• 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
More informations : Transgranular stress corrosion cracking of 304L stainless steel pipe clamps in direct use geothermal water heating applications.
High pressure pipe failed by fatigue in the fusion line of longitudinal weld.More informations : Fatigue cracking of high pressure oil tube.
More informations : Failure Analysis of Rocker Liner used as a charging system of Blast Furnace.
More informations : Failure Analysis on antistatic coatings on Radome.
More informations : The shielding effect of wild type iron reducing bacterial flora on the corrosion of linepipe steel.
More informations : Failure analysis of a pinion of the jacking system of a jack-up platform.
It is with great pleasure that I write the first editorial for Case Studies in Engineering Failure Analysis. (Richard Clegg)
We believe that the journal fills an important niche in the market. Other professions such as medicine and the law make great use of case studies, but engineers have not really formalised this to the same extent. It may be that our education tends to lead us to the view that all problems can be solved based on “First Principles” or through a program of rigorous scientific experimentation. But it has long been my belief that an enormous amount can be gained by studying how things behave in practice, and there is no better teacher than failure.
Le Bureau de la sécurité des transports australien (ATSB) a publié son troisième et dernier rapport sur l’accident, après avoir constaté que les tuyaux d’alimentation en huile du moteur n° 2 de l’A380 n’était pas conforme aux spécifications de conception. L’ATSB a constaté que la panne moteur était le résultat d’une fissure de fatigue dans un tuyau d’alimentation en huile. Ce tuyau n’avait pas l’épaisseur de paroi requise.
Depuis l’incident, Rolls-Royce, les organismes de réglementation de l’aviation, et les opérateurs de A380 900 ont pris une série de mesures pour s’assurer que les moteurs avec tubulures d’alimentation en huile mal fabriquées ont été retirés du service ou fixés de manière que l’avion pourrait fonctionner en toute sécurité.
This paper deals with fracture investigations of low pressure (L P) steam turbine blade of a 110 MW thermal power plant in Punjab in India. These blades were made from chrome alloy steel X20Cr13 (Tempered martensitic stainless steel). The main focus of the paper is the fracture analysis, which took place at the airfoil region at 203 mm from the root of the blade. One of the fractured blades was retrieved to identify the cause of failure. The investigations included the visual examination, SEM fractography, chemical analysis, hardness measurement, and micro-structural characterization. While preparing the test specimen, silicon rich phases were detected on the blade along with oxide scale present inside the corrosion pits and fractured region. Transgranular cleavage fractures along with beach marks are observed. The cause of failure is possibly the corrosion-fatigue. These causes of failure are also underlined in this paper.
