Wyniki wyszukiwania - BazTech

1

Measurement of impulse response of shallow water communication channel by correlation method

Schmidt J., Kochańska I., Schmidt A.

Hydroacoustics

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2017

|

Vol. 20

149--158

EN

Performances of underwater acoustic communication (UAC) systems are strongly related to specific propagation conditions of the underwater channel; conditions that can additionally change in time due to the movement of the acoustic system transmitter and receiver or to reflection by underwater objects of the transmitted signal. The time-varying impulse response is a comprehensive description of dynamically changing transmission properties of the UAC channel. It is a basis for estimation of stochastic parameters used for designing the signaling scheme of the communication system. The paper presents the results of a measurement experiment conducted in a shallow water environment. The channel impulse response was measured by the correlation method with the use of two kinds of broadband signals: pseudo-random binary sequence (PRBS) and hyperbolic frequency modulation chirp (HFM). For each measurement result statistical transmission parameters, namely delay spread, Doppler spread, coherence time, and coherence bandwidth were estimated.

2

Nitrogen as an alloying element improving material properties of the high carbon cast steel for ball mill liner plates

Gawlik J., Schmidt J., Nowak T., Wójcicki Z., Zagórski A.

Archives of Civil and Mechanical Engineering

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2017

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Vol. 17, no. 4

926--934

EN

This paper presents an experimental analysis, which was carried out to evaluate the addition of nitrogen as an element complementing a chemical composition used for such cast parts. It has been demonstrated that nitrogen is very advantageous in the process of austenitizing and quenching, improving the stability and homogeneity of the alloy structure. Plates used as a lining of rotary mills operating in cement plants are castings, which acquire their properties mainly through proper heat treatment. Together with an appropriate microstructure and chemical composition, correct heat treatment allow to improve the wear resistance and significantly reduce the abrasive corrosion. Extensive investigations enabled establishing an optimum nitrogen content in the chemical composition of thick-walled castings used in cement industry. Results of experiments, managed for the steel of ledeburate type containing 0.8–1.2% of carbon, have found that the optimal level of nitrogen is in the amount of 0.07–0.10%. The proposed modification helped to reduce the amount of an expensive chromium, increase the hardness of the material (by about 2 HRC to 4 HRC), and to achieve the uniform microstructure and hardness, which noticeably improved the lifetime of the rotary mills plates.

3

The development of an underwater telephone for digital communication purposes

Schmidt J.

Hydroacoustics

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2016

|

Vol. 19

341--352

EN

The underwater telephone HTL-10 has been designed to provide voice and data communication between helicopter and submarines using acoustic waves. It works in a halfduplex mode and uses analogue power-efficient modulation in the form of a single side-band, suppressed carrier, in a wide range of frequencies. It generates the transmitted signal, and processes the received signals. It is implemented with the use of digital signal processing techniques. Although it was designed several years ago, the flexible structure of the underwater telephone ensures a convenient platform for the implementation of various types of communication, as well as testing. This ability is due to the particular characteristics of the digital signal-processing module, which was designed by the author, both in hardware and software. The main elements of the module consist of the fixed-point signal processor, and the floating-point high performance digital signal processor. The article demonstrates the ability to adapt HTL-10 to implement digital communication in shallow waters, with a robust low data rate spread spectrum approach.

4

Digital microcontroller for sonar waveform generator

Schmidt A., Schmidt J.

Hydroacoustics

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2016

|

Vol. 19

353--360

EN

Generating sounding signals is essential for the operation of active sonar. The system should be highly reliable. This can be achieved through architecture, communication between the devices, and a well-designed and self–testing software. The system presented in the article is responsible for the generation of hydroacoustic sounding signals, and ensures proper interaction between power amplifiers and power supplies. Thanks to its structure, the system ensures a very stable generation of many complex sounding signals in the form of linear or hyperbolic frequency modulated pulses (up or down), continuous transmission wave with increasing frequency and others. It is used in the mine-countermeasure sonar, but can also be used in other types of hydroacoustic systems which require complex sounding signals. The article describes possible technical solutions and sounding signals.

5

Impact of Microphytobenthos Photosynthesis on the Characteristics of the Echo Signal from Baltic Sandy Sediments

Gorska N., Kowalska-Duda E., Marszal J., Schmidt J., Klusek Z.

