Fault Analysis on Crosshead Fracture of the Reciprocating Piston Compressor C102B

2011 ◽  
Vol 189-193 ◽  
pp. 1188-1193
Author(s):  
Ya Xin Zhang ◽  
Li Juan Chen ◽  
Bin Bin Li
Keyword(s):  
Stress Analysis ◽  
Structure Analysis ◽  
Piston Compressor ◽  
Maximum Load ◽  
Fault Analysis ◽  
Dynamics Analysis ◽  
Methanol Production ◽  
Metallographic Structure

The C102B reciprocating piston compressor is an important equipment widely used in methanol production. Because of the complexity of exact dynamics analysis, the traditional and common way to find the reason of fracture is only based on metallographic structure analysis of crosshead material. In this paper, after metallographic structure analysis of crosshead material of the C102B compressor, the maximum loads on it are also calculated and two dangerous crosshead positions with maximum load are determined. Finally, stress analysis of the crosshead in two dangerous positions is implemented by FEM technology. Based on the above study, the reasons of crosshead fracture of the C102B compressor are found. The results has an inportant significance for judging the resaon of crosshead failure.

Stress Analysis of the Impactor Assembly of the Dropped Weight Impact Testing Machine

2014 ◽  
Vol 660 ◽  
pp. 567-571 ◽  
Author(s):  
Nguyen Van Trong ◽  
Leonardo Gunawan ◽  
Annisa Jusuf ◽  
Tatacipta Dirgantara ◽  
Ichsan Setya Putra
Keyword(s):  
Finite Element Analysis ◽  
Stress Analysis ◽  
Testing Machine ◽  
Maximum Load ◽  
Impact Testing ◽  
Element Analysis ◽  
Impact Testing Machine ◽  
Load Limit ◽  
Weight Impact ◽  
The Impact

This paper presents the stress analysis of an impactor assembly of a dropped weight impact testing machine. A finite element analysis was performed to calculate the stress occurred on the impactor during the impact which should be less than its yield strength. By varying the level of the reaction load from the specimen to the impactor, the maximum load that can be withstand by the impactor assembly without plastic deformation was predicted. Then, several simulations were carried out to find the best way to increase the load limit of the impactor. It was found out that increasing the thickness of box to 7 mm and both the diameter of arm and frame-column to 40 mm will increase the load limit by 236%.

scholarly journals Failure Analysis and Protection of Oxygen Corrosion of Reheater Tube in a Power plant

2021 ◽  
Vol 261 ◽  
pp. 02027
Author(s):  
Chao Yang ◽  
Xiuneng Li ◽  
Yunan Wang ◽  
Mingcheng Sun
Keyword(s):  
Mechanical Properties ◽  
Power Plant ◽  
Failure Analysis ◽  
Structure Analysis ◽  
Alloy Composition ◽  
Tube Wall ◽  
Comprehensive Analysis ◽  
Composition Analysis ◽  
Oxide Composition ◽  
Metallographic Structure

The failure analysis of reheater tubes were analyzed by means of alloy composition analysis, metallographic structure analysis, mechanical properties analysis and oxide composition analysis. The results showed: The alloy composition meets the requirements of 12Cr1MoV standard. No abnormality was observed in metallographic structure. Mechanical properties qualified. Oxide components are mainly O and Fe. Comprehensive analysis shows that The main reason of reheater tube failure is oxygen corrosion, which caused thinning of the reheater tube wall, leading to leakage accident. Suggestions for subsequent protection are put forward.

