Formations en Analyses de Défaillances

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Publicités

Erosion of glass fibre reinforced époxy composites

An article published on the JOURNAL OF THE EGYPTIAN SOCIETY OF TRIBOLOGY (VOLUME 14, No. 2, April 2017).

Sand erosion of epoxy resin reinforced by randomly distributed glass fibres and filled by synthetic, paraffin and glycerine oils is studied. The effect of inclination of impact angle and oil content contained in the matrix of epoxy resin is investigated. In addition, the electrostatic charge generated on the eroded surface is measured. Reinforced epoxy demonstrates low erosion resistance compared to unreinforced epoxy. SEM surface examination reveals the effect of inclination angle on wear. Specimens filled by oil lose the electrostatic charge generated from sand erosion in earlier time compared to the unfilled test specimen.

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Failure investigations of a first stage Ni based super alloy gas turbine blade

2016-10-25_17h11_11A paper presented at the « International Conference on Processing of Materials, Mineral and Energy », 29th and 30th july 2016, PACE Institute of Technology & Sciences, India. It had been published by Elsevier.

This paper deals with the failure investigations of the first stage gas turbine blade of 30MW gas turbine. This blade is manufacture with of nickel based super alloy IN738. The main focus of the paper is to found the causes of failure of the blade. By the investigations, it is found that the blade failure takes place due to the combined effect of erosion, oxidation, overheating, and hot corrosion.

More at : http://www.pmme.co.in/papers/EMT-087.pdf

Failure analysis of a leaked oil pipeline

2015-10-18_11h39_48A new paper in « Case Studies in Engineering Failure Analysis« .

An oil pipeline embedded in an underground trench had failed. Through the accident investigation they found that there was a perforation at the leak point of the pipeline. After careful analysis it is concluded that the leakage of the pipeline was mainly caused by the liquid impingement erosion.

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Erosion of heat exchangers due to sootblowing

The erosion rate of convection surfaces is crucial for boiler reliability. This paper presents the impact of the action of a sootblowing stream (steam and air) jet on the sustainability of tubes. The model investigations described here compared the erosion rates of a tube bank while turning on or off an additional jet stream of compressed air that simulates the operation of a sootblower. This paper presents calculations for the erosion loss of a heat exchanger built in the actual object.

Failure analysis of solenoid valve components

Valve had failed as a result of particles of material becoming trapped between the valve seat recess and the valve seat ball, leading to erosion of the valve seat recess, valve seat ball and the valve operating pin; this allowed hydraulic fluid to flow when the valve was nominally in the de-energised position.The material of construction of the valve seats was not compliant with engineering drawings.The investigation demonstrated the importance of maintaining the cleanliness of hydraulic systems and of the need to control the materials of manufacture in safety critical applications.

Read more at : Failure analysis of solenoid valve components from a hydraulic roof support.

Erosion process analysis of die-casting inserts for magnesium alloy components

Highlights

• The corrosion process of the failure insert in cold chamber machine was directly presented.

• The surface morphology and chemical composition were analysed.

• The mechanism of erosion relies on the depression, plastic deformation and tearing action.

• The average impact pressure of a liquid drop against a solid plane was calculated.

More information : Erosion process analysis of die-casting inserts for magnesium alloy components

Failure Analysis on antistatic coatings on Radome

The damage of the inelastic coating was more serious than the elastic coating. The failure causes of the antistatic coating on the radome were analyzed. The results show that the failure of inelastic and elastic antistatic coatings was caused by particles erosion, and the aging of the coatings accelerated the failure of coatings. The elastic coating had better anti-erosion ability than the inelastic coating because of its high fracture elongation and good elastic deformation, so its damage was lighter than the inelastic coating.

More informations : Failure Analysis on antistatic coatings on Radome.

Défaillances multiples de tubes de pipeline de gaz naturel

ScienceDirect.com signale un article à paraître dans la revue Engineering Failure Analysis de juillet 2013 : Multiple failures of API 5L X42 natural gas pipeline.

 

 

 

Il s’agit de l’étude d’un cas concret de perforation de tube en acier revêtu de goudron servant au transport de gaz naturel. Les perforations multiples ont été provoquées par des fuites d’eau sous pression d’une autre canalisation passant à proximité.

Usure par érosion résultant de l’exfoliation des oxydes de fer dans les surchauffeurs

ScienceDirect.com rapporte une étude publiée dans la revue « Engineering Failure Analysis » concernant l’usure par érosion résultant de l’exfoliation des oxydes de fer dans les surchauffeurs austénitiques de chaudière.

Basé sur des tests de laboratoire et le retour d’expérience du fonctionnement de la chaudière, ce document présente le phénomène d’exfoliation d’oxydes de la surface des tubes de surchauffeurs en acier austénitique et le modèle de calcul développé pour déterminer la vitesse d’érosion de la chaudière et des composants de la turbine par les particules solides transportées par la vapeur.