Naslov
Experimental and Computational Analysis of Pressure Reducer Failure

Autori
Vukelić, Goran ; Brnić, Josip

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
CFRAC 2017, International Conference on Computational Fracture and Failure of Materials and Structures, Book of Abstracts / Moes, Nicolas ; Oliver, Xavier ; Jirasek, Milan ; Allix, Olivier - Nantes : Ecole Centrale de Nantes, 2017, 145-

Skup
Fifth International Conference on Computational Modeling of Fracture and Failure of Materials and Structures CFRAC 2017

Mjesto i datum
Nantes, Francuska, 14.06.2017. - 16.06.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
pressure reducer ; failure analysis ; experiment ; finite element analysis

Sažetak
Flaw appearance, possible crack occurrence and propagation along with the final failure are of serious concern when designing any engineering structure, but especially when dealing with pressure equipment. Defining the cause of failure can help in improving design of future products. Usually, research of failed pressure equipment is aimed at investigation of the root causes of pressure vessel wall cracking, compressor’s impeller blade or crankshaft failures, but there are also failures of auxiliary pressure equipment. They all can cause considerable time and financial losses in industrial plants. One of such failures is investigated in this paper. Using experimental and computational analysis, failure analysis of a cracked pressure reducer on an air compressor was performed. Series of such failures were recorded and an attempt was made to determine the cause of failures. Besides visual examination that revealed location of the fracture, several other experimental techniques were used: optical microscopy revealed basic microstructure of the fractured surface along with possible inclusions while detailed scanning electron microscopy (SEM) examination at suitable magnifications was employed to characterize the fine microstructure of the fractured surface and reveal flaws that served as crack initiation points. Optical emission spectrometer with glow discharge source (GDS) sample stimulation was used to determine chemical composition of material. Additionally, hardness test was performed and maximum tensile strength of the material was derived from it. Further, stress intensity factor was determined computationally by finite element analysis for different crack configurations and loading options. This data was used to perform estimation of failure probability on the basis of failure assessment diagram. Finally, given all performed investigation, possible causes of crack occurrence are outlined. Obtained results can be used in improving further design of such pressure reducers and for predicting their fracture behavior.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo, Temeljne tehničke znanosti

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