lnu.sePublications
Change search
Link to record
Permanent link

Direct link
Publications (10 of 44) Show all publications
Pepitone, K., Kirby, G., Olvegard, M., Ahl, A., Almström, M., Dugic, I., . . . Ruber, R. (2023). Design and Fabrication of a Canted-Cosine-Theta Double Aperture Orbit Corrector Dipole for the LHC. IEEE transactions on applied superconductivity (Print), 33(5), Article ID 4000405.
Open this publication in new window or tab >>Design and Fabrication of a Canted-Cosine-Theta Double Aperture Orbit Corrector Dipole for the LHC
Show others...
2023 (English)In: IEEE transactions on applied superconductivity (Print), ISSN 1051-8223, E-ISSN 1558-2515, Vol. 33, no 5, article id 4000405Article in journal (Refereed) Published
Abstract [en]

A prototype CCT dipole magnet developed by a collaboration between Swedish universities, Swedish industry and CERN will be tested at Uppsala University. This 1 m long double-aperture magnet can provide a field strength of 3.3 T at 85 A in a 70 mm aperture with an integrated field of 2.8 Tm. It is intended to replace the current LHC orbit corrector magnets which are reaching the end of their expected life due to the radiation load. The new magnet is designed to handle the radiation dose of the upgrade to the high-luminosity LHC, which will deliver about ten times the current radiation dose. It must therefore be more resistant to radiation and meet strict requirements in terms of electrical insulation while matching the original field quality and self-protective capability, mechanical volume, and maximum excitation current. This paper will present the latest of the design and manufacturing work, including the results of simulations of the mechanical field and the mechanical stress. Details of the various tests performed before machining the parts are also presented.

Place, publisher, year, edition, pages
IEEE, 2023
National Category
Accelerator Physics and Instrumentation
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-119505 (URN)10.1109/tasc.2023.3241571 (DOI)000936059300011 ()2-s2.0-85148414472 (Scopus ID)
Funder
European Regional Development Fund (ERDF)
Available from: 2023-02-22 Created: 2023-02-22 Last updated: 2023-04-06Bibliographically approved
Dugic, I. (2023). How to Prevent Porosity Defects in Steel Casting Component. In: Wagstaff, S., Anderson, A., Sabau, A.S. (Ed.), Materials Processing Fundamentals 2023. TMS 2023: . Paper presented at TMS 2023. Springer
Open this publication in new window or tab >>How to Prevent Porosity Defects in Steel Casting Component
2023 (English)In: Materials Processing Fundamentals 2023. TMS 2023 / [ed] Wagstaff, S., Anderson, A., Sabau, A.S., Springer, 2023Conference paper, Published paper (Refereed)
Abstract [en]

The production of steel casting can in some cases be complicated and difficult. To produce quality castings, it requires the casting to be clean and free from any defects. One of the main casting defects is hot tearing, also known as a crack or shortness. This phenomenon represents the formation of an irreversible failure (crack) in the steel semisolid casting. The second defect that commonly occurs in casting is porosity. Porosity is often used to describe any void or hole found in a casting. To control the porosity, you need to understand its sources and causes. Porosity can occur either by gas formation, solidification shrinkage, or non-metallic compound formation, all while the metal is liquid. This experimental work is focused on reducing the porosity defects in steel casting components at a production scale. The produced casting component was strongly affected by porosity defects.

Place, publisher, year, edition, pages
Springer, 2023
Series
The Minerals, Metals & Materials Series, ISSN 2367-1181, E-ISSN 2367-1696
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-126099 (URN)10.1007/978-3-031-22657-1_8 (DOI)9783031226564 (ISBN)9783031226571 (ISBN)
Conference
TMS 2023
Available from: 2023-12-20 Created: 2023-12-20 Last updated: 2024-01-11Bibliographically approved
Pepitone, K., Kirby, G., Ruber, R., Ahl, A., Canale, M., Dugic, I., . . . Olvegård, M. (2022). Design of a Canted-Cosine-Theta Orbit Corrector for the High Luminosity LHC. IEEE transactions on applied superconductivity (Print), 32(6), Article ID 4003104.
Open this publication in new window or tab >>Design of a Canted-Cosine-Theta Orbit Corrector for the High Luminosity LHC
Show others...
2022 (English)In: IEEE transactions on applied superconductivity (Print), ISSN 1051-8223, E-ISSN 1558-2515, Vol. 32, no 6, article id 4003104Article in journal (Refereed) Published
Abstract [en]