Archives of Acoustics

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2015

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Vol. 40, No. 3

395--405

EN

The understanding the influence of biological processes on the characteristics of the signals backscattered by the sea floor is crucial in the development of the hydroacoustical benthic habitat classification techniques. The impact of the microphytobenthos photosynthesis on the acoustical backscattering properties of the Atlantic sandy sediments was previously demonstrated by Holliday et al. (2004) and Wildman and Huettel (2012). To account for the sensitivity of the hydroacoustical classification techniques to the backscattering properties of local marine sediments, it is important to understand the microphytobenthos photosynthesis impact for the Baltic Sea where the techniques are being actively developed now. This is the main motivation of the paper. In the paper the influence of the microphytobenthos photosynthesis on the characteristics of the echo signals reflected by sandy sediments in the typical Baltic temperature and the salinity conditions is discussed. The interdisciplinary multiday laboratory experiment was conducted to study the impact of benthic microalgal photosynthesis on the characteristics of the echo signal reflected by sandy sediments. Hydroacoustical data were collected under controlled constant light, temperature and salinity conditions. The oxygen content at different levels of the water column was simultaneously monitored.

6

Reliable underwater communication system for shallow coastal waters

Schmidt J.

Hydroacoustics

|

2014

|

Vol. 17

171--178

EN

This paper presents a reliable and robust low data rate spread spectrum approach which is implemented in the acoustic underwater communication system for shallow coastal waters. It shows operation assumptions of spread spectrum techniques based on the wellknown Shannon equation. It describes two methods of spread spectrum: frequency hopping spread spectrum and direct sequence spread spectrum; their block diagram and their characteristics are then listed to make comparisons. In short, adverse channel effect is analyzed on the expected operation of the system. I present the platform for the target implementation of the acoustic underwater communication system, which now has to allow continuous and easy development of stable algorithms.

7

Analiza sygnałów emisji akustycznej do wykrywania uszkodzeń zmęczeniowych w stali okrętowej

Baran I., Nowak M., Schmidt J.

Przegląd Spawalnictwa

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2013

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R. 85, nr 5

2--7

PL

Uszkodzenia korozyjne i pęknięcia zmęczeniowe to główne przyczyny awarii konstrukcji wszelkich środków transportu, takich jak statki (tankowce), autocysterny i cysterny kolejowe. Oba rodzaje degradacji zarówno materiału, jak i konstrukcji są przedmiotem badań w projekcie realizowanym w ramach VII kooperacyjnego programu ramowego UE (Transport) pt. Cost effective corrosion and fatigue monitoring for transport products. W artykule przedstawiono pierwsze wyniki analizy uszkodzeń zmęczeniowych z zastosowaniem emisji akustycznej (AE) przeprowadzone na materiale stosowanym do budowy statków. AE umożliwia monitorowanie propagacji pęknięć w czasie wolnozmiennych prób zmęczeniowych w warunkach asymetrycznego trójpunktowego zginania. Oczekiwano, że warunki propagacji pęknięcia zmęczeniowego będą się zmieniać od sposobu I do sposobu mieszanego I/II, co byłoby bliższe rzeczywistym warunkom pracy. Wykonano również badania zmęczeniowe z wykorzystaniem cieczy w celu określenia i oceny różnicy w propagacji fal AE poprzez ciecz i materiał będący w kontakcie bezpośrednim z tą cieczą. Dane pomiarowe uzyskane podczas badań zmęczeniowych zawarte są w bazie danych, wykorzystywanej do analizy metodą pattern recognition do separacji sygnałów AE pochodzących z propagacji pęknięć zmęczeniowych i korozji od tła akustycznego.

EN

Corrosion damages and fatigue cracks are the main causes of structural failures in all surface transport products as ships, road tankers and railway tank cars. Both types of degradation, i.e. the degradation of material and structure, are the subject of investigations carried out within the framework of a collaborative project of the 7th Framework Programme (Transport) entitled Cost effective corrosion and fatigue monitoring for transport products. In this paper, the first fatigue tests using acoustic emission (AE) performed on ship building materials have been demonstrated. AE enables us to monitor the crack propagation during low fatigue tests performed on specimens under asymmetric three-point bending load. It was expected that fracture behaviour would move from Mode I to Mixed-Modes I/II, which would be closer to reality. For reference, tests were also made in liquid to obtain and evaluate the differences in AE waves propagation in liquid and in material directly contacting this liquid. The data obtained during fatigue tests are included in a database used in pattern recognition analysis to separate the signals due to fatigue crack propagation and corrosion damages from background noise.

