Institute of Fundamental Technological Research
Polish Academy of Sciences

Staff

Ved Prakash Dubey, MSc

Department of Experimental Mechanics (ZMD)
Division of Strength of Materials (PWM)
Laboratory for Testing of Materials and Structures
position: PhD Student
PhD student
telephone: (+48) 22 826 12 81 ext.: 402
room: 535
e-mail:
ORCID: 0000-0002-6020-7359

Recent publications
1.  Kopeć M., Dubey Ved P., Pawlik M., Wood P., Kowalewski Z.L., Experimental identification of yield surface for additively manufactured stainless steel 316L under tension–compression-torsion conditions considering its printing orientation, Manufacturing Letters, ISSN: 2213-8463, DOI: 10.1016/j.mfglet.2024.07.003, Vol.41, pp.28-32, 2024

Abstract:
Stainless steel 316L tubes and bars were additively manufactured (AM) by using the Laser Powder Bed Fusion Melting (LPBF-M) method in three orientations. As-built specimens were then machined and the initial yield surface was determined for three printing orientations based on the yield stress definition for 0.005 % plastic offset strain. The as-received, wrought material was additionally tested using the same tension–compression-torsion conditions to compare the mechanical behaviour of AM and wrought SS316L. The sizes of yield surfaces elaborated for LPBF-M specimens increased along the tensile and compressive directions and shrunk when torsion was applied, as compared to the as-received specimen.

Keywords:
Stainless steel ,Yield surface ,Additive manufacturing

Affiliations:
Kopeć M. - IPPT PAN
Dubey Ved P. - IPPT PAN
Pawlik M. - other affiliation
Wood P. - University of Derby (GB)
Kowalewski Z.L. - IPPT PAN
2.  Dubey Ved P., Kopeć M., Łazińska M., Kowalewski Z.L., Yield surface identification of CP-Ti and its evolution reflecting pre-deformation under complex loading, International Journal of Plasticity, ISSN: 0749-6419, DOI: 10.1016/j.ijplas.2023.103677, Vol.167, pp.1-21, 2023

Abstract:
Uniaxial testing methods to characterize materials provide only limited data that is insufficient to fully understand all aspects of their behaviour, such as initial texture or anisotropy. Therefore, this research aims to conduct complex stress loading experiments to understand the physical mechanism accountable for plastic deformation caused by monotonic tension and tension assisted by proportional cyclic torsion in the CP-Ti (Commercially Pure Titanium). The yield surface approach was applied to assess the variation of mechanical properties in the as-received and predeformed material. It was found, that such monotonic tension associated with cyclic torsion caused a significant decrease of the tensile stress. The initial yield surface obtained for the asreceived material exhibits anisotropic behaviour, whereas, the sizes of subsequent yield surface reflecting pre-deformation were reduced in all directions with exception of the tension direction.

Keywords:
yield surface,pre-deformation,plastic anisotropy,cycle loading,tubular specimen

Affiliations:
Dubey Ved P. - IPPT PAN
Kopeć M. - IPPT PAN
Łazińska M. - Military University of Technology (PL)
Kowalewski Z.L. - IPPT PAN

List of chapters in recent monographs
1. 
Kujur M.S., Dubey V.P., Mallick A., Gupta M., Encyclopedia of Materials: Composites, rozdział: Tensile Characteristics of Metal Matrix Composites, Elsevier, pp.298-312, 2021

Conference papers
1.  Dubey V.P., Kopeć M., Mallick A., Kowalewski Z.L., The effect of enhanced solid solubility on the microstructure and mechanical properties of Al-Cr solid solution by powder metallurgy process, XXII Międzynarodowa Studencka Sesja Naukowa “Materiały i Technologie XXI Wieku, 2021-05-28/05-28, on-line Katowice (PL), pp.59-64, 2021

Abstract:
Al-Cr alloys are usually used in home appliances, automotive, marine and aerospace applications as these possess superior properties like high strength-to-weight ratio, good corrosion resistance and workability. In Al-Cr alloys, chromium has severely limited strengthening effects due to its relatively low solid solubility in the aluminium matrix. The high content of chromium in Al matrix leads to the discontinuous precipitation with coarse Al7Cr intermetallic phase. In this study, powder metallurgy (P/M) technique followed by microwave assisted sintering was adopted for the synthesis of Al-xCr (x = 0, 2.5 and 5 wt%) alloys to enhance the solid solubility of Cr. Specimens were sintered at 560 ºC for one hour and cooled inside the microwave atmosphere. Sintered specimens were hot extruded and characterized in terms of the mechanical properties. Mechanical characterization showed that the addition of Cr as alloying element leads to an increase in microhardness, 0.2% tensile yield strength (TYS) and ultimate tensile strength (UTS) of the Al-alloy. However, the ductility of the Al-alloys was significantly decreased by the incorporation of Cr particulates in the aluminium matrix.

