Partner: Zdzisław Jasieński


Recent publications
1.Ranachowski Z., Pawełek A., Jasieński Z., Piątkowski A., Kúdela Jr S., Lewandowski M., Mazuruk P., Durability and wear of engine parts – new methods of testing of alloys and composites, ZESZYTY NAUKOWE / AKADEMIA MORSKA W SZCZECINIE, ISSN: 1733-8670, Vol.35, No.107, pp.125-131, 2013
Abstract:

The paper deals with the problems related to the diagnostics of selected parts of modern Diesel engines. The evolution of mechanical properties of four alloys of Mg-Li-Al system and four composites made on the base of the alloys mentioned above, caused by variation of its composition was presented. The Acoustic Emission (AE) method applied to monitoring of degradation of mechanical properties of the alloys and composites was described. Moreover, the results of the investigation of failures occurring in the injectors of Common Rail Diesel engines per formed with the application of AE method were also reported.

Keywords:

Diesel engines diagnostics, light alloys and composites, Common Rail fuel system, Acoustic Emission method

Affiliations:
Ranachowski Z.-IPPT PAN
Pawełek A.-other affiliation
Jasieński Z.-other affiliation
Piątkowski A.-Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
Kúdela Jr S.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
Lewandowski M.-IPPT PAN
Mazuruk P.-other affiliation
2.Pawełek A., Kúdela S., Piątkowski A., Jasieński Z., Ranachowski Z., Kúdela Jr S., Mechanical and acoustic emission behavior in channel-die compressed Mg9Li alloys before and after treatment by HPT method, INŻYNIERIA MATERIAŁOWA, ISSN: 0208-6247, Vol.3, pp.579-581, 2010
3.Jasieński Z., Pawełek A., Piątkowski A., Ranachowski Z., Twinning and shear band formation in channel - die compressed silver single crystals identified by acoustic emission method, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, Vol.54, No.1, pp.29-33, 2009
4.Pawełek A., Kuśnierz J., Jasieński Z., Ranachowski Z., Bogucka J., Acoustic emission and the Portevin - Le Chatelier effect in tensile tested Al. alloys before and after processing by accumulative roll-bonding (ARB) technique, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, Vol.54, No.1, pp.83-88, 2009
5.Ranachowski Z., Ranachowski P., Rejmund F., Pawełek A., Piątkowski A., Jasieński Z., The study of influence of high pressure torsion process on acoustic emission activity of compressed Mg - Li alloys, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.32, No.4S, pp.123-128, 2008
6.Pawełek A., Ranachowski Z., Piątkowski A., Kúdela S., Jasieński Z., Kúdela Jr S., Acoustic emission and strain mechanisms during compression at elevated temperature of b phase containing Mg-Li-Al composites reinforced with ceramic fibres, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, Vol.52, No.1, pp.41-48, 2007
7.Pawełek A., Piątkowski A., Kuśnierz J., Bogucka J., Jasieński Z., Ranachowski Z., Ranachowski P., Mizera J., Kúdela S., Kúdela Jr S., Acoustic emission in compressed Mg - Li and Al. alloys processed by ECAP, HPT and ARB methods, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.32, No.4, pp.88-94, 2007
8.Pawełek A., Kuśnierz J., Bogucka J., Jasieński Z., Ranachowski Z., Ranachowski P., Rejmund F., Dębowski T., Acoustic emission and the Portevin-Le Chatelier effect in tensile tested Al processed by ARB technique, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.32, No.4, pp.955-962, 2007
Abstract:

The paper presents the investigations of the relation between the acoustic emission (AE) and the Porte vin-Le Chatelier (PL) phenomena occurring in tensile tested two kinds of aluminium alloys: not-predeformed and predeformed earlier using the technique of accumulative rolling banding (ARB). There have been found essential correlations between AE and PL effects in ARB not-predeformed alloys. The tensile tests for ARB predeformed alloys were performed on a series of samples of various degree of work hardening and it has been observed that the correlations between the AE and PL effects are not so pronounced as in the case of ARB not-predeformed alloys. The results of AE measurements obtained using a new software allowed additionally to carry out the spectral analysis of AE signals and, in consequence, to determine the acoustic maps (acoustograms) and the spectral characteristics which are very useful in the discussion of the relations between the non-homogeneous strain mechanisms of the PL effect and the mechanisms of AE events generation. The results are discussed in the context of the existing dislocation models of the PL effect and the theoretical concepts of AE sources

Keywords:

acoustic emission (AE), Portevin-Le Chatelier (PL) effect, tensile test, dislocations, strain mechanism, nanocrystalline and/or ultra fine-grained structure, accumulative rollbonding (ARB)

Affiliations:
Pawełek A.-other affiliation
Kuśnierz J.-other affiliation
Bogucka J.-other affiliation
Jasieński Z.-other affiliation
Ranachowski Z.-IPPT PAN
Ranachowski P.-IPPT PAN
Rejmund F.-IPPT PAN
Dębowski T.-IPPT PAN
9.Pawełek A., Kuśnierz J., Ranachowski Z., Jasieński Z., Anisotropy of acoustic emission and-Portevin-Le Chatelier phenomena in polycrystalline aluminium alloys subjected to tensile tests, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.31, No.4, pp.75-81, 2006
10.Ranachowski Z., Piątkowski A., Pawełek A., Jasieński Z., Spectral analysis of acoustic emission signals generated by twinning and shear band formation in silver single crystals subjected to channel-die compression tests, ARCHIVES OF ACOUSTICS, ISSN: 0137-5075, Vol.31, No.4, pp.91-97, 2006

Conference papers
1.Pawełek A., Kúdela S., Piątkowski A., Jasieński Z., Ranachowski Z., Kúdela Jr S., Ranachowski P., Microcracking of ceramic fibres and acoustic emission in channel-die compressed mg-Li-Al alloys matrix composites, ICSV17, 17th International Congress on Sound and Vibration, 2010-07-18/07-22, Cairo (EG), pp.47-1-8, 2010
Abstract:

The object of investigation was the behaviour of acoustic emission (AE) during channel-die compression of the Mg-Li-Al alloys matrix composites (AMC) reinforced with ceramic δ-Al2O3fibres at room and at elevated temperature. The results of AE measurements at room temperature showed that in the majority of the investigated compositions the effect of anisotropy of the fibres distribution (planar random distribution) appeared with respect to the compression axis, whereas the AE activity at 1400C revealed a two-range character and the level of the rate of AE events was higher than thatat room temperature. These effects are discussed in terms of both, the differences in thermal expansion as well as weakening of the coherency between the fibres and the matrix. The results of AE measurements served to plot the spectral characteristics of the registered AE signals, i.e. the spectral density of AE signal as a function of its frequency. The spectral analysis of AE signals generated during the micro-cracking process of ceramic fibres in channel-die compressed Mg-Li-Al AMC was performed with the Windowed Fourier Transform method. The results are also discussed on the basis of optical and scanning microstructure images including these in-situobservations of microcracking fibres as well as in the context of the dislocation strain mechanisms and microcracking ones during the channel-die compression of the Mg-Li-Al AMC.

Affiliations:
Pawełek A.-other affiliation
Kúdela S.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
Piątkowski A.-Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
Jasieński Z.-other affiliation
Ranachowski Z.-IPPT PAN
Kúdela Jr S.-Institute of Materials and Machine Mechanics, Slovak Academy of Sciences (SK)
Ranachowski P.-IPPT PAN