8

Studying the effectiveness of the NiCrN alloy forging process

Schmidt J., Kazakov A., Zagórski A., Świątoniowski A.

Management and Production Engineering Review

|

2013

|

Vol. 4, No. 4

59--65

EN

Chromium- and nickel based alloys offer good mechanical properties, while keeping them also in highly corrosive environment. In addition, the introduction of the nitrogen at the level of 0.3 to 0.5% to the alloy structure, increases the plastic deformation ability of the cast alloy. This observation is fully confirmed by the results of the plastic deformation tests (performed on Gleeble), which are presented in this paper. The laboratory samples made of NiCrN wrought alloy and processed by die forging, demonstrated the significant increase of the yield stress and plastic deformation ability for the applied deformation degrees. The experiments showed about twofold increase of the resistance to cyclic loading for the forged products, when comparing it to the initial alloy state after casting. The developed technology (validated by numerical simulations) has been used to manufacture the workpiece for the propeller shaft. The results of the deformation performance for the element subjected to plastic processing have been compared with the material in its cast state.

9

Implementation of the digital receiver in multibeam long-range sonar

Schmidt J., Schmidt A.

Hydroacoustics

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2013

|

Vol. 16

203--210

EN

The article presents the implementation of a digital receiver in multibeam long-range sonar. Developed by the authors of the article, the implementation was part of sonar modernisation on large Polish Navy ships. The article explains the structure of the receiver, its design details and requirements affecting the architecture. The technical solutions regarding the equipment and signal processing algorithms for determining receiving beams for the active and passive mode are discussed. Key to the receiver design is the signal processing module responsible for determining the multibeam spatial filter (beamformer). Aspects of modern data transmission as used in the device are also discussed.

10

Acoustic processor of the MCM sonar

Rudnicki M., Schmidt J., Schmidt A., Leśniak W.

Automatyka / Automatics

|

2013

|

Vol. 17, no. 1

73--82

EN

This paper presents the concept of an acoustic processor of the mine countermeasure sonar. Developed at the Department of Marine Electronics Systems, Gdańsk University of Technology, the acoustic processor is an element of the MG-89, a modernised underwater acoustic station. The focus of the article is on the modules of the processor. They are responsible for sampling analogue signals and implementing the algorithms controlling the measurement cycle and digital signal processing. As it performs the above funetions, the device should be highly reliable and resistant to mechanical and weather conditions and ensure a user friendly operation. The functions of the processor software should help with object detection and classification. In addition to these properties, the acoustic processor should operate in real time. The results of measurements should be displayed with the shortest possible delay in relation to sounding signals to allow the operator to take decisions ąuickly and establish if the object poses a risk.

PL

W artykule przedstawiono koncepcję procesora akustycznego sonaru MCM (ang. Mine Countermeasure Sonar), opracowaną i zrealizowaną w Katedrze Systemów Elektroniki Morskiej Politechniki Gdańskiej. Opisany procesor akustyczny jest elementem zmodernizowanej stacji hydrolokacyjnej MG-89. Zwrócono szczególną uwagę na moduły procesora, które odpowiadają za proces próbkowania sygnałów analogowych oraz realizują algorytmy sterowania cyklem pomiarowym i cyfrowego przetwarzania sygnałów. Urządzenie to przy wykonywaniu wyżej wymienionych funkcji powinno cechować się dużą niezawodnością oraz odpornością na narażenia mechaniczne i klimatyczne, a z punktu widzenia operatora - łatwością obsługi. Oprogramowanie procesora powinno zawierać funkcje ułatwiające detekcję i klasyfikację wykrytych obiektów. Poza wymienionymi właściwościami procesor akustyczny powinien również być systemem czasu rzeczywistego. Wyniki pomiarów powinny pojawiać się na zobrazowaniu z możliwie najmniejszym opóźnieniem, w stosunku do sygnałów sondujących, tak aby operator systemu mógł, w jak najkrótszym czasie, podjąć decyzję, czy wykryty obiekt jest niebezpieczny.

11

Non-linear mechanical analysis of the composite overwrapped cylinder for hydraulic applications

Nowak T., Schmidt J.