Keywords:
Al-Cr system, powder metallurgy technique, hybrid microwave sintering, mechanical properties

Affiliations:
Dubey V.P. - IPPT PAN
Kopeć M. - IPPT PAN
Mallick A. - Indian Institute of Technology (IN)
Kowalewski Z.L. - IPPT PAN

Conference abstracts
1.  Dubey V.P., Kopeć M., Pawlik M., Wood P., Kowalewski Z.L., Yield surface identification of additively manufactured stainless steel 316L considering its printing orientation, KonDokPAN 2024, The 8th edition of the Conference of Doctoral Students of the PAS, 2024-10-11/10-13, Warszawa (PL), pp.38-38, 2024
2.  Dubey V.P., Kopeć M., Kowalewski Z.L., Experimental identification of yield surface for Ti-Cu bimetal and its evolution due to pre-deformation, SolMech 2024, 43rd Solid Mechanics Conference, 2024-09-16/09-18, Wrocław (PL), pp.109-109, 2024
3.  Dubey V.P., Kopeć M., Kowalewski Z.L., CP-Ti YIELD SURFACE EVOLUTION AFTER PRE-DEFORMATION UNDER COMPLEX LOADING, DAS 2024, 40th DANUBIA-ADRIA SYMPOSIUM on Advances in Experimental Mechanics, 2024-09-24/09-27, Gdańsk (PL), pp.181-182, 2024
4.  Dubey V.P., Kopeć M., Pawlik M., Wood P., Kowalewski Z.L., Effect of Build Orientation on the Yield Surface of Stainless Steel 316L Fabricated by Laser Powder Bed Fusion Melting (LPBF-M), BSSM, 18th International Conference on Advances in Experimental Mechanics, 2024-09-03/09-05, Liverpool (GB), pp.1-2, 2024

Abstract:
The Laser Powder Bed Fusion Melting (LPBF-M) method was used to additively manufacture stainless steel 316L tubes in three different orientations. The yield surface approach was implemented to assess the variation of mechanical properties within the as-built specimens. Yield surfaces were determined for each build orientation based on the definition of yield stress for 0.005% plastic offset strain. The initial yield surfaces obtained for the as-built material exhibit anisotropic behaviour, possibly resulting from the preferred grain orientation developed during LPBF-M processing.

Affiliations:
Dubey V.P. - IPPT PAN
Kopeć M. - IPPT PAN
Pawlik M. - other affiliation
Wood P. - University of Derby (GB)
Kowalewski Z.L. - IPPT PAN
5.  Kowalewski Z.L., Dubey V.P., Kopeć M., ASSESSMENT OF INITIAL AND SUBSEQUENT YIELD SURFACES OF TI-CU BIMETALLIC STRUCTURE AFTER PRE-DEFORMATION INTRODUCED BY COMPLEX LOADING, XL ZJAZD DELEGATÓW PTMTS, XII KONFERENCJA Nowe Kierunki Rozwoju Mechaniki IX SYMPOZJON, 2024-03-13/03-16, Łężyce 48 (PL), pp.1-2, 2024

Abstract:
Investigating of the material properties and physical mechanisms responsible for plastic deformation caused by complex loading is crucial for bimetallic structures. These materials are a type of functionally graded multi-material structures designed to combine diverse material properties within the same framework while optimizing manufacturing costs. In the present work, the initial yield surface and its subsequent evolution were determined for a Ti-Cu bimetal based on the definition of yield stress for 0.01% plastic offset strain. The subsequent yield surfaces were determined after introducing monotonic axial tension and axial tension-cyclic torsion pre-deformation up to 1% permanent axial strain. It was found, that the determined initial yield surface was close to the Huber-Mises locus. Furthermore, subsequent yield surfaces were determined to assess a hardening/softening effect in the loading direction applied. Interestingly, only the monotonic tension caused a significant enhancement of the tensile yield strength as the monotonic tension associated with cyclic torsion caused its reduction. On the other hand, the sizes of subsequent yield surfaces reflecting pre-deformation were reduced in the axial compression direction.

