Failure analysis of a burner ring made of 20Cr32Ni1Nb alloy in gas turbine combustion chamber

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

The failure analysis of an insert ring of a burner in a 156 MW gas turbine, made of 20Cr32Ni1Nb alloy is presented. Normally, the useful service life of these parts under ideal conditions is about 30000 hours. However, more likely fracture and failure could be observed in5000-hour inspections, which resulted in the early and premature replacement of these parts. This paper brings out the detail of investigation carried out.

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Analysis and Performance of Automobile Engine Components Considering Thermal and Structural Effects

automotive failuresAn article published in « International Journal of Innovative Research in Science, Engineering and Technology« , January 2014.

This paper presents an investigation report of effect of various parameters which affect the performance of an automobile engine. Almost all internal combustion engines have at least one connecting rod to transmit the thrust of the piston to the crankshaft, and as the result the reciprocating motion of the piston is translated into rotational motion of the crankshaft. From the viewpoint of functionality, connecting rods must have the highest possible rigidity at the lowest weight capable to withstand varying loads. It has been found that structural failure of various components results in engine missing and starts producing noise and vibration during racing, mileage gets affected and black or white smoke arise also pickup gets reduced. In automobile industry damaged or broken parts are generally too expensive to replace or repair especially in case of engine. In this concern they presented detailed analysis of causes along with preventive maintenance suggestion schedule for better engine life. 

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Analyse de défaillance d’un cas de fatigue thermique sur un laiton moulé

Dhouha Melloulia, Nader Haddara, Alain Kösterb, Hassine Ferid Ayedia

a Laboratory of Industrial Chemistry and materials, National Engineering School of Sfax, Box1173, W3038, Sfax, Tunisia
b Centre des matériaux Pierre Marie Fourt, Ecole des Mines de Paris

Abstract

This research has been conducted to elucidate the mechanisms of brass die casting failure. A die was examined and we have evaluated the causes of crack failure mechanisms after use in brass die casting. The dominating failure mechanism in the investigated die was thermal fatigue cracking. Crack initiation is associated to accumulation of the local plastic strain that occurs during each casting cycle. The crack growth is facilitated by a number of elements: oxidation of the cracks’ surfaces, filling of brass and softening of the die material.