The High Luminosity LHC requires dipole orbit correctors grouped in double aperture magnet assemblies. They provide a field of 3.1 T at 100 A in an aperture of 70 mm. The current standard design is a classical cosine-theta layout made with ribbon cable. However, the electric insulation of this cable is not radiation-resistant enough to withstand the radiation load expected in the coming years of LHC operation. A new design, based on a cable with polyimide insulator, that can replace the existing orbit correctors, is needed. The challenge is to design a magnet that fits directly into the existing positions and that can operate with the same busbars, passive quench protection, and power supplies. The new orbit corrector design meets high requirements on the field quality while keeping within the same mechanical volume and maximum excitation current. A collaboration of Swedish universities and Swedish industry has been formed for the development and production of a prototype magnet following a concurrent engineering methodology to reduce the time needed to produce a CCT magnet. The magnet has a 1 m long CCT dipole layout consisting of two coils. The superconductor is a commercially available 0.33 mm wire with polyimide insulation in a 6-around-1 cable. The channels in the coil formers, that determine the CCT layout, allow for 2 x 5 cable layers. A total of 70 windings makes that the coil current can be kept below 100 A. We will present the detailed design and preliminary quench simulations.

Place, publisher, year, edition, pages
IEEE, 2022
Keywords
Accelerator magnet, canted-cosine-theta, quench protection
National Category
Accelerator Physics and Instrumentation
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-111553 (URN)10.1109/TASC.2022.3154334 (DOI)000777330900014 ()2-s2.0-85125696778 (Scopus ID)2022 (Local ID)2022 (Archive number)2022 (OAI)
Available from: 2022-04-21 Created: 2022-04-21 Last updated: 2023-05-02Bibliographically approved
Dugic, I. (2022). Microscopic investigation of test specimen 2 after thermal shock test.
Open this publication in new window or tab >>Microscopic investigation of test specimen 2 after thermal shock test
2022 (English)Report (Other academic)
Abstract [en]

Microscopic investigation

Publisher
p. 10
Keywords
Microscopic, investigation, specimen
National Category
Mechanical Engineering
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-110922 (URN)
Projects
Kompetens- och teknikspridning om kalla magneter för tillgång till en breddad internationell marknad
Funder
European Regional Development Fund (ERDF)
Note

Ej belagd 220323

Available from: 2022-03-21 Created: 2022-03-21 Last updated: 2023-04-06Bibliographically approved
Dugic, I. (2021). Microscopic investigation of the test specimen after the thermal shock test. Växjö: Linnéuniverstitetet. Institutionen för maskinteknik
Open this publication in new window or tab >>Microscopic investigation of the test specimen after the thermal shock test
2021 (English)Report (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Växjö: Linnéuniverstitetet. Institutionen för maskinteknik, 2021. p. 13
Keywords
Microscopy, cracks
National Category
Mechanical Engineering
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-108641 (URN)
Funder
Swedish Agency for Economic and Regional Growth, 20292704
Available from: 2021-12-16 Created: 2021-12-16 Last updated: 2023-01-11Bibliographically approved
Dugic, I. (2020). How to Prevent Gas Porosity Defects in Castings of Stator Housing in Grey Cast Iron. In: Peng Z.,Hwang J.-Y.,Downey J.,Gregurek D.,Zhao B.,Yucel O.,Keskinkilic E.,Jiang T.,White J.,Mahmoud M. (Ed.), TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings: . Paper presented at 149th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2020; San Diego; United States; 23 February 2020 through 27 February 2020 (pp. 1139-1148). Springer
Open this publication in new window or tab >>How to Prevent Gas Porosity Defects in Castings of Stator Housing in Grey Cast Iron
2020 (English)In: TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings / [ed] Peng Z.,Hwang J.-Y.,Downey J.,Gregurek D.,Zhao B.,Yucel O.,Keskinkilic E.,Jiang T.,White J.,Mahmoud M., Springer, 2020, p. 1139-1148Conference paper, Published paper (Refereed)
Abstract [en]

Grey cast iron is one of the easiest metals to cast in a foundry, and of ferrous metals, it has the lowest pouring temperature, high fluidity, and very low shrinkage during the transformation from the liquid to solid phase. One of the disadvantages of this grade of cast iron is the presence of the different types of defects produced in green sand casting. Cast defects are, at a higher proportion, caused by evolution of gases. Pinholes and blowholes are major casting defects caused by gases. This experimental work has focused on reducing gas defects on casting component, stator housing, at a production scale using the green sand casting process. The casting component produced was strongly affected by gas defects. A series of simulations were performed using the casting simulation program MAGMASOFT® in order to investigate the solidification characteristics as well as the porosity formation in the casting component.