Advances in Manufacturing Science and Technology

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2013

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Vol. 37, nr 4

31--48

EN

This paper provides a new method for an elasto-plastic analysis of stress and deformation fields in the composite overwrapped cylinder under the pressure load. The cylinder structure consisting of steel liner and composite shell was examined. The non-linear properties of the steel tube, and orthotropic properties of the composite were assumed in this analysis. The compound cylinder was checked against internal working pressure and external axial forces. The optimal design parameters of the pressurized vessel were found by analytical as well as numerical methods, and later validated in experimental measurements. It was generally found, that composite reinforcement does not contribute very much to the mechanical performance of the cylinder when the steel liner works in elastic range, but, in contrast, it provides a big support when the metal tube approaches plastic deformation. This phenomenon allows to increase the power-to-weight ratio of the pressurized vessel, what is especially important for demanding hydraulic applications.

PL

W pracy przedstawiono metodę analizy mechanicznej cylindra hydraulicznego wzmocnionego płaszczem kompozytowym. Cylinder poddano obciążeniu roboczemu wywołującemu odkształcenie sprężysto-plastyczne. W analizie uwzględniono nieliniową zależność naprężenie-odkształcenie dla tulei metalowej, natomiast dla kompozytu polimerowego założono ortotropię jego właściwości. Obciążenie robocze powoduje zarówno ciśnienie działające na wewnętrze ścianki cylindra, jak i zewnętrzna siła osiowa. Zaproponowano nową, analityczną metodę obliczeniową. Stanowi ona podstawę do optymalizowania konstrukcji cylindra: doboru materiału kompozytowego, orientacji poszczególnych warstw oraz ich grubości. Prowadzono zarówno weryfikację numeryczną metodą elementów skończonych, jak i laboratoryjną poprzez realizację opracowanego programu badań. Analiza uzyskanych wyników pozwala stwierdzić, że wzmocnienie kompozytowe nie jest znacznie obciążone, dopóki stalowa tuleja pracuje w zakresie sprężystym odkształcenia. Zwiększenie obciążenia roboczego powoduje, że naprężenie jest większe od granicy sprężystości metalu. Zwiększa się również odkształcenie plastyczne. Wówczas znaczną część obciążenia przejmuje płaszcz kompozytowy. Zjawisko to jest korzystne – umożliwia lepsze wykorzystanie materiału cylindra i jednocześnie zabezpiecza tuleję stalową przed nadmiernym obciążeniem.

12

Acoustic processor of the mine countermeasures sonar

Rudnicki M., Schmidt J., Schmidt A., Leśniak W.

Hydroacoustics

|

2012

|

Vol. 15

179-186

EN

This paper presents the concept of an acoustic processor of the mine countermeasure sonar. Developed at the Department of Marine Electronics Systems, Gdansk University of Technology, the acoustic processor is an element of the MG-89, an underwater acoustic station. The focus of the article is on the modules of the processor. They are responsible for sampling analogue signals and implementing the algorithms controlling the measurement cycle and digital signal processing. As it performs the above functions, the device should be highly reliable and resistant to mechanical and weather conditions and ensure a user friendly operation. The functions of the processor software should help with object detection and classification. The results of measurements should be displayed with the shortest possible delay in relation to sounding signals to allow the operator to take decisions quickly and establish if the object poses a risk. The article demonstrates that the acoustic processor designed for and used by the Navy meets these requirements.

13

Analiza morfologiczna wybranych ekotypów Lotus corniculatus L. z kolekcji Instytutu Hodowli i Aklimatyzacji Roślin w Bydgoszczy

Jendrzejczak E., Majtkowski W., Schmidt J.

Ekologia i Technika

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2012

|

R. 20, nr 5

313-320

PL

W 2010 r. wykonano obserwacje kolekcji komonicy zwyczajnej, prowadzonej na terenie Ogrodu Botanicznego Instytutu Hodowli i Aklimatyzacji Roślin, Oddział w Bydgoszczy. Do szczegółowych porównań cech morfologicznych wybrano 6 ekotypów i jedną odmianę ustalona. Stwierdzono, że potomstwo ekotypów komonicy zwyczajnej dochodzącej z naturalnych lokalizacji utrzymuje cechy morfologiczne i dynamikę wzrostu podobne do materiału wyjściowego. Istotne różnice między ekotypami polegają na odmiennościach w tempie odrastania po ruszeniu wegetacji oraz tendencji do regeneracji po skoszeniu.

