Archives du mot-clef Cracks

Reduction in diversion due to coil break in CRNO grades of coils

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

This paper reports investigations after diversion due to coil break in cold rolled non oriented (CRNO) grades of coils showed an increasing trend during Jan–May’12 at Silicon Steel Mill (SSM), Rourkela Steel Plant (RSP). Coil break increased from a level of less than 1% during to a level of 30% in May’12. Samples from hot rolled coils and finished coils were taken and detailed metallurgical investigation was carried out to ascertain the genesis of such defects. Further studies were carried out in the processing lines and material flow was tracked from steel making to final product. The probable reasons were identified and corrective measures were taken leading to reduction in diversion due to coil break less than 2%.

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Failure analysis of a vibration isolator used in launch vehicle applications

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A new paper published in « Case study in Engineering Failure Analysis »  on ScienceDirect.com.

Vibration isolators are used in launch vehicles to protect sensitive electronic equipments from the rigors of flight structural vibrations during the lift-off and ascent phase. Failure of one such vibration isolator made of AISI 304 is reported in the present study after ground level testing has been completed.  Finally, it was concluded that micro cracks formed during the deep drawing operation due to large strains at the fore end corner propagated during vibration testing resulting in the failure of the body of the vibration isolator.

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Probable cause analysis of cracks observed on vertical centrifugal pump

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Un nouvel article publié via ScienceDirect.com dans Engineering Failure Analysis – Probable cause analysis of cracks observed on vertical centrifugal pump.

Deux pompes centrifuges verticales identiques sont utilisées pour refroidir le matériel utilisé pour la production d’électricité à cycle combiné. L’une de ces deux pompes s’est fendue au niveau d’un coude, à la différence de la seconde qui, bien qu’opérant dans les mêmes conditions, ne présente aucune anomalie.

La simulation numérique de l’écoulement dans une pompe centrifuge verticale a permisconclure que la brusque fermeture de la soupape est la cause la plus probable des fissures sur l’une des deux pompes.