Failure analysis of piano strings

A new interesting paper in  » Engineering Failure Analysis » published on ScienceDirect.com.

This paper studies the failure cause of two types of piano strings. Were taken into consideration bass and acute strings of a grand piano concert broken up. The mechanisms leading to rupture the strings are examined. The critical points studied are : tuning pin, agraffe, compression points, environment, tuner.

Read more at : Failure analysis of piano strings.

Publicités

Failure analysis of a pressure vessel

A  « Case Studies in E
ngineering Failure Analysis
 » published on ScienceDirect.com.

High strength low alloy (HSLA) steel with a nominal composition of 0.15C–1.25Cr–1Mo–0.25V is being extensively used in space programme. Owing to its ease of fabrication and welding, a tank was fabricated out of this alloy. The tank is used to contain strontium per chlorate which on combustion develop secondary thrust, effectively used during attitude control of satellite launch vehicle. During one of the routine qualification tests, a tank had failed at an internal pressure of 109 bar, against a designed proof pressure of 120 bar.

Failure was initiated from long seam weld of a cylindrical shell and propagated into the parent material thereafter. Detailed metallurgical investigation has been carried out to understand the cause of failure. …..Read more

Catastrophic failure of a carbon steel storage tank

A  « Case Studies in Engineering Failure Analysis » published on ScienceDirect.com

Catastrophic failure due to internal corrosion of a 10 m high, 8 m diameter steel storage tank containing approximately 350 m3 of waste solvent led to a significant environmental incident in 2009. An investigation was carried out to establish the root cause and to learn lessons that might prevent a reoccurrence.

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Failure of the Chassis of Roller Skates for Figure Skating

An interesting  paper in « Case study in Engineering Failure Analysis » published on ScienceDirect.com. This paper dealt with the analysis of a novel chassis for figure roller skates, made of P-AlMgSi alloy, which experienced a premature failure. An integrated approach had to be used to overcome the several criticalities of the study. The research led to the individuation of the primary cause of failure, standing in bending fatigue, due to the high number of jumps (i.e.: fatigue cycles) being performed during figure skating training. A solution to the problem was suggested, which led to an improved and optimized project of the chassis with positive outcomes (from the technical and mechanical points of view) in its use.

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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

UNE COMPLÉMENTARITÉ ENTRE ESSAIS ET CERTIFICATION

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.