Archives mensuelles : septembre 2015

Failure analysis of edge discoloration of galvanized fuel tank

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An interesting case study of failure analysis of defect on the surface of some galvanized fuel tank will be published on October 2015 in Case Studies in Engineering Failure Analysis 

A peculiar type of edge discoloration defect on the surface of some galvanized fuel tank was observed, causing significant appearance problems. In the study, the surface defect was characterized by visual inspection, optical microscopy, scanning electron microscopy and energy dispersive spectroscopic analysis to understand the source and mechanism of the defect. The paper presents the results of the investigation.

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Anticiper les risques de blocage des galets

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Gimar Montaz Mautino a mis au point SecuRM, un nouveau système de sécurité qui contrôle en permanence la vitesse de rotation des galets qui supportent les câbles. Pour s’assurer que le système résisterait aux conditions climatiques extremes  en montagne, il fallait le testé en enceinte climatique. C’est la raison pour laquelle elle a contacté le Cetim.


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A failure analysis study on the packing cups of a hyper compressor

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An interesting case study of failure analysis of two packing cups failed by fatigue failure was published in Case Studies in Engineering Failure Analysis of June 2015

The packing cups of the second stage cylinders of the polyethylene hyper compressors failed after service life of about three months.

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Failure analysis of a motor-car coil spring

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An interesting case study of failure analysis of a motor-car coil spring broken was published in Case Studies in Engineering Failure Analysis on December 2013. A damage of protective layer was the reason for corrosion occurrence. A combination of corrosion and fatigue caused the failure of the spring.

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La simulation : un outil de compétitivité à portée des PMI

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La simulation est un sujet prioritaire et une voie d’avenir pour beaucoup de PME et de PMI mécaniciennes. Un dossier complet y est consacré dans Cetim Infos n° 230 de juin 2015. Un congrès sur le sujet spécialement dédié aux mécaniciens se tiendra le 13 octobre 2015 à Saint-Étienne.

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A failure analysis study on the fractured connecting bolts of a filter press

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An interesting case study of failure analysis will be published in Case Studies in Engineering Failure Analysis in October 2015

The purpose of this study was to investigate the main causes of the co-fracture of sixteen connecting bolts of a filter press cylinder–piston system. Stress state of the bolts during the service conditions has been analyzed and the failure reasons were determined from the fractography analysis and gathered information. According to the obtained results, it was concluded that the bolts had failed by the fatigue mechanism. It seems that insufficient torque was used during assembly.

Read more at : A failure analysis study on the fractured connecting bolts of a filter press

Failure Analysis of a Polymer Centrifugal Impeller

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An other new case study of failure analysis had been published in october 2015 in Case Studies in Engineering Failure Analysis.

A failure analysis investigation was performed on a fractured polymer impeller used in a respiratory blower. A radial split down the impeller center was observed, with symmetric fracture faces about the impeller bore. The brittle fracture morphology and defects within the impeller bore suggest that premature failure occurred because of multiple interacting factors including: intermittently high centrifugal velocities, imbalance bore and shaft conditions, defects within the bore caused by machining, and stress concentrations along the circumference of the impeller lip.

Read more at : Failure Analysis of a Polymer Centrifugal Impeller.

Leg Weld Fatigue Cracks in Anhydrous Ammonia Nurse Tanks

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A new case study of failure analysis was published on  Case Studies in Engineering Failure Analysis, april 2015

In an accident in southwest Iowa, USA in 2012, an anhydrous ammonia nurse tank vented its entire cargo of 5500 liters (1500 gallons) of liquid ammonia to the atmosphere. Follow-up study of the failed tank revealed a through-crack along a weld used to connect the tank to its running gear. The authors recommend that side-angle ultrasound be considered for use in periodic nurse tank inspections.

via Leg Weld Fatigue Cracks in Anhydrous Ammonia Nurse Tanks.

Journées internationales francophones de tribologie : 27 au 29 mai 2015

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Plusieurs communications d’importance ont été faites lors des Journées internationales francophones de tribologie (JIFT), qui se sont tenues du 27 au 29 mai 2015 à Bouguenais, sur le site nantais de l’Institut français des sciences et technologies des transports, de l’aménagement et des réseaux (Ifsttar).

Les experts du Cetim étaient présents, ils ont rédigé une note de veille sur ces journées.

Retrouvez les détails de cette note de veille en accès libre sur cetim.fr. Pour y accéder devenez membre de notre site. C’est gratuit ! L’ensemble des notes de veille est disponible sur cetim.fr, rubrique « Mécathèque ».

Lire l’article : Journées internationales francophones de tribologie : frottement, lubrification et usure font débat – Cetim.