EN

In 2010 an examination of morphological traits in the collection of ecotypes of the bird's foot trefoil was carried out by the Bydgoszcz Research Division of Plant Breeding and Acclimatization Institute. 6 chosen ecotypes and one cultivar were compared in detail in the study. They stated. that progeny of ecotypes of the bird's foot trefoil coming from natural location are keeping traits of the description and dynamics of the growing, it is possible to assign to the dissimilarity for conditions of their habitations of the origin. Substantial differences referred between ecotypes in the range of regrowth after moving the vegetation and the capacity for the regeneration after cutting.

14

Analysis of forging process of the NiCrN superalloy for motor boat driving shaft

Świątoniowski A., Sińczak J., Łukaszek-Sołek A., Schmidt J.

Archives of Metallurgy and Materials

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2012

|

Vol. 57, iss. 3

719-725

EN

Superalloys containing nickel and chromium display high deformation resistance and low plasticity during high-rate plastic forming processes, thus limiting the potentials to improve their mechanical parameters. At the aim to overcome this problem an NiCrN superalloy has been found. In this paper the analysis of forging of this NiCrN superalloy has been presented. Mathematical FEM model of the process are verified by experimental tests run on a double-acting power hammer. Tests reveal, that plastic working of the NiCrN alloy combined with thermal treatment improves its strength by nearly 25%, at the same time its plastic deformability remains the same. Research work has revealed very high resistance to corrosion of the alloy when subjected to stress and marine environment.

PL

Superstopy opracowane na bazie niklu i chromu charakteryzują sie dużym oporem odkształcenia i niska zdolnością do odkształceń plastycznych. Ogranicza to w poważnym stopniu możliwość podniesienia ich własności mechanicznych na drodze przeróbki plastycznej, a tym samym i zakres ich zastosowania jako materiału konstrukcyjnego. W celu rozwiązania tego problemu został opracowany nowy, unikalny skład chemiczny stopu NiCrN. Przeprowadzono modelowanie numeryczne procesu kucia matrycowego opracowanego stopu oraz weryfikacje eksperymentalna na młocie parowo-powietrznym podwójnego działania. Przeprowadzone badania pozwoliły stwierdzić, ze w wyniku odkształcenia plastycznego stopu NiCrN połączonego z obróbka cieplna można uzyskać blisko 25% wzrost jego własności wytrzymałościowych. Ponadto wykazano bardzo wysoka odporność na korozję stopu.

15

Przydatność metody emisji akustycznej w ocenie stanu mostów kolejowych o konstrukcji stalowej – wyniki zastosowania i propozycje rozwoju

Nowak M., Gawlik J., Schmidt J.

Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne

|

2011

|

Nr 96, z. 158

353--366

PL

W artykule przedstawiono wyniki prac przeprowadzonych dla sprawdzenia możliwości i opracowania skutecznego sposobu ujawniania, lokalizacji i oceny uszkodzeń korozyjnych metodą emisji akustycznej (AE) na stalowych konstrukcjach mostowych. Przedstawiono również przykłady i ocenę możliwości zastosowania metody AE do identyfikacji uszkodzenia typu pęknięcie bezpośrednio na elementach mostów stalowych. W artykule zawarto także propozycję dalszego rozwoju zastosowania metody AE mającego na celu określanie poziomu obciążenia granicznego bezpiecznej eksploatacji mostu i kontrolowanego czasowego użytkowania obiektu z występującym uszkodzeniem.

EN

The results of works for elaboration an efficient way to reveal, locate and estimate corrosion damages using acoustic emission (AE) method at steel bridge constructions have been presented in the paper. The examples and assessment of AE method application to identification damages like cracks directly on steel bridges elements have been also presented. The proposals for AE method application development to define the level of admissible load in bridge safety exploitation and time controlled usage of the object with an emerging damage have been given.

16

Analysis of vortex finder geometry and its influence on cyclone's efficiency and wearing processes by computational fluid dynamics

Nowak T., Gawlik J., Schmidt J.

Management and Production Engineering Review

|

2011

|

Vol. 2, No. 1

27-33

EN

Cyclones are widely used for removal dust of gaseous flows in industrial processes, and various studies were conducted in last decades to improve their performance parameters. However, in process industry, the reliable and uninterrupted operation of the cyclone is of the same importance as performance capabilities. In this work, the effect of vortex finder geometry on wearing processes is analyzed. The work relates to the gas-solid flow, which can be found in real dry-process kiln systems used in cement plants. Numerical studies were performed using Computational Fluid Dynamics software package, and covered three different geometrical versions of analyzed object. The relevant velocities of gas-solid medium within the cyclone, as well as pressure values were calculated with help of DES turbulence model. As a result - the design variant offering best balance between performance parameters and wearing resistance was pointed out.