Affiliations:
Kowalewski Z.L. - IPPT PAN
Dubey V.P. - IPPT PAN
Kopeć M. - IPPT PAN
6.  Dubey V.P., Kopeć M., Kowalewski Z.L., An evolution of yield surface for Ti-Cu bimetal after plastic predeformation under complex loading, NTEM 1, Spring School for Young Researchers, New Trends in Experimental Mechanics, 2024-05-13/05-17, Zakopane (PL), pp.1-1, 2024
7.  Kowalewski Z.L., Dubey V.P., Kopeć M., Yield surface determination of CP-Ti and its evolution reflecting prior deformation under complex loading, International Conference on Lightweight Materials and Manufacture, 2023-10-23/10-26, Shenzhen (CN), pp.1-1, 2023
8.  Dubey V.P., Kopeć M., Kowalewski Z.L., An Experimental Investigation of Initial and Subsequent Yield Surfaces of Ti-Cu Bimetallic Structure Under Complex Loadings, KonDokPAN 2023, 7th Conference of Doctoral Students of the PAS, 2023-10-13/10-15, Wrocław (PL), pp.1-1, 2023
9.  Dubey V., Kopeć M., Kowalewski Z.L., YIELD SURFACE IDENTIFICATION OF TITANIUM ALLOY AND ITS EVOLUTION REFLECTING COMPLEX PRE-DEFORMATION, CMM-SolMech 2022, 24th International Conference on Computer Methods in Mechanics; 42nd Solid Mechanics Conference, 2022-09-05/09-08, Świnoujście (PL), pp.1-1, 2022
10.  Dubey V.P., Kopeć M., Kowalewski Z.L., Yield surface identification of Ti-Cu bimetal and its evolution reflecting deformation history under complex loadings, ICEM, 19th International Conference on Experimental Mechanics, 2022-07-17/07-21, Kraków (PL), No.TS1, pp.136-137, 2022
11.  Dubey V.P., Kopeć M., Kowalewski Z.L., The Effect of Predeformation History Under Complex Loading on the Yield Surface Evolution of Titanium Alloy: An Experimental Investigation, IUTAM Symposium, IUTAM Symposium on Enhancing Material Performance by Exploiting Instabilities and Damage Evolution, 2022-06-05/06-10, Warszawa (PL), DOI: 10.24423/iutam2022warsaw, pp.1, 2022
12.  Dubey V.P., Kopeć M., Kowalewski Z.L., Yield Surface Identification of Technically Pure Titanium Alloy and Its Evolution Reflecting Deformation History Under Complex Loadings, ICMPMA, International Conference on Materials: Properties, Measurements, and Application, 2022-05-09/05-13, Kollam (IN), pp.1, 2022

Keywords:
yield surface, pre-deformation, plastic anisotropy, cycle loading

Affiliations:
Dubey V.P. - IPPT PAN
Kopeć M. - IPPT PAN
Kowalewski Z.L. - IPPT PAN
13.  Kopeć M., Dubey V.P., Brodecki A., Kowalewski Z.L., Failure analysis of orthopedic implants, IMPLANTY'2021, III Ogólnopolska Konferencja Naukowa IMPLANTY2021 Koncepcja a realia we współczesnych rozwiązaniach, 2021-06-18/06-18, Gdańsk (PL), pp.1, 2021

Keywords:
medical fixation devices, orthopedicimplants, SEM, fracture analysis, titanium alloy, stainless steel

Affiliations:
Kopeć M. - IPPT PAN
Dubey V.P. - IPPT PAN
Brodecki A. - IPPT PAN
Kowalewski Z.L. - IPPT PAN
14.  Dubey V.P., Kopeć M., Mallick A., Kowalewski Z.L., An effect of enhanced solid solubility on the microstructure and mechanical properties of Al-Cr solid solution by powder metallurgy process, Międzynarodowa Studencka Sesja Naukowa Materiały i Technologie XXI wieku, 2021-05-28/05-28, Gliwice (PL), pp.1, 2021
15.  Dubey V.P., Kopeć M., Kowalewski Z.L., Insight of magnesium matrix nanocomposites for biomedical applications - a synthetic review, XXII Polish Conference on Biocybernetics and Biomedical Engineering, 2021-05-19/05-21, Warszawa (PL), pp.1, 2021

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