The Failure Analysis and Simulation of an ABS Extrusion Die

2016-04-18_23h25_24A paper published in « Procedia Engineering » and available on ScienceDirect.

Coat-hanger dies are widely used in the extrusion of plate and sheet, since it can achieve uniform velocity attribution on the outlet according to balancing the distribution of flow through the die. A failure ABS extrusion die of a petrochemical company is studied in this paper. The results show that the pressure drop in the die exceed the maximum allowable value, which is the main cause of die failure, in addition to the exceeded pressure drop the fluctuation of the velocity on the outlet is too large, which would lead to poor quality of product. The work in the paper provides guidance for the future die design and optimization.

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Publicités

Effect of Heat Treatments on Fatigue Failure and Fracture Toughness of Various Tool Steels

IJCETA paper published in « International Journal of Current Engineering and Technology » and available on International Press Corporation.

This paper present the state of the art review on the effect of the various heat treatments on fatigue strength and fracture toughness of the different tool steels. The different researchers used the experimental tests like thermal fatigue test, thermo-mechanical fatigue (TMF) test for calculation of fatigue strength and threepoint bend tests for fracture toughness of the tool steels.

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Failure Analysis of a Reactor after Explosion Accident

2016-04-18_23h00_19A paper published in « Procedia Engineering« , Volume 130, 2015.

Burst of a reactor occurred in an explosion accident during the production of antistatic agent process. According to the results of site survey, the current regulations and standards as well as the requirements of the accident investigation group, the reason of burst was discussed by failure analysis of the shell and bolts.

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Development of banded microstructure in 34CrNiMo6 steel

2016-04-18_22h49_18

A paper published in « METALURGIJA 55″ (2016) 3, 329-332

In this paper the development of a banded microstructure in hot-rolled 34CrNiMo6 steel which consisted of bainitic  and martensitic bands is explained. The continuous
cooling transformation (CCT) diagrams of steel were calculated. They confirmed the formation of martensite in  positive segregations and the formation of bainite in negative ségrégations.

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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.

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PVD CrN-coated die for aluminy hot extrusion

2016-04-18_22h16_19The study shows that considerable reserves still exist for increasing the service times of CrN-coated  dies for Al hot extrusion. The main reasons for the decreased service times are revealed and explained regarding  the selected CrN-coated die for hot extrusion, i.e. why the service time of the coated-die is not in accordance with  the wear resistance of the CrN-coating. The shaping of the bearing surface and presence of the scratches, size and  amount of nonmetalic inclusions in the die steel, nodular defects in the CrN-coating, as well as thicknesses uniformity  of CrN-coatings along the bearing surface, are relevant influential parameters.

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Cinétique de fissuration sous chargements complexes

EDF_Img_DetailReferenceL’étude expérimentale confiée par EDF au Cetim a eu pour objectif de déterminer l’influence du mode de chargement sur la vitesse de propagation en fatigue de fissures transverses circonférentielles et d’évaluer les éventuels effets d’échelle.

Pour en savoir plus, lire le document.

Les compétences du Cetim s’expriment à travers sa capacité à maîtriser l’ensemble des technologies mécaniques. Les cas qui sont présentées ici exposent des exemples de réalisations menées pour ses clients tant à titre collectif qu’à titre individuel. Elles témoignent de la capacité du Cetim à proposer une offre globale et personnalisée de prestations autant pour les grands donneurs d’ordre que pour les petites entreprises.

Fracture analysis of U71Mn rail flash-butt welding joint

An other case study published in « Case Studies in Engineering Failure Analysis« , october 2015.

This paper mainly investigates the fracture problem of U71Mn rail flash-butt welding joint. The analysis results show that the welding joint is fatigue fracture, and the fracture surface morphology is the cleavage fracture characteristics.

Source : Fracture analysis of U71Mn rail flash-butt welding joint

Des soupapes zéro défaut avec Cetim-Trius

H-ValvesComme TOTAL, La société H+ Valves contrôle les pièces brutes en acier au carbone livrées par ses sous‑traitants grâce à Cetim-Trius.

Objectif : éliminer systématiquement les pièces qui ne présentent pas un traitement thermique conforme.

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Plastiques et composites, faites les bons choix pour innover – 23 mai à Hésingue (68)

2016-03-31_09h00_13A ne pas manquer, un Rendez-vous de la Mécanique organisé par le Cetim et la FIM.

La réunion d’information se tiendra le lundi 23 mai 2016 de 14 h 30 à 19 h 00, chez EMI, 3 rue de Nancy, à Hésingue (68).

Pour faire les bons choix : Vérifier les caractéristiques Eviter les principales défaillances Estimer la durée de vie du matériau … Et innover sans risque.

Voir le programme

RDV Mecanique