Karol Golasiński, M.Sc., Eng.

Department of Experimental Mechanics (ZMD)
Division of Applied Thermomechanics (PTS)
position: doctoral student
telephone: (+48) 22 826 12 81 ext.: 366
room: 040
e-mail: kgolasin

Recent publications
1.Bollero A., Rial J., Villanueva M., Golasiński K.M., Seoane A., Almunia J., Altimira R., Recycling of Strontium Ferrite Waste in a Permanent Magnet Manufacturing Plant, ACS Sustainable Chemistry & Engineering, ISSN: 2168-0485, DOI: 10.1021/acssuschemeng.6b03053, Vol.5, No.4, pp.3243-3249, 2017
Abstract:

Residues resulting from the manufacture of strontium ferrite magnets have been recycled for further use in magnet fabrication instead of disposal as waste. The quality of the recycled ferrite powder has been tested and compared to that of the new starting ferrite material. The magnetic properties of the recycled powder not only match those of the starting material acquired by the company for the production of magnets but exceed them. A coercivity value 3.5 times larger than that of the new starting ferrite powder, accompanied by a 25% increase in remanence, makes this material a new and improved ferrite product to re-enter the production chain in the factory with an extended applications range. This improvement is proven to be due to tuning of the morphology and microstructure through processing and subsequent heat treatment. The use of processing conditions in the same range as those typically used in the preparation of ferrite powders and magnets, in combination with the superior magnetic quality of the resulting powders, makes this method a suitable path to guarantee sustainability and an efficient use of resources in permanent magnet companies.

Keywords:

Ferrites, Permanent magnets; Recovery; Recycling; Sustainability

Affiliations:
Bollero A.-IMDEA Nanoscience (ES)
Rial J.-IMDEA Nanoscience (ES)
Villanueva M.-IMDEA Nanoscience (ES)
Golasiński K.M.-other affiliation
Seoane A.-Ingeniería Magnética Aplicada (ES)
Almunia J.-Ingeniería Magnética Aplicada (ES)
Altimira R.-Ingeniería Magnética Aplicada (ES)
2.Pieczyska E.A., Staszczak M., Kowalczyk-Gajewska K., Maj M., Golasiński K., Golba S., Tobushi H., Hayashi S., Experimental and numerical investigation of yielding phenomena in a shape memory polymer subjected to cyclic tension at various strain rates, POLYMER TESTING, ISSN: 0142-9418, DOI: 10.1016/j.polymertesting.2017.04.014, Vol.60, pp.333-342, 2017
Abstract:

This paper presents experimental and numerical results of a polyurethane shape memory polymer (SMP) subjected to cyclic tensile loading. The goal was to investigate the polymer yielding phenomena based on the effects of thermomechanical coupling. Mechanical characteristics were obtained with a testing machine, whereas the SMP temperature accompanying its deformation process was simultaneously measured in a contactless manner with an infrared camera. The SMP glass transition temperature was approximately 45oC; therefore, when tested at room temperature, the polymer is rigid and behaves as solid material. The stress and related temperature changes at various strain rates showed how the SMP yield limit evolved in subsequent loading-unloading cycles under various strain rates. A two-phase model of the SMP was applied to describe its mechanical response in cyclic tension. The 3D Finite Element model of a tested specimen was used in simulations. Good agreement between the model predictions and experimental results was observed for the first tension cycle.

Keywords:

Shape memory polymer, Tension cyclic loading, Thermomechanical coupling, Yield limit, Thermoelastic effect, Constitutive model

Affiliations:
Pieczyska E.A.-IPPT PAN
Staszczak M.-IPPT PAN
Kowalczyk-Gajewska K.-IPPT PAN
Maj M.-IPPT PAN
Golasiński K.-IPPT PAN
Golba S.-University of Silesia (PL)
Tobushi H.-Aichi Institute of Technology (JP)
Hayashi S.-SMP Technologies Inc. (JP)
3.Guzik M.N., Golasiński K.M., Pedrosa F.J., Jenuš P., Bollero A., Hauback B.C., Deledda S., Influence of ultra-short cryomilling on the microstructural andmagnetic properties of cobalt ferrite, JOURNAL OF ALLOYS AND COMPOUNDS, ISSN: 0925-8388, DOI: 10.1016/j.jallcom.2017.05.290, Vol.721, pp.440-448, 2017
Abstract:

The impact of ultra-short milling at liquid nitrogen temperatures on structural and magnetic properties of cobalt ferrite (CoFe2O4) powders has been explored for the first time. Cryomilling for only up to 9 min increases the coercivity of the isotropic powder from 139 to 306 kA/m (1.74–3.85 kOe) and results in its modifications comparable with milling for hours at room temperature. A thermal treatment of processed CoFe2O4 enables further optimization of powder magnetic properties and leads to a high value of energy product (13.5 kJ/m3) for the sample treated at 600 °C. Systematic studies, comprising analysis of structural and microstructural properties, based on synchrotron powder X-ray diffraction, scanning and transmission electron microscopy demonstrate the high efficiency of cryomilling in reduction of crystallite sizes and formation of lattice strain in the processed cobalt ferrite samples.

Keywords:

Cryomilling, Cobalt ferrite, Magnetic properties

Affiliations:
Guzik M.N.-Institute for Energy Technology (NO)
Golasiński K.M.-other affiliation
Pedrosa F.J.-IMDEA Nanoscience (ES)
Jenuš P.-Jozef Stefan Institute (SI)
Bollero A.-IMDEA Nanoscience (ES)
Hauback B.C.-Institute for Energy Technology (NO)
Deledda S.-Institute for Energy Technology (NO)
4.Golasiński K.M., Pieczyska E.A., Staszczak M., Maj M., Furuta T., Kuramoto S., Infrared thermography applied for experimental investigation of thermomechanical couplings in Gum Metal, Quantitative InfraRed Thermography Journal, ISSN: 1768-6733, DOI: 10.1080/17686733.2017.1284295, pp.1-8, 2017
Abstract:

Results of initial investigation of thermomechanical couplings in innovative β-Ti alloy called Gum Metal subjected to tension are presented. The experimental set-up, consisting of testing machine and infrared camera, enabled to obtain stress–strain curves with high accuracy and correlate them to estimated temperature changes of the specimen during the deformation process. Both ultra-low elastic modulus and high strength of Gum Metal were confirmed. The infrared measurements determined average and maximal temperature changes accompanying the alloy deformation process, allowed to estimate thermoelastic effect, which is related to the alloy yield point. The temperature distributions on the specimen surface served to analyse strain localization effects leading to the necking and rupture.

Keywords:

Gum Metal, thermomechanical coupling, nonlinear elasticity, yield point, infrared camera

Affiliations:
Golasiński K.M.-IPPT PAN
Pieczyska E.A.-IPPT PAN
Staszczak M.-IPPT PAN
Maj M.-IPPT PAN
Furuta T.-Toyota Central Research & Development Laboratories (JP)
Kuramoto S.-Ibaraki University Japan (JP)
5.Pieczyska E.A., Staszczak M., Maj M., Kowalczyk-Gajewska K., Golasiński K., Cristea M., Tobushi H., Hayashi S., Investigation of thermomechanical couplings, strain localization and shape memory properties in a shape memory polymer subjected to loading at various strain rates, SMART MATERIALS AND STRUCTURES, ISSN: 0964-1726, DOI: 10.1088/0964-1726/25/8/085002, Vol.25, No.8, pp.085002-1-15, 2016
Abstract:

This paper presents experimental and modeling results of the effects of thermomechanical couplings occurring in a polyurethane shape memory polymer (SMP) subjected to tension at various strain rates within large strains. The SMP mechanical curves, recorded using a testing machine, and the related temperature changes, measured in a contactless manner using an IR camera, were used to investigate the polymer deformation process at various loading stages. The effects of thermomechanical couplings allowed the determination of the material yield point in the initial loading stage, the investigation of nucleation and development of the strain localization at larger strains and the estimation of the effects of thermoelastic behavior during the unloading process. The obtained stress–strain and thermal characteristics, the results of the dynamic mechanical analysis and estimated values of the shape fixity and shape recovery parameters confirmed that the shape memory polymer (T g = 45°C) is characterized by good mechanical and shape memory properties, as well as high sensitivity to the strain rate. The mechanical response of the SMP subjected to tension was simulated using the finite element method and applying the large strain, two-phase model. Strain localization observed in the experiment was well reproduced in simulations and the temperature spots were correlated with the accumulated viscoplastic deformation of the SMP glassy phase.

Keywords:

shape memory polymer, thermomechanical coupling, infrared camera, tension test, strain rate, strain localization, constitutive model

Affiliations:
Pieczyska E.A.-IPPT PAN
Staszczak M.-IPPT PAN
Maj M.-IPPT PAN
Kowalczyk-Gajewska K.-IPPT PAN
Golasiński K.-IPPT PAN
Cristea M.-Petru Poni Institute of Macromolecular Chemistry (RO)
Tobushi H.-Aichi Institute of Technology (JP)
Hayashi S.-SMP Technologies Inc. (JP)
6.Pedrosa F.J., Rial J., Golasiński K.M., Guzik M.N., Quesada A., Fernández J.F., Deledda S., Camarero J., Bollero A., Towards high performance CoFe2O4 isotropic nanocrystalline powder for permanent magnet applications, APPLIED PHYSICS LETTERS, ISSN: 0003-6951, DOI: 10.1063/1.4969064, Vol.109, No.22, pp.223105-1-4, 2016
Abstract:

We report on a comparative study of high performance isotropic cobalt ferrite (CoFe2O4) powder processed by dry and surfactant assisted (wet) ball milling. Milling times as short as 1.5 min (dry) and 6 min (wet) have resulted in a 4-fold increase in coercivity, with a maximum achieved value above 318 kA/m (4 kOe). The use of surfactant is shown to be advantageous in the formation of a more homogeneous structure constituted by non-agglomerated and strained nanoparticles. A record (BH) max value of 18.6 kJ m −3 (2.34 MGOe) has been obtained for isotropic powder after post-processing annealing. This magnetic performance combined with the required short processing times and the unnecessary requirement of oxygen avoidance in the milling process, makes this CoFe2O4 powder a good candidate for permanent magnet applications.

Keywords:

Milling, Nanopowders, Powders, Coercive force, Surfactants

Affiliations:
Pedrosa F.J.-IMDEA Nanoscience (ES)
Rial J.-IMDEA Nanoscience (ES)
Golasiński K.M.-other affiliation
Guzik M.N.-Institute for Energy Technology (NO)
Quesada A.-Institute of Ceramics and Glass (ES)
Fernández J.F.-Instituto de Ceramica y Vidrio (IT)
Deledda S.-Institute for Energy Technology (NO)
Camarero J.-IMDEA Nanoscience (ES)
Bollero A.-IMDEA Nanoscience (ES)
7.Pedrosa F.J., Rial J., Golasiński K.M., Rodriguez Osorio M., Salas G., Granados D., Camarero J., Bollero A., Tunable nanocrystalline CoFe2O4 isotropic powders obtained by co-precipitation and ultrafast ball milling for permanent magnet applications, RSC Advances, ISSN: 2046-2069, Vol.6, pp.87282-87287, 2016
Abstract:

Synthesis of nanocrystalline Co-ferrite powders with tunable magnetic
properties is demonstrated by using co-precipitation and a novel
ultrafast milling route. Milling times as short as a few minutes are re-
ported for the first time to be sufficient to refine microstructure and to
induce microstrain, and act efficiently, providing a 5-fold increase in
coercivity. This is achieved with no compositional change during
processing, but exclusively through microstructural modification. The
efficiency of this process and its feasible scalability pave the way for
development of Co-ferrite powders for permanent magnet applications.

Affiliations:
Pedrosa F.J.-IMDEA Nanoscience (ES)
Rial J.-IMDEA Nanoscience (ES)
Golasiński K.M.-other affiliation
Rodriguez Osorio M.-IMDEA Nanoscience (ES)
Salas G.-Campus Universidad Autònoma de Madrid (ES)
Granados D.-IMDEA Nanoscience (ES)
Camarero J.-IMDEA Nanoscience (ES)
Bollero A.-IMDEA Nanoscience (ES)

Conference abstracts
1.Pieczyska E.A., Golasiński K., Staszczak M., Maj M., Furuta T., Kuramoto S., A thermomechanical analysis of high elasto-plastic properties of gum metal at various strain rates, M2D, 7th International Conference on Mechanics and Materials in Design, 2017-06-11/06-15, Albufeira (PT), No.7002, pp.131-132, 2017
Abstract:

Mechanical characteristics obtained by MTS testing machine and digital image correlation (DIC) algorithm as well as the related temperature changes in a new B-Ti alloy - Gum Metal, subjected to tension in a wide spectrum of the strain rates, are presented The fast and sensitive infrared camera ThermaCam Phoenix allowed estimating temperature changes accompanying the specimen deformation process in contactless manner. The obtained mechanical curves confirm an ultra-low elastic modulus and high strength of Gum Metal. Furthermore, it was presented how the stress-strain characteristics change from hardening to softening depending on the strain rate. The thermoelastic effect, estimated by the IR technique was discussed according to the Gum Metal yield point.

Keywords:

gum metal, titanium alloy, tension test, strain rate, thermomechanical coupling

Affiliations:
Pieczyska E.A.-IPPT PAN
Golasiński K.-IPPT PAN
Staszczak M.-IPPT PAN
Maj M.-IPPT PAN
Furuta T.-Toyota Central Research & Development Laboratories (JP)
Kuramoto S.-Ibaraki University Japan (JP)
2.Pieczyska E., Golasiński K., Staszczak M., Maj M., Furuta T., Kuramoto S., High elasto-plastic properties of new titanium alloy gum metal in wide spectra of the strain rates, 17th International Conference on Experimental Mechanics, 2016-07-03/07-07, Rhodes (GR), No.388, pp.1-2, 2016
Abstract:

Results of investigation of mechanical properties and the related temperature changes in a β-Ti alloy, Gum Metal, subjected to tension in a wide spectrum of the strain rates are presented. The stress-strain curves have been obtained by MTS testing machine while fast and sensitive infrared camera Phoenix Flir Co. allowed estimating temperature changes accompanying the specimen deformation process. The obtained mechanical curves confirm an ultra- low elastic modulus and high strength of Gum Metal. The yield point was estimated with high accuracy basing on the thermoelastic effect measured by the advanced infrared technique. Furthermore, it was observed that the stress-strain characteristics change from hardening to softening beyond the Yield point depending on the strain rate applied.

Keywords:

Gum metal, Titanium alloy, Superelastic nonlinear properties, strain rate

Affiliations:
Pieczyska E.-IPPT PAN
Golasiński K.-IPPT PAN
Staszczak M.-IPPT PAN
Maj M.-IPPT PAN
Furuta T.-Toyota Central Research & Development Laboratories (JP)
Kuramoto S.-Ibaraki University Japan (JP)
3.Pieczyska E.A., Golasiński K., Staszczak M., Maj M., Furuta T., Kuramoto S., Gum metal subjected to cyclic tension loading analysed by fast and sensitive infrared camera, ICMFM18, XVIII International Colloquium MECHANICAL FATIGUE OF METALS, 2016-09-05/09-07, Gijón (ES), pp.1, 2016
Abstract:

Gum Metal, a new multifunctional titanium alloy combining high elasticity of rubber and strength of metal, has been mechanically and thermomechanically tested. The subsequent tension deformation cycles have been conducted. At the strain rate of 10-2s-1 and step of 0.005 - 37 loading-unloading cycles until rupture were performed. Comparison of stress and temperature changes vs. strain for 2nd, 20th and 36th loading-unloading cycles is discussed.

Keywords:

Gum Metal, cyclic loading, infrared camera, thermomechanical coupling

Affiliations:
Pieczyska E.A.-IPPT PAN
Golasiński K.-IPPT PAN
Staszczak M.-IPPT PAN
Maj M.-IPPT PAN
Furuta T.-Toyota Central Research & Development Laboratories (JP)
Kuramoto S.-Ibaraki University Japan (JP)
4.Golasiński K., Pieczyska E., Maj M., Staszczak M., Takesue N., Investigation of Gum Metal under compressive cyclic loading, Plastmet 2016, Jubileuszowe X Seminarium Naukowe ZINTEGROWANE STUDIA PODSTAW DEFORMACJI PLASTYCZNEJ METALI , 2016-11-22/11-25, Łańcut (PL), pp.41-42, 2016
Abstract:

Preliminary results of mechanical behavior of Gum Metal compressed along the swaging direction during cyclic loading were presented. The unique mechanical performance of Gum Metal - low Young’s Modulus and high strength were confirmed. During the cyclic loading the curves profiles change significantly with each cycle and reveal a clearly pronounced yield points for the 4th and further cycles. Compression tests along perpendicular direction to the swaging one will be considered for our future research.

Keywords:

Gum Metal, polycrystal, compression loading, cyclic loading, digital image correlation

Affiliations:
Golasiński K.-IPPT PAN
Pieczyska E.-IPPT PAN
Maj M.-IPPT PAN
Staszczak M.-IPPT PAN
Takesue N.-Fukuoka University (JP)
5.Golasiński K., Pieczyska E., Staszczak M., Maj M., Furuta T., Kuramoto S., Infrared thermography applied for experimental investigation of thermomechanical couplings in Gum Metal, QIRT 2016, XIII International Quantitative InfraRed Thermography Conference, 2016-06-04/06-08, Gdańsk (PL), pp.318-319, 2016
Abstract:

Results of investigation of thermomechanical couplings in innovative β-Ti alloy (Gum Metal) subjected to tension are presented. The experimental set-up, consisting of testing machine and infrared camera, enabled to obtain stress-strain curves with high accuracy and correlate them to estimated temperature changes of the sample during the deformation process. Both ultra-low elastic modulus and high strength of Gum Metal were confirmed. The infrared measurements determined average and maximal temperature changes accompanying the alloy deformation process, allowed to estimate thermoelastic effect, which is related to the alloy yield point. The temperature distributions on the sample surface served to analyze localization effects leading to the sample necking and rupture.

Keywords:

Gum metal, nonlinear elasticity, thermomechanical couplings

Affiliations:
Golasiński K.-IPPT PAN
Pieczyska E.-IPPT PAN
Staszczak M.-IPPT PAN
Maj M.-IPPT PAN
Furuta T.-Toyota Central Research & Development Laboratories (JP)
Kuramoto S.-Ibaraki University Japan (JP)
6.Golasiński K., Pieczyska E., Staszczak M., Maj M., Furuta T., Kuramoto S., Thermomechanical behavior of gum metal under cyclic loading, SolMech 2016, 40th Solid Mechanics Conference, 2016-08-29/09-02, Warszawa (PL), No.P208, pp.1-2, 2016
Abstract:

This work presents thermomechanical characterization of a new multifunctional class of β-Ti alloy called Gum Metal subjected to cyclic tensile loading. Being developed in the Toyota Central R&D Laboratory (CRDL), Gum Metal has attracted remarkable attention due to its exceptional properties, i.e. low elastic modulus, high strength, nonlinear elastic deformation, excellent cold workability as well as Invar- and Elinvar-like behavior. Typical composition of Gum Metal is Ti-Nb-Ta-Zr-O, where oxygen content plays a key role. Its fabrication route consists of powder metallurgy forging method with subsequent cold working usually up to 90% in area reduction. The latter is critical for the unique mechanical performance but deformation mechanisms occurring in Gum Metal are unconventional and still unclear.

Keywords:

Gum metal, cyclic loading, titanium alloy, thermomechanical behavior

Affiliations:
Golasiński K.-IPPT PAN
Pieczyska E.-IPPT PAN
Staszczak M.-IPPT PAN
Maj M.-IPPT PAN
Furuta T.-Toyota Central Research & Development Laboratories (JP)
Kuramoto S.-Ibaraki University Japan (JP)
7.Golasiński K., Pieczyska E., Staszczak M., Furuta T., Kuramoto S., Thermomechanical Investigation of Gum Metal – a New Innovative Titanium Alloy for Biomedical Applications, The 10th International Congress of Societas Humboldtiana Polonorum “Longevity - a blessing or a curse”, 2016-06-30/07-02, Łódź (PL), pp.43, 2016
Keywords:

Gum metal, biomedical application, superelastic properties

Affiliations:
Golasiński K.-IPPT PAN
Pieczyska E.-IPPT PAN
Staszczak M.-IPPT PAN
Furuta T.-Toyota Central Research & Development Laboratories (JP)
Kuramoto S.-Ibaraki University Japan (JP)