17

Silent sonar with matched filtration

Salamon R., Marszal J., Schmidt J., Rudnicki M.

Hydroacoustics

|

2011

|

Vol. 14

199-208

EN

Radars with continuous wave frequency (CW FM sonars) are used in radiolocation as ‘silent radars’. They determine the distance to target by measuring the difference between the frequency of the sounding signal and echo signal. The article presents the principle of operation and parameters of silent CW FM sonars. Target distance determined by these sonars is based on the signal at the output of the matched filter. The Doppler effect is studied in detail to identify its effect on the sonar’s parameters. The results of theoretical calculations are presented together with the results of the sonar’s computer simulation.

18

Modernization of ASW sonar SQS-56 at Gdansk University of Technology

Marszal J., Schmidt J., Salamon R., Kilian L., Raganowicz A., Zachariasz K., Ostrowski Z., Jedel A., Rudnicki M., Sidorko T.

Hydroacoustics

|

2010

|

Vol. 13

191-196

EN

The fast development of electronic technology and digital signal processing methods makes electronic devices, including sonar systems ones, obsolete very quickly. On the other hand the ships mechanical components including mechanical parts of sonars are operational for a few dozens of years. It makes good opportunity to modernize these devices by using modern electronic devices and new digital signal processing methods with application of existing antenna and mechanical systems. The paper presents the modernization of ASW sonar SQS-56 on the Polish frigate ORP “Kościusko”. The aim of modernization, the new parameters of the sonar and block diagram after modernization are presented.

19

Method for improving multibeam sonar bearing accuracy

Leśniak W., Marszal J., Salamon R., Zachariasz K., Schmidt J.

Hydroacoustics

|

2009

|

Vol. 12

98-108

EN

The paper presents a simple method for improving multibeam sonar bearing accuracy. The principle proposed here is similar to the monopulse method, a solution commonly used in radars and sonars. With no manual or automatic beam rotation, the method offers a substantial reduction in the demand for sonar computational effort. It significantly reduces bearing error for a relatively high signal to noise ratio. The paper gives a boundary value of the output signal to noise ratio which when exceeded satisfactorily improves bearing accuracy.

20

Wpływ temperatury i prędkości odkształcenia na naprężenia uplastyczniające stopu CrNiN

Sińczak J., Świątoniowski A., Schmidt J., Szostak J.

Rudy i Metale Nieżelazne

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2008

|

R. 53, nr 7

418-424

PL

Postęp w konstrukcji i eksploatacji maszyn pozostaje dziś w znacznym stopniu zdeterminowany przez użycie nowych materiałów i technologii. W artykule omówiono jeden z takich właśnie materiałów - stop CrNiN. Jest to stop na bazie chromu i niklu endogenicznie modyfikowany azotem i pierwiastkami tworzącymi azotki. Pierwiastki te oraz azot mogą w procesie wytopu i odlewania oddziaływać ze sobą, tworząc w strukturze wydzielenia w postaci azotków tytanu. W celu określenia zdolności stopu CrNiN do odkształceń plastycznych wykonano badania na symulatorze Gleeble 3800. Uzyskane krzywe umocnienia posłużyły do wykonania symulacji komputerowych procesu spęczania przy warunkach brzegowych zgodnych z rzeczywistymi. Wyznaczono rozkłady odkształceń i naprężeń w procesie spęczania badanego stopu, umożliwiające podejmowanie decyzji związanych z możliwym zakresem i rodzajem procesów przeróbki plastycznej.

EN

Nowadays progress in machine construction and its exploitations are mostly determined by using new materials and technology. In this study one of the example of such a material - CrNiN-alloy has been presented. These alloy represent chromium and nickel basis alloyed by nitrogen and nitrides forming elements, which under suitable conditions could react between themselves forming nitrides particles. At the aim of determine the plastic property of the CrNiN alloy some tests have been made using Gleeble 3800 thermo-mechanical simulator. On the basis of the work hardening curve obtained that way numerical simulation of the upset forging have been made taking into account the real boundary conditions of the process. Stress pattern as well as plastic strain distributions have been also obtained. This enable to decide about possible range of the CrNiN alloy plastic deformation process.