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Bäckström, Mikael
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Publications (10 of 76) Show all publications
Zullo, G., Baldoin, E., Koptyug, A., Bäckström, M. & Petrone, N. (2023). Advances in the development of a instrumented head surrogate for brain injury investigation. In: Convegno Nazionale di Bioingegneria: . Paper presented at Convegno Nazionale di Bioingegneria 2023:8th National Congress of Bioengineering, GNB 2023, Padova21 June 2023 through 23 June, 2023. Patron Editore S.r.l.
Open this publication in new window or tab >>Advances in the development of a instrumented head surrogate for brain injury investigation
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2023 (English)In: Convegno Nazionale di Bioingegneria, Patron Editore S.r.l. , 2023Conference paper, Published paper (Refereed)
Abstract [en]

Acquiring knowledge on head traumas is useful since they represent a dangerous outcome of traumatic events. Injury criteria aim to link clinical evidence of injury with experimentally measurable physical quantities, however, recent studies based on numerical methods have pointed out that also other factors could be key contributors to brain injury probability and severity. Providing an experimental measure of more advanced injury criteria is challenging, and only few research groups have started to address the problem. Starting from an existing and validated biofidelic dummy head, advances in the mechanical components and sensors embedded inside the model have been carried out, aiming to improve both bio-fidelity and to address the measure of more advanced criteria. After realizing the prototype, preliminary drop tests were performed impacting the helmeted head over an anvil. Data collected showed increase of injury criteria values with the impact force. Results proved the possibility of using the surrogate for investigating simple and advanced injury criteria, and future works will aim to set test parameters to levels compatible with helmet standards.

Place, publisher, year, edition, pages
Patron Editore S.r.l., 2023
Keywords
head injury, impact test, protective headgear, surrogate head
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-49849 (URN)2-s2.0-85175792307 (Scopus ID)9788855580113 (ISBN)
Conference
Convegno Nazionale di Bioingegneria 2023:8th National Congress of Bioengineering, GNB 2023, Padova21 June 2023 through 23 June, 2023
Available from: 2023-11-14 Created: 2023-11-14 Last updated: 2023-11-14Bibliographically approved
Koptioug, A. & Bäckström, M. (2023). Body Part Surrogates for Medicine, Comfort and Safety Applications. In: Sharma, Ashutosh (Ed.), Advances in 3D Printing: . Rijeka: IntechOpen
Open this publication in new window or tab >>Body Part Surrogates for Medicine, Comfort and Safety Applications
2023 (English)In: Advances in 3D Printing / [ed] Sharma, Ashutosh, Rijeka: IntechOpen , 2023Chapter in book (Refereed)
Abstract [en]

<i>Advances in 3D Printing</i> presents an overview of various types of advances in 3D printing. It discusses current research trends, problems, and applications of 3D printing processes and materials. The book also discusses advances in bioprinting, tissue generation, radiotherapy, and safety issues in health care. It showcases applications of 3D printing in digital design, body part surrogates, rheological models, airway stents, 3D-printed cermets, and more. It also discusses advances in biomimetic nanocomposite materials, intellectual property concerns, and safety issues in 3D printing technology.

Place, publisher, year, edition, pages
Rijeka: IntechOpen, 2023
National Category
Materials Engineering
Identifiers
urn:nbn:se:miun:diva-50826 (URN)10.5772/intechopen.110119 (DOI)978-1-80355-844-8 (ISBN)
Available from: 2024-03-05 Created: 2024-03-05 Last updated: 2024-03-05Bibliographically approved
Koptyug, A., Botero Vega, C. A., Sjöström, W., Bäckström, M., Rännar, L.-E. & Tremsin, A. (2021). Electron Beam Melting: from Shape Freedom to Materials Properties Control at Macro- and Microscale. In: Proceedings of the THERMEC 2020, Graz, Austria: . Paper presented at THERMEC 2020, May, Graz, Austria (pp. 755-759). Trans Tech Publications
Open this publication in new window or tab >>Electron Beam Melting: from Shape Freedom to Materials Properties Control at Macro- and Microscale
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2021 (English)In: Proceedings of the THERMEC 2020, Graz, Austria, Trans Tech Publications, 2021, p. 755-759Conference paper, Published paper (Refereed)
Abstract [en]

Electron beam melting (EBM) is one of the constantly developing powder bed fusion (PBF) additive manufacturing technologies (AM) offering advanced control over the manufacturing process. Freedom of component shapes is one of the AM competitive advantages already used at industrial and semi- industrial scale. Development of the additive manufacturing today is targeting both widening of the available materials classes, and introducing new enabling modalities. Present research is related to the new possibilities in tailoring different material properties within additively manufactured components effectively adding “fourth dimension to the 3D-printing”. Specific examples are given in relation to the electron beam melting, but majority of the conclusions are valid for the laser-based PBF techniques as well. Through manipulating beam energy deposition it is possible to tailor quite different material properties selectively within each manufactured component, including effective material density as well as thermal, mechanical, electrical and acoustic properties. It is also possible to acquire by choice both metal-metal composite and completely alloyed material, when blends of precursor powder are used together with the beam energy manipulation.   

Place, publisher, year, edition, pages
Trans Tech Publications, 2021
Keywords
electron beam melting, material property tailoring, functionalization, microstructure engineering, beam settings manipulation.
National Category
Metallurgy and Metallic Materials Manufacturing, Surface and Joining Technology Composite Science and Engineering Other Engineering and Technologies not elsewhere specified Nano Technology
Identifiers
urn:nbn:se:miun:diva-40797 (URN)10.4028/www.scientific.net/MSF.1016.755 (DOI)2-s2.0-85100893937 (Scopus ID)
Conference
THERMEC 2020, May, Graz, Austria
Projects
Rolf And Gunilla Enstrom's Foundation Project$ Swede- Norway Interreg Project
Available from: 2020-12-17 Created: 2020-12-17 Last updated: 2021-03-02Bibliographically approved
Botero, C. A., Şelte, A., Ramsperger, M., Maistro, G., Koptyug, A., Bäckström, M., . . . Rännar, L.-E. (2021). Microstructural and mechanical evaluation of a cr-mo-v cold-work tool steel produced via electron beam melting (Ebm). Materials, 14(11), Article ID 2963.
Open this publication in new window or tab >>Microstructural and mechanical evaluation of a cr-mo-v cold-work tool steel produced via electron beam melting (Ebm)
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2021 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 14, no 11, article id 2963Article in journal (Refereed) Published
Abstract [en]

In this work, a highly alloyed cold work tool steel, Uddeholm Vanadis 4 Extra, was manufactured via the electron beam melting (EBM) technique. The corresponding material microstructure and carbide precipitation behavior as well as the microstructural changes after heat treatment were characterized, and key mechanical properties were investigated. In the as-built condition, the mi-crostructure consists of a discontinuous network of very fine primary Mo-and V-rich carbides dispersed in an auto-tempered martensite matrix together with ≈15% of retained austenite. Adjusted heat treatment procedures allowed optimizing the microstructure by the elimination of Mo-rich carbides and the precipitation of fine and different sized V-rich carbides, along with a decrease in the retained austenite content below 2%. Hardness response, compressive strength, and abrasive wear properties of the EBM-manufactured material are similar or superior to its as-HIP forged counterparts manufactured using traditional powder metallurgy route. In the material as built by EBM, an impact toughness of 16–17 J was achieved. Hot isostatic pressing (HIP) was applied in order to further increase ductility and to investigate its impact upon the microstructure and properties of the material. After HIPing with optimized protocols, the ductility increased over 20 J. 

Keywords
Additive manufacturing, Carbides, Cold work, Electron beam melting, Hardness, Mechanical properties, Tool steel
National Category
Materials Engineering
Identifiers
urn:nbn:se:miun:diva-42339 (URN)10.3390/ma14112963 (DOI)000660258100001 ()2-s2.0-85107861179 (Scopus ID)
Available from: 2021-06-22 Created: 2021-06-22 Last updated: 2021-06-24Bibliographically approved
Ainegren, M., Michel, F., Klauer, R., Kopyug, A., Bäckström, M., Samuelsson, D., . . . Litzenberger, S. (2020). A Study of Skin-Close Heat and Moisture with Different Types of Backpacks in Cycling. In: Motomu Nakashima, Takeo Maruyama and Yusuke Miyazaki (Ed.), The 13th Conference of the International Sports Engineering Association: . Paper presented at 13th Conference of the International Sports Engineering Association, Tokyo, Japan, May 2020.. MDPI, 49, Article ID 86.
Open this publication in new window or tab >>A Study of Skin-Close Heat and Moisture with Different Types of Backpacks in Cycling
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2020 (English)In: The 13th Conference of the International Sports Engineering Association / [ed] Motomu Nakashima, Takeo Maruyama and Yusuke Miyazaki, MDPI, 2020, Vol. 49, article id 86Conference paper, Published paper (Refereed)
Abstract [en]

The aim of this project was to evaluate effects of backpacks with different design intended for use during cycling on skin-close temperature and relative humidity, oxygen uptake, heart rate and aerodynamic drag. Seven subjects took part in the study cycling on a mountain bike mounted on a “smart trainer” placed on a force plate in a wind tunnel. Three series of experiments were carried out: without backpack, with conventional backpack and with a backpack having innovative rear panel design. As hypothesized, the results showed that an innovatively designed backpack with the ducts deflecting part of the airflow towards some areas of the user’s back provided lower temperature and relative humidity for the microclimate compared to a conventional backpack without airflow channels. Further, reference tests without any backpack resulted in the lowest temperature and humidity. However, no differences were found between the three tests for oxygen uptake, heart rate and aerodynamic drag.

Place, publisher, year, edition, pages
MDPI, 2020
Series
MDPI Proceedings
Keywords
aerodynamic drag, backpack, cycling, microclimate, humidity, temperature, wind tunnel
National Category
Applied Mechanics Fluid Mechanics and Acoustics Sport and Fitness Sciences
Identifiers
urn:nbn:se:miun:diva-40796 (URN)10.3390/proceedings2020049086 (DOI)
Conference
13th Conference of the International Sports Engineering Association, Tokyo, Japan, May 2020.
Projects
Augmented Sports
Available from: 2020-12-17 Created: 2020-12-17 Last updated: 2021-05-05Bibliographically approved
Botero Vega, C. A., Ramsperger, M., Selte, A., Åsvik, K., Koptioug, A., Skoglund, P., . . . Bäckström, M. (2020). Additive Manufacturing of a Cold-Work Tool Steel using Electron Beam Melting. Steel Research International, 19(5), 1-6, Article ID 1900448.
Open this publication in new window or tab >>Additive Manufacturing of a Cold-Work Tool Steel using Electron Beam Melting
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2020 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 19, no 5, p. 1-6, article id 1900448Article in journal (Refereed) Published
Abstract [en]

Metal additive manufacturing (AM) is on its way to industrialization. One of the most promising techniques within this field, electron beam melting (EBM), is nowadays used mostly for the fabrication of high‐performance Ti‐based alloy components for the aerospace and medical industry. Among the industrial applications envisioned for the future of EBM, the fabrication of high carbon steels for the tooling industry is of great interest. In this context, the process windows for dense and crack‐free specimens for a highly alloyed (Cr–Mo–V) cold‐work steel powder are presented in this article. High‐solidification rates during EBM processing lead to very fine and homogeneous microstructures. The influence of process parameters on the resulting microstructure and the chemical composition is investigated. In addition, preliminary results show very promising mechanical properties regarding the as‐built and heat‐treated microstructure of the obtained material.

National Category
Other Materials Engineering
Identifiers
urn:nbn:se:miun:diva-38162 (URN)10.1002/srin.201900448 (DOI)000533428000003 ()2-s2.0-85075934124 (Scopus ID)
Funder
Interreg Sweden-Norway, 20201562
Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2020-07-07Bibliographically approved
Koptyug, A., Bäckström, M. & Olsson, V. (2020). Comparing the Performance of the Biathlon Rifles with Wooden and Titanium Frames. In: Proceedings of The 13th Conference of the International Sports Engineering Association: . Paper presented at 13th Conference of the International Sports Engineering Association [Digital], Tokyo, Japan, May 2020. MDPI, 49(1), Article ID 62.
Open this publication in new window or tab >>Comparing the Performance of the Biathlon Rifles with Wooden and Titanium Frames
2020 (English)In: Proceedings of The 13th Conference of the International Sports Engineering Association, MDPI, 2020, Vol. 49(1), article id 62Conference paper, Published paper (Refereed)
Abstract [en]

The present paper describes preliminary results of studies carried out using a new measurement setup and a biathlon rifle with two different interchangeable stocks: a commercial, mainly wooden one and one additively manufactured from titanium alloy and a polymer PA 2200, employing lightweight, 3D lattice architecture. A finite element analysis of the predicted mechanical properties of new design elements was carried out prior to the manufacturing. Experiments were carried out using a novel setup for the assessment of athlete and rifle performance in biathlon shooting. Data acquisition was carried out at the rates of few kilosamples per second, using a combination of an airbag-based rifle butt pressure sensor, a trigger loading sensor, strap load cell, and two tri-axis MEMS sensors—an accelerometer and a gyroscope. All tests indicate that a rifle stock additively manufactured from titanium alloy could provide better recoil damping compared to the commercial, mainly wooden one. Together with the high capacity of additive manufacturing technologies in equipment individualization, this may provide additional possibilities for the improvement of sports rifle construction and help athletes achieve better results in competitions.

Place, publisher, year, edition, pages
MDPI, 2020
Series
MDPI Proceedings
Keywords
biathlon rifle, shooting dynamics, recoil, sensors, additive manufacturing
National Category
Other Mechanical Engineering Sport and Fitness Sciences
Identifiers
urn:nbn:se:miun:diva-40795 (URN)10.3390/proceedings2020049062 (DOI)
Conference
13th Conference of the International Sports Engineering Association [Digital], Tokyo, Japan, May 2020
Projects
Augmented Sports
Available from: 2020-12-17 Created: 2020-12-17 Last updated: 2020-12-28Bibliographically approved
Koptioug, A., Popov, V. V. ., Botero Vega, C. A., Jiménez-Piqué, E., Katz-Demyanetz, A., Rännar, L.-E. & Bäckström, M. (2020). Compositionally-tailored steel-based materials manufactured by electron beam melting using blended pre-alloyed powders. Materials Science & Engineering: A, 771, Article ID 138587.
Open this publication in new window or tab >>Compositionally-tailored steel-based materials manufactured by electron beam melting using blended pre-alloyed powders
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2020 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 771, article id 138587Article in journal (Refereed) Published
Abstract [en]

The paper presents the prospects of additive manufacturing (AM) in metal, using the powder bed fusion (PBF) method Electron Beam Melting (EBM) in fabrication specific steel-based alloys for different applications. The proposed approach includes manufacturing of metals from blended pre-alloyed powders for achieving in situ alloying and the material microstructure tailoring by controlling electron beam energy deposition rate EBM tests were conducted with the blends of 316L stainless steel and Colferoloys 103 and 139, corrosion- and abrasion-resistant iron based materials commonly used for plasma spray coating. Thorough microstructure analysis of the manufactured sample was carried out using electron microscopy and measurements of microhardness and elastic modulus was carried out using nanoindentation. It is concluded that implementation of blended powder pathway in PBF AM allows to widen the scope of available materials through diminishing the dependence on the availability of pre-alloyed powders. Together with beam energy steering this pathway also allows for an effective sample microstructure control at different dimensional scales, resulting in components with unique properties. Therefore, the implementation of ‘blended powder pathway’ in PBF AM provides a possibility of manufacturing components with the composite-like and homogeneous zones allowing for the microstructure control and effectively adding a “4th dimension” to “3D printing". 

Keywords
Additive manufacturing, Blended powder, EBM, Electron beam melting, Graded material, In situ alloying
National Category
Materials Engineering
Identifiers
urn:nbn:se:miun:diva-37689 (URN)10.1016/j.msea.2019.138587 (DOI)000503324700020 ()2-s2.0-85074019741 (Scopus ID)
Available from: 2019-11-15 Created: 2019-11-15 Last updated: 2020-01-16Bibliographically approved
Botero, C., Bäckström, M., Rännar, L.-E., Roos, S., Koptyug, A., Åsvik, K., . . . Ramsperger, M. (2019). Additive Manufacturing of a cold work steel using Electron Beam Melting. In: Proceedings of Conference:  Tooling 2019: . Paper presented at Tooling 2019, Aachen, May 2019. , May
Open this publication in new window or tab >>Additive Manufacturing of a cold work steel using Electron Beam Melting
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2019 (English)In: Proceedings of Conference:  Tooling 2019, 2019, Vol. MayConference paper, Oral presentation with published abstract (Refereed)
Keywords
Additive Manufacturing, steel, Electron Beam Melting
National Category
Other Engineering and Technologies not elsewhere specified Metallurgy and Metallic Materials Other Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-37955 (URN)
Conference
Tooling 2019, Aachen, May 2019
Available from: 2019-12-11 Created: 2019-12-11 Last updated: 2021-12-15Bibliographically approved
Petrone, N., Candiotto, G., Marzella, E., Uriati, F., Carraro, G., Bäckström, M. & Koptyug, A. (2019). Feasibility of using a novel instrumented human head surrogate to measure helmet, head and brain kinematics and intracranial pressure during multidirectional impact tests. Journal of Science and Medicine in Sport, 22(S1), S78-S84
Open this publication in new window or tab >>Feasibility of using a novel instrumented human head surrogate to measure helmet, head and brain kinematics and intracranial pressure during multidirectional impact tests
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2019 (English)In: Journal of Science and Medicine in Sport, ISSN 1440-2440, E-ISSN 1878-1861, Vol. 22, no S1, p. S78-S84Article in journal (Refereed) Published
Abstract [en]

Objectives: Aim of the work is to present the feasibility of using an Instrumented Human Head Surrogate (IHHS-1) during multidirectional impacts while wearing a modern ski helmet. The IHHS-1 is intended to provide reliable and repeatable data for the experimental validation of FE models and for the experimental evaluation of modern helmets designed to enhance the degree of protection against multidirectional impacts. Design: The new IHHS-1 includes 9 triaxial MEMS accelerometers embedded in a silicone rubber brain, independently molded and presenting lobes separation and cerebellum, placed into an ABS skull filled with surrogate cerebrospinal fluid. A triaxial MEMS gyroscope is placed at the brain center of mass. Intracranial pressure can be detected by eight pressure sensors applied to the skull internal surface along a transversal plane located at the brain center of mass and two at the apex. Additional MEMS sensors positioned over the skull and the helmet allow comparison between outer and inner structure kinematics and surrogate CSF pressure behavior. Methods: The IHHS-1 was mounted through a Hybrid III neck on a force platform and impacted with a striker connected to a pendulum tower, with the impact energies reaching 24J. Impact locations were aligned with the brain center of mass and located in the back (sagittal axis), right (90° from sagittal axis), back/right (45°), and front right (135°) locations. Following dynamic data were collected: values of the linear accelerations and angular velocities of the brain, skull and helmet; intracranial pressures inside the skull. Results: Despite the relatively low intensity of impacts (HIC at skull max value 46), the skull rotational actions reached BrIC values of 0.33 and angular accelerations of 5216 rad/s2, whereas brain angular acceleration resulted between 1,44 and 2,1 times lower with similar values of BrIC. Conclusions: The IHHS-1 is a physical head surrogate that can produce repeatable data for the interpretation of inner structures behavior during multidirectional impacts with or without helmets of different characteristics. 

Keywords
Accelerometers, Angular velocity, Helmet evaluation, Human head, Intracranial pressure, Surrogate
National Category
Materials Engineering
Identifiers
urn:nbn:se:miun:diva-36704 (URN)10.1016/j.jsams.2019.05.015 (DOI)000493587000016 ()31272916 (PubMedID)2-s2.0-85068078314 (Scopus ID)
Available from: 2019-07-10 Created: 2019-07-10 Last updated: 2020-02-20Bibliographically approved
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