Preventive Suggestion and Fault Analysis on Piston Fracture of the Methanol Fresh Air Compressor C102B

2011 ◽  
Vol 462-463 ◽  
pp. 1085-1091
Author(s):  
Ya Xin Zhang ◽  
Chao Bie ◽  
Fen Cheng ◽  
Zhi Zhong Su ◽  
Mamtimin Gheni
Keyword(s):  
Failure Rate ◽  
Piston Compressor ◽  
Fault Analysis ◽  
Exact Calculation ◽  
High Failure Rate ◽  
Air Compressor ◽  
D Model

The piston is a key moving-part of the reciprocating piston compressor with a high failure rate. Because of the difficult exact calculation of machinery dynamic, the traditional and common way to find the reason of fracture is based on metal-lographic phase of piston material. The C102B reciprocating piston compressor is an important equipment in methanol plant. In this paper, in connection with the piston fracture of the C102B fresh air compressor on service , besides a lot of analysis on metal-lographic phase, the 3-D model of piston and cylinder were built-up, and the two dangerous places where the piston suffered max-force were found. Bases on ANSYS and FEM technology, the value of max-force on piston at the two places were carried out. Finally, the reasons of piston fracture of the C102B fresh air compressor were found and some preventive suggestion was proposed.

Stress Analysis of Composite Aircraft Wing using Coupled Fluid-Structural Analysis

CFD Letters ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 78-86
Author(s):  
Jaffar Syed Mohamed Ali ◽  
Shahzatul Sakinah Binti Haron
Keyword(s):  
Structural Analysis ◽  
Pressure Distribution ◽  
Stress Analysis ◽  
Structure Analysis ◽  
Composite Structures ◽  
Weight Ratio ◽  
Aerodynamic Load ◽  
Fluid Structure ◽  
Aircraft Wings ◽  
Strength And Stiffness

Aircraft wings are designed with very low factor of safety to keep the aircraft weight minimum. Thus, for safe design of wings, stress analysis should be carried out under accurately estimated aerodynamic loads and this can be achieved only through coupled fluid-structure analysis. Moreover, modern aircraft wings are made of laminated composite structures and thus the purpose of this study is to employ ANSYS coupled fluid-structure analysis to find the best layup of composite wing of an aircraft that results in higher specific strength and specific stiffness. Firstly, Computational Fluid Dynamics (CFD) analysis has been carried out to find the actual aerodynamic load which is the pressure distribution around a three-dimensional wing. Then, this pressure distribution from CFD was used as a load input for detailed static structural analysis of the wing. Initially, strength and stiffness of an isotropic wing is evaluated and then the material of the wing was changed to composite laminates to achieve better structural performance with higher strength and stiffness to weight ratio. Stress analysis was carried out for different layups to predict the optimum layup that results in high strength and stiffness coupled with the least weight and it was found that the wing made of symmetric cross-ply laminate performs the best.

Miniature Electric Touring Car Chassis Structure Analysis and Optimization

2013 ◽  
Vol 791-793 ◽  
pp. 639-642
Author(s):  
Wei Min Liu ◽  
Chun Guang Lu ◽  
Hao Deng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Analysis ◽  
Structure Analysis ◽  
Element Analysis ◽  
Driving Condition

We finished the miniature electric touring car chassis structure finite element analysis. Mainly for the miniature electric touring car chassis uniform rectilinear driving condition, the distribution of deformation and stress analysis, According to the above data to optimize the chassis structure, and verified the rationality.

200kv superconducting cryo electron microscope

1987 ◽  
Vol 45 ◽  
pp. 642-643
Author(s):  
M. Iwatsuki ◽  
Y. Kokubo ◽  
Y. Harada ◽  
J. Lehman
Keyword(s):  
Electron Microscope ◽  
Structure Analysis ◽  
Organic Materials ◽  
Strong Interactions ◽  
Specimen Preparation ◽  
Great Effort ◽  
Electron Microscopic ◽  
Crystal Fields ◽  
Special Skill ◽  
Long Time

In recent years, the electron microscope has been significantly improved in resolution and we can obtain routinely atomic-level high resolution images without any special skill. With this improvement, the structure analysis of organic materials has become one of the interesting targets in the biological and polymer crystal fields.Up to now, X-ray structure analysis has been mainly used for such materials. With this method, however, great effort and a long time are required for specimen preparation because of the need for larger crystals. This method can analyze average crystal structure but is insufficient for interpreting it on the atomic or molecular level. The electron microscopic method for organic materials has not only the advantage of specimen preparation but also the capability of providing various information from extremely small specimen regions, using strong interactions between electrons and the substance. On the other hand, however, this strong interaction has a big disadvantage in high radiation damage.

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