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


Progressive Damage and Failure Analysis of Composite Laminates

Here is an interesting dissertation found on Web.

Computational modeling of composite laminates for assessing stiffness and strength is a subject of contemporary interest to airframe manufacturers, such as the Boeing company. Progressive damage and failure analysis of composite laminates is complex and developing a robust computational model is the subject of this dissertation. The finite element (FE) method and computational studies using FE are mainstays in
structural analysis and design. Virtual testing is a subject where the requirements of carrying out several laboratory tests can be partially replaced through validated computational models so that the number of laboratory tests and hence costs associated with the tests, can be reduced without sacrificing accuracy.

Read this dissertation


Catalogue formations 2018 : relevez les défis de demain !

Le catalogue formations 2018 du Cetim est disponible. Une offre regroupant 350 formations métiers déclinée en filières, dont une dédiée à l’industrie du futur avec notamment ses nouvelles technologies de fabrication additive, de robotisation ou de contrôle non destructif.

En 2018, le Cetim revoit complètement son offre de formations. Son objectif : coller toujours plus à la réalité des entreprises et aux évolutions technologiques et normatives dans lesquelles le monde industriel est engagé. Ainsi, c’est dans un nouveau format décliné en filières que le catalogue Formations 2018 présente les 350 formations métiers, animées partout en France, permettant aux ingénieurs et techniciens d’approfondir leurs connaissances dans un domaine de la mécanique.

Accéder au catalogue 2018


Organisme de certification spécialisé dans le domaine maritime, Lloyd’s Register intervient dans la validation des pièces et matériaux utilisés sur les navires. Lors de ces vérifications, il s’appuie sur les experts du Cetim pour conduire les essais. …..Lire l’article

Fatigue Failure of wheel studs and nuits of light vehicules

Light vehicle is a potentially useful and efficient mode of transportation to be utilized in supporting the coal mine operation. However, due to the harsh road condition at the mine site, many light vehicles presently used are frequently experiencing a number of incidents caused by loose wheel. The occurrence of this loose wheel is very much related with some broken or damaged wheel studs and/or nuts of the vehicle. Type of failure and factors that may have caused the damage of the wheel studs and/or nuts of the vehicles are discussed in this paper…….

Read the  paper published on « Metalurgi »

Le Cetim-Cermat fête ses 40 ans

Le centre associé au Cetim dans le Grand-Est souffle ses 40 bougies le 6 octobre 2017 à Mulhouse. L’occasion pour les participants de découvrir ses installations, ses savoir-faire et d’inaugurer sa nouvelle plateforme d’expérimentation R&D et de démonstration « matériaux composites et recyclage ».

Créé en 1977, le centre régional d’innovation et de transfert de technologie (CRITT) Cetim-Cermat, centre associé au Cetim, est labellisé centre de ressources technologiques (CRT) en mécanique avancée et membre de l’institut Carnot Mica.
Retrouvez plus d’information sur l’antenne de Metz du Centre sur notre site, rubrique « Actualité », et sur le site Internet du Cetim-Cermat.

Fault tree analysis of failure cause of crushing plant and mixing bed hall at Khoy cement factory in Iran

A paper published un « Case Studies ni Engineering Failure Analysis », april 2014.

Evaluating and analyzing the risk in the mining industry is a new approach for improving the machinery performance. We use fault tree analysis for modeling occurrence of undesired events (failures) in cement factory. In this model, The authors use fault tree analysis for modeling occurrence of undesired events (failures) in cement factory. They focused on crushing and mixing bed hall department. Analysis of case study extended to system and subsystem levels for each department.

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Investigation on brittle fracture mechanism of a grade E cast steel knuckle

A paper published on « Case Studies in Ingineering Failure Analysis », on april 2014.

This paper investigated the brittle fracture mechanism of a grade E cast steel knuckle that is one of the key components of the coupler for railway wagon. The fracture morphology mainly shows the characteristic of cleavage, quasi-cleavage fracture as well as a little ductile fracture, so the failure of the knuckle can be attributed to brittle fracture distinctly. Moreover, a welding repair area with high hardness is also found in the fracture region, which might initiate micro-cracks on the surface of the knuckle. As a result, it can be inferred that under an impact load that did not exceed material fracture limit, the micro-cracks initiated from weld repair zone propagated rapidly into the inner matrix by continuously fracturing the dendrites along shrinkage porosity regions until the knuckle failed instantly.

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The Challenger Disaster Report

In this essay, we will make a thorough study of the technical and administrative factors that contributed to the failure of the Shuttle Challenger project. Starting from paying attention from the planning stage, the implementation of the project, and even the consequences and further investigations, to be able to identify the lessons to be learned in both areas. It is expected that by completing this task, we can notice the critical factors that we need to pay particular attention to approaching ourselves as students that can develop projects successfully.

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Pitting corrosion failure analysis of a wet gas pipeline

This paper, published on Engineering Failure Analysis, august 2017, présents corrosion failure analysis of an underground natural gas pipeline. The pipeline material grade is API 5L X65 with 10-in ID. The pipeline transfers multiphase fluid (gas, condensate, and water) from a gas well to a gas gathering plant, located 4200 m away from the well site. A portion of the line failed due to pitting corrosion under unknown circumstances. Based on visual and microscopic analyses and reviewing the background information, the following pitting corrosion sequences were identified: the oversized pipeline changed the dominant flow regime to “stratified”. In the stratified flow regime, the accompanying water phase accumulated in the pipelines’ low points. Considerable concentration of calcium ions along with high pH in CO2 media favored precipitation of calcium carbonate. The relatively thick scales adhered to the pipe surface were partially loosened and removed by the regional turbulent flow. This exposed the fresh steel surface to the corrosive media. The uncovered areas acted as the preferential anodic sites coupled with nearby large cathodic sites which were covered by scales and/or corrosion products. Under such conditions, pits emerged on the steel surface until one of them grew faster and failed the gas pipeline.

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