Archives du mot-clef failure

Failure Analysis of Internal Combustion Engine Valves: A Review

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An article published in « International Journal of Innovative Research in Science, Engineering and Technology« , december 2012.

Those study focuses on different failure modes of internal combustion engine valves, failures due to fatigue at high temperature, high temperature effects on mechanical properties of materials, like hardness and yield strength; wear failure which is due to impact loading, and wear rate that depends on load and time. For the study of fatigue life, a combined S-N (max. stress v/s number of cycles) curve is prepared. Such a curve helps in comparing the fatigue failure for different materials at different high temperatures and may also assist the researchers in developing the valve materials with a prolonged life.

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Catastrophic failure of a carbon steel storage tank due to internal corrosion

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A paper published in « Case Studies in Engineering Failure Analysis« , available on sciencedirect.com.

Catastrophic failure 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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Corrosion of Welded Joint in Alloy Steel Pipe

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2015-11-15_10h33_54An interesting article published on 4 November 2015 in the International Journal of ELECTROCHEMICAL SCIENCE.

In this paper an investigation on corrosion behaviour of welded joints was performed to facilitate determination the causes of preferential degradation by corrosion of the welded metal (WM) and the heat affected zone (HAZ), in a welded pipeline of grade ASTM A355P5, used in a petrochemical plant as transfer line between a thermal cracking heater and a column which are part of an atmospheric distillation and vacuum (DAV) unit. It was found that the corrosion of the weld analyzed in this research has resulted due to its dendritic structure (pearlite, ferrite, complex carbide, bainite and martensite in localized areas), which reveals the lack of post welding heat treatment (PWHT). Read more …..

 

Catastrophic failure of a carbon steel storage tank due to internal corrosion

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A case study of failure analysis published in « Case Studies in Engineering Failure Analysis« , october 2013.

Catastrophic failure 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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Modes of failure of cemented tungsten carbide tool bits : A study of wear parts

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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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Failure analysis of the pulleys during the press-fit assembling process

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A case study published in « Case Studies in Engineering Failure Analysis« .

This article highlights failure investigation of the pulleys during a press-fit assembling process. Pulleys are used to transmit power between rotational mechanical elements. Failure analysis was found that cooperative influence of higher carbon content with combination of elongated sulphides is reason for pulleys cracking. Steel cleanliness and homogeneous structure is an important factor for users of steel. The success of production process is connected with the optimal quality of steel.

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Use of Aerospace Fasteners in Mechanical and Structural Applications

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Hugh Magma lockUn article paru dans «  Annals of Materials Science & Engineering« , publié sur www.austinpublishinggroup.com

Abstract. The intention of the present short review is to introduce to the non-specialist reader the feasibility of the use of alternative materials not generally considered by engineers working in mechanical and structural applications. That is, the use of specialised aerospace rivets in the more general area of construction is considered. To this end, the text briefly overviews the different types of fasteners used in the construction industry and their common mechanisms of failure.

Une proportion importante des défaillances mécaniques sont liées à des problèmes d’assemblage. Vissage, soudage, rivetage, collage… aucun type n’est épargné.

Le Cetim traite pour sa part, plus d’une centaine de cas d’analyses de défaillance liés à cette problématique par an.

Erreurs de conception, problèmes de procédés ou de mise en œuvre d’assemblage, défauts de matière, sont autant de pistes à explorer pour identifier et localiser les origines du problème. Des solutions correctives et pérennes appropriées sont ensuite proposées et mises en œuvre. Les experts du Cetim se tiennent à votre disposition pour vous apporter conseils et expertises dans cette problématique. N’hésitez pas à les contacter : cliquez ici.

 

Failure Analysis of Off-axis Crushing of Stitched Composite Absorbers

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crush boxDespite extensive investigations on the energy absorbing capabilities of fibre reinforced polymer (FRP) composite absorbers under axial loading, the off-axis crashworthy behaviour of composite absorbers remains unknown. In the present paper, published by School Aerospace & Aircraft Engineering-Kingston University- London,   the effects of stitching on the crack growth resistance, energy absorption and also off-axis crashworthy behaviour of CFRP composite box sections will be studied. The analytical methods are implemented to investigate the effect of various failure modes such as bending, friction, bundle fracture, and interlaminar crack growth for the observed crushing modes.

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