Place, publisher, year, edition, pages
Springer, 2020
Series
Minerals, Metals and Materials Series, E-ISSN 2367-1181
National Category
Mechanical Engineering
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-103390 (URN)10.1007/978-3-030-36296-6_106 (DOI)000674707900106 ()2-s2.0-85081395158 (Scopus ID)9783030362959 (ISBN)
Conference
149th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2020; San Diego; United States; 23 February 2020 through 27 February 2020
Available from: 2021-05-11 Created: 2021-05-11 Last updated: 2023-01-11Bibliographically approved
Dugic, I. (2019). Effect of Casting Temperature on the Surface Finish of Grey Iron Castings. In: Lambotte G., Lee J., Allanore A., Wagstaff S. (Ed.), Materials Processing Fundamentals 2019: . Paper presented at Materials Processing Fundamentals, 10-14 March 2019 (pp. 87-95). Springer
Open this publication in new window or tab >>Effect of Casting Temperature on the Surface Finish of Grey Iron Castings
2019 (English)In: Materials Processing Fundamentals 2019 / [ed] Lambotte G., Lee J., Allanore A., Wagstaff S., Springer, 2019, p. 87-95Conference paper, Published paper (Refereed)
Abstract [en]

One of the most common surface defects in sand casting of grey cast iron is caused by metal penetration into the sand mould. Metal penetration is a surface condition in which metal or metal oxides have filled the voids between sand grains to various depth without displacing them, thus yielding a phase of sand grains surrounded by metal and frequently by mould–metal reaction products. The penetration is often so severe that casting components are beyond the point of economical rework and must be scrapped. This experimental work has focused on reducing metal penetration on casting component on a production scale. The casting component produced has strongly affected by sand sintering metal penetration. A series of simulations were performed with the casting simulation program MagmaSoft® in order to investigate the solidification characteristics as well as the porosity formation in the casting component. 

Place, publisher, year, edition, pages
Springer, 2019
Series
The Minerals, Metals & Materials Series, ISSN 2367-1181, E-ISSN 2367-1696
Keywords
Casting simulation, Grey cast iron, Metal penetration, Solidification, Surface finish
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-82767 (URN)10.1007/978-3-030-05728-2_8 (DOI)000578452300008 ()2-s2.0-85064768814 (Scopus ID)9783030057275 (ISBN)978-3-030-05728-2 (ISBN)
Conference
Materials Processing Fundamentals, 10-14 March 2019
Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2023-01-11Bibliographically approved
Dugic, I., Berndt, R., Josefsson, S. & Hedström, M. (2018). Non-metallic inclusion and their effect on fatigue strength for case-hardened carbon steel in gears. In: TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018: . Paper presented at TMS 2018147th Annual Meeting & Exhibition, March 11-15 2018, Phoenix, Arizona (pp. 123-133). Springer
Open this publication in new window or tab >>Non-metallic inclusion and their effect on fatigue strength for case-hardened carbon steel in gears
2018 (English)In: TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018, Springer, 2018, p. 123-133Conference paper, Published paper (Refereed)
Abstract [en]

Steel is a very essential structural material and its production worldwide has shown significant increase over the last years. In steels there always exist a large number of inclusions which can have a degrading effect on the fatigue properties. This study is focused on the link between the characteristics of non-metallic inclusions and how they affect fatigue strength of the standardized case-hardened carbon steel 20MnCr5 and a version of this steel with a more favorable inclusion distribution, a so-called Clean steel. For the evaluation of the mechanical properties the test result from rotary bending tests are compared and an improvement by 37.5% in fatigue strength can be noted between the different steels. The new performed ultrasonic tests illustrate the difference in the size of defects in materials with different manufacturing processes and degree of reduction. By studying international and European standards for non-destructive testing and investigation of alloy compounds, the current material specification can be adjusted. © The Minerals, Metals & Materials Society 2018.

Place, publisher, year, edition, pages
Springer, 2018
Series
The Minerals, Metals & Materials Series, ISSN 2367-1181, E-ISSN 2367-1696
Keywords
Clean-steel, Inclusions, Mechanical properties, Standard, Steel, Ultrasonic test, Bending tests, Binary alloys, Carbon steel, Chromium alloys, Fatigue of materials, Fatigue testing, Hardening, Manganese alloys, Nondestructive examination, Standards, Clean steel, Degree of reduction, European Standards, Inclusion distribution, Manufacturing process, Material specification, Non destructive testing, Non-metallic inclusions, Ultrasonic testing
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-83521