure Analysis ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Composition Analysis ◽  
Impurity Atoms ◽  
Chemical Composition Analysis ◽  
Mechanical Properties Testing ◽  
Metallurgical Evaluation ◽  
Reformer Tube

Failure analysis of the hot clamped outlet pigtail tubes connected with hydrogen reformer tube in refineries has been carried out. In this paper, hot clamp induced cracking on Incoloy 800HT outlet pigtail tube of a reformer unit is studied by microscopic observation and mechanical properties testing. Metallurgical evaluation and chemical composition analysis have been performed on both hot clamped cracking tube and no cracking one. Results indicated that the most important parameter affecting the high temperature brittleness of pigtails are the Ni/Cr value, surface grain size and impurity atoms grain boundary segregation.

scholarly journals Production of sinters from commercial powder mixtures for a matrix of diamond impregnated tools

Mechanik ◽  
2017 ◽  
Vol 90 (1) ◽  
pp. 54-55
Author(s):  
Joanna Borowiecka-Jamrozek ◽  
Jan Lachowski
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Composition Analysis ◽  
Powder Mixtures ◽  
Chemical Composition Analysis ◽  
Iron Based ◽  
Commercial Iron ◽  
Size Powder ◽  
Scanning Electron

The paper presents the results of analyzing mechanical properties of the sinters obtained from the commercial iron-based powder mixtures. Parameters mechanic, plastic and density, hardness and porosity of the sinters were determined. The sinters microstructure and the chemical composition analysis were carried out by using the scanning electron microscope. The results were compared with the properties of the sinters obtained from the cobalt SMS (submicron size) powder.

scholarly journals Correction: Yu, D.Q., et al. Microscopic Characteristic and Chemical Composition Analysis of Three Medicinal Plants and Surface Frosts. Molecules 2019, 24, 4548

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 379
Author(s):  
Da Qing Yu ◽  
Xiao Jing Han ◽  
Ting Yu Shan ◽  
Rui Xu ◽  
Jin Hu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Medicinal Plants ◽  
Composition Analysis ◽  
Microscopic Characteristic ◽  
Chemical Composition Analysis

The authors would like to correct an error in the title paper [...]

Chemical composition analysis of carbohydrate fragmentation products

2021 ◽  
Vol 156 ◽  
pp. 105112
Author(s):  
Samin Fathalinejad ◽  
Esben Taarning ◽  
Peter Christensen ◽  
Jan H. Christensen
Keyword(s):  
Chemical Composition ◽  
Composition Analysis ◽  
Chemical Composition Analysis

Research on Process Mineralogy of Potassium-Rich Shale

2010 ◽  
Vol 158 ◽  
pp. 197-203 ◽  
Author(s):  
Jie Liu ◽  
Yue Xin Han ◽  
Wan Zhong Yin
Keyword(s):  
Chemical Composition ◽  
Mineral Composition ◽  
Potassium Feldspar ◽  
Composition Analysis ◽  
Research Results ◽  
Dsc Analyses ◽  
Process Mineralogy ◽  
Mineral Compositions ◽  
Chemical Composition Analysis

The process mineralogy of potassium-rich shale from Chaoyang of Liaoning, China, was studied. Research results showed there are much less variety and smaller quantities in mineral compositions. Calculated mineral composition by means of chemical composition analysis combined with XRD, MLA, IR and TG-DSC analyses showed that main minerals with were Potassium-feldspar, muscovite, biotite and illite, and gangue minerals were quartz and small amounts of hematite. Potassium-rich minerals such as potassium-feldspar and muscovite contact smoothly with quartz respectively, and there was the direction arrangement among potassium-feldspar, quartz and muscovite in the shale. And quartz and hematite were main cement in the shale. The influences of the research results on the potassium extraction from potassium-rich shale were distinct.

scholarly journals Chemical composition analysis of the essential oil of Solanumn nigrum L. by HS/SPME method and calculation of the biochemical coefficients of the components

2017 ◽  
Vol 10 ◽  
pp. S2372-S2375 ◽  
Author(s):  
Avat (Arman) Taherpour ◽  
Mohammad Mehdi Khodaei ◽  
Baram Ahmed Hama Ameen ◽  
Majid Ghaitouli ◽  
Nosratollah Mahdizadeh ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Composition Analysis ◽  
Chemical Composition Analysis

Comparison of machine learning techniques to optimize the analysis of plutonium surrogate material via a portable LIBS device

2021 ◽  
Author(s):  
Ashwin P. Rao ◽  
Phillip R. Jenkins ◽  
John D. Auxier II ◽  
Michael B. Shattan
Keyword(s):  
Machine Learning ◽  
Chemical Composition ◽  
Machine Learning Techniques ◽  
Composition Analysis ◽  
Learning Techniques ◽  
Chemical Composition Analysis

Enhancing the analytical capabilities of a hand-held LIBS device for chemical composition analysis of a plutonium surrogate using different machine learning paradigms.

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