RUSH: Realtime ultrasonic scanning using submergible hydraulic robotic arms for mechanical properties testing

2019 ◽  
Author(s):  
Mohammad Sadegh Saadatzi ◽  
Hossain Ahmed ◽  
Mustahseen Mobashwer Indaleeb ◽  
Sourav Banerjee
Keyword(s):  
Mechanical Properties ◽  
Robotic Arms ◽  
Ultrasonic Scanning ◽  
Mechanical Properties Testing

Piecing Failure Analysis of Drill Pipe Upset

2011 ◽  
Vol 314-316 ◽  
pp. 1210-1213
Author(s):  
Fang Po Li ◽  
Yong Gang Liu ◽  
Wang Yong
Keyword(s):  
Mechanical Properties ◽  
Fracture Surface ◽  
Failure Analysis ◽  
Surface Analysis ◽  
Drill Pipe ◽  
Fatigue Property ◽  
Forging Process ◽  
Result Show ◽  
Fracture Surface Analysis ◽  
Mechanical Properties Testing

The failure cause of Φ127mm G105 IEU drill pipe upset was investigated through mechanical properties testing, optical morphologies and fracture surface analysis. The result show that drill pipe upset’s failure reason is the elephant hide and decarburization layer in its out-surface caused by improper upset treatment in forging process. Elephant hide and decarburization layer existing in drill pipe upset changed seriously reduced its strength and fatigue property. Under the effect of alternating stresses, the crack first initiated from the deepest position of elephant hide and developed quickly. In the end, it leaded the drill pipe to early piecing failure.

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 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.

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