Analysis and Optimization of Rocker ARM

An article published in the «  International Journal of Engineering Science and Computing« , September 2017.

A rocker arm is a valve train component in internal combustion engines. As rocker arm is acted on by a camshaft lobe, it pushes and opens either the intake or exhaust valve. This allows fuel and air to be drawn into the combustion chamber during the intake stroke or exhaust gases to be expelled during the exhaust stroke. Rocker arms were first invented in the 19th century and have been changed a little in function since then. Improvements have been made, however, in both efficiencies of operation and construction materials. About Rocker arm of Tata Sumo, vista. They will make the exact design of rocker arm of Tata sumo …..Read more

Publicités

Erosion of glass fibre reinforced époxy composites

An article published on the JOURNAL OF THE EGYPTIAN SOCIETY OF TRIBOLOGY (VOLUME 14, No. 2, April 2017).

Sand erosion of epoxy resin reinforced by randomly distributed glass fibres and filled by synthetic, paraffin and glycerine oils is studied. The effect of inclination of impact angle and oil content contained in the matrix of epoxy resin is investigated. In addition, the electrostatic charge generated on the eroded surface is measured. Reinforced epoxy demonstrates low erosion resistance compared to unreinforced epoxy. SEM surface examination reveals the effect of inclination angle on wear. Specimens filled by oil lose the electrostatic charge generated from sand erosion in earlier time compared to the unfilled test specimen.

Read more

Care and Maintenance of Bearings

Une publication intéressante chez SNR (NTN Corporation) qui présente les différents cas de défaillance pouvant affecter des roulements.

Pour accéder au document cliquez ici

Et si vous rencontrez un problème de défaillance de roulement n’hésitez pas à contacter les experts du Cetim.  En confiant votre expertise au Cetim, centre technique indépendant et neutre, vous êtes assuré d’une approche objective, compétente et factuelle.
Ses équipes dédiées pratiquent l’analyse des défaillance au quotidien et s’engagent sur des diagnostics.
Savoir pourquoi est son cœur de métier.
Savoir quoi faire est son atout, pour que vous tiriez de cet événement une nouvelle force de compétitivité !
Le Cetim est leader français en analyse de défaillances mécaniques, enrichi de son expérience de 30 ans, de 1000 nouveaux cas traités par an dans tous les domaines de la mécanique.

Abrasive Wear Failure Analysis of Tungsten Carbide Hard facing on Carbon Steel Blade

This content has been downloaded from IOPscience, Series: Materials Science and Engineering 165 (2017),

This study investigate the abrasive wear failure of tungsten carbide hardfacing on continuous digester (CD) blade (carbon steel) in an environment of sulphuric acid and ilmenite ore mixture. Comparison being made on the hardness, thickness and microstructural of the hardfacing between unworn and 3 months old worn blade on few locations around the blade. The cross sections of the blade revealed non-uniform coverage of the hardfacing on the blade for both worn and unworn blade. The edge of the blade has the least amount of hardfacing thickness which with time acts as the point of failure during the wear process. The hardness obtained from both the unworn and worn samples are around 25% lower from the hardfacing electrode manufacturer’s hardness specification. Microstructural micrograph analysis of the hardfacing reveale

Read more

Failure Analysis of Internal Combustion Engine Valves: A Review

An article published in « International Journal of Innovative Research in Science, Engineering and Technology« , december 2012.

Those study focuses on different failure modes of internal combustion engine valves, failures due to fatigue at high temperature, high temperature effects on mechanical properties of materials, like hardness and yield strength; wear failure which is due to impact loading, and wear rate that depends on load and time. For the study of fatigue life, a combined S-N (max. stress v/s number of cycles) curve is prepared. Such a curve helps in comparing the fatigue failure for different materials at different high temperatures and may also assist the researchers in developing the valve materials with a prolonged life.

Read more

Failure analysis of Rocker liner used as a charging system of blast furnace

2016-12-08_10h04_01      2016-12-08_10h05_28

An article published in « Case Studies in Engineering Failure Analysis« , July 2013.

In this study, failure analysis of rocker liners used for charging system of blast furnace was carried out. The failed rocker liner samples shows non-uniform distribution of carbides, resulted in variation of hardness as well as wear properties. In the case of failed sample, the reason for the poor wear resistance of the component was due to the non-uniform carbide in pearlitic matrix.

Read more …

Failure investigations of a first stage Ni based super alloy gas turbine blade

2016-10-25_17h11_11A paper presented at the « International Conference on Processing of Materials, Mineral and Energy », 29th and 30th july 2016, PACE Institute of Technology & Sciences, India. It had been published by Elsevier.

This paper deals with the failure investigations of the first stage gas turbine blade of 30MW gas turbine. This blade is manufacture with of nickel based super alloy IN738. The main focus of the paper is to found the causes of failure of the blade. By the investigations, it is found that the blade failure takes place due to the combined effect of erosion, oxidation, overheating, and hot corrosion.

More at : http://www.pmme.co.in/papers/EMT-087.pdf

Root cause analysis (RCA) of fractured ASTM A53 carbon steel pipe at oil & gas company

2016-07-05_16h25_54

An article in progress in « Case Studies in Engineering Failure Analysis », Volume 7 (october 2016).

 

Incident involving failures of ASTM A53 carbon steel pipe, connected to pressure safety valve and carrying raw gas has caused serious supply disruption. This study was performed to identify the most probable cause of the pipe failure.

Read more

Modes of failure of cemented tungsten carbide tool bits : A study of wear parts

2016-04-18_22h29_00An article published in « International Journal of Refractory Metals and Hard Materials », july 2015.

Tungsten carbide alloyed with cobalt (WC/Co) shows unique characteristics like high strength at elevated temperature and high mechanical and chemical resistance that makes carbide tools appropriate for cutting, drilling, mining and machining operation. A whole failure study is revealed within the paper. This study also discusses the failure mode of a tungsten carbide tools, its prediction and remedies.

Read the paper

 

FAILURE ANALYSIS OF DRIVING MECHANISM IN HORIZONTAL PLANNING MACHINE

planing machineAn article published in « International Journal of Research and Innovation in Engineering Technology » (IJRIET), available online 26 February 2016.

In this paper the failure analysis and optimization of horizontal mechanism in a horizontal planning machine rack and pinion arrangement is needed for the translation movement. In general, wear occurring in V-Guides ways and drive mechanism are not equal. So that, the variation of the wear amount should affect the surface level of to be machined component. The failure is rectified to implement the new mechanism (arrangement) in driven portion of the horizontal mechanism.

Read more