Durability Analysis of the Knuckle Arm for a Small Size Car

Arm carA paper published in «  PCO Proceeding 2013 based on AIP Guide« .

Abstract. Traditionally, the durability performance of vehicle components and subsystem has been investigated and verified by testing physical prototypes. In this study, we performed durability analysis of the knuckle arm. In this study, the stiffness and durability of the knuckle installed in a small size car are investigated using commercial software. Parametric analytical studies have been carried out to estimate the stiffness and fatigue life using commercial software.telecharger le doc

Failure analysis of deaerator/sourgas stripper cylinder of ammonia

A new « Case Studies in Engineering Failure Analysis » online 17 June 2014, about the cracking leakage accident of deaerator/sourgas stripper cylinder in a chemical fertilizer plant. The analysis results indicated that improper welding was the main reason for the cylinder cracking failure. Chromic carbide (Cr23C6) was precipitated at partial grain boundaries of the transition region between base metal and weld seam and induced the depletion of Cr element at the grain boundary and in the vicinity of grain boundary. Cl in the media was enriched at the grain boundary of chromium depletion region and formed pitting corrosion, which could lead to stress-corrosion cracking of cylinder under tensile stress.

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Crack of a first stage blade in a steam turbine

A new Case Study in « Case Studies in Engineering Failure Analysis », Volume 2, Issue 2, October 2014, Pages 54–60

The failure of the first stage blade in a steam turbine of 55 MW was investigated. The blade was made of 17-4 PH stainless steel and has been used for 12 years before failure. The current work aims to find out the main cause of the first stage blade failure. The result showed that the crack at the blade root tang was due to corrosion fatigue and the crack occurred at the blade root fillet owing to stress corrosion cracking.

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A detailed review and Prediction of Ductile Fracture

A publication in « IJRAME« , april 2014.

Earlier researchers were studied the failure analysis through various Failure Mode and Effective Analysis (FMEA) technique and tried to predict the fracture before failure occurs. This work attempts to predict the ductile fracture criterion for the sheet metal to avoid the failure by means of considering various controllable and uncontrollable parameters. With the Design of Experiments and the Artificial Neural Network techniques a ductile fracture initiation criteria modeled and the model will be validated through Finite element simulation for the verification of the quality. If comparison results are within the limit condition, the model can be utilized for the prediction of ductile fracture before it happens in the real application.

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EXPLOSION OF IRON HYDROGEN STORAGE CONTAINERS 120 YEARS AGO – Investigations Revisited

An interesting  publication in “Engineering Failure Analysis” available online 24 April 2014.

A nearly authentic translation of Adolf Martenś investigation report on the failure of numerous hydrogen storage cylinders is provided.

  • Explosion of the iron containers caused immense destruction on the air field Berlin-Tempelhof in 1894.
  • The translation reveals very detailed experimental procedures and at that time quite modern materials testing technologies.
  • The importance of Adolf Martens as a pioneer in conducting failure investigations becomes obvious.

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An investigation into failure analysis of interfering part of a steam turbine journal bearing

A new Case Studies in Engineering Failure Analysis. Journal bearings as so sensitive parts of steam turbines are very susceptible to failure through different mechanisms of wear, fatigue and crush during service conditions. Failure occurring through these mechanisms lead to turbine completely shut down as a result of interfering in working conditions of bearing different parts. In this research, failed interfered part of a journal bearing related to a 320,000 kW steam turbine was examined. The studies were revealed that the bearing part loosing and inappropriate clearance can produce relative displacements under cyclic gradient loading. This condition was detrimental for the service life of turbine journal bearing via failure through fretting fatigue mechanism.

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Investigation of Minor Leakage in a Fuel Oil Return Line

A small fuel oil return line of a stationary gas turbine engine failed by high cycle fatigue cracking. In the metallurgical root cause investigation, performed by the original equipment manufacturer’s laboratory, it was determined that insufficient support of the fuel line and the ensuing vibration led to dynamic alternating bending stresses, that had their maximum immediately adjacent to the connector weld of the flange…………. Read more

FLEXURAL FATIGUE FAILURE ANALYSIS OF GLASS POLYESTER UNIDIRECTIONAL ANGLE PLY COMPOSITE LAMINATE

ijerstThis paper, published in « International Journal of Engineering Research and Science & Technology« , presents a study of the fatigue failure behavior of unidirectional angle ply composite laminate. Today a lot of research is directed to understand the fatigue failure behavior of laminated composites. These materials usage is increasing in all sorts of engineering applications due tohigh specific strength and stiffness, low weight and corrosion resistance. Fibre reinforced composite materials are selected for weight critical applications, due to good rating as per the fatigue failure is concerned and these materials are anisotropic in nature. The failure behavior made the study of these materials complicated………….

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Premature failure of heat trace stainless tube

A interesting paper in « Case study in Engineering Failure Analysis » published on ScienceDirect.comIn this case study, a premature failure of Heat Tube was observed. The corrosion product of failed tube indicated the presence of sulfur. This paper brings out the detail of investigation carried out. touche Read more

Etude de la défaillance d’un vilebrequin de moteur marin

A paper in « Engineering Failure Analysis » published on ScienceDirect.com about a  case study of a catastrophic failure of a web marine crankshaft and a failure analysis under bending and torsion applied to crankshafts are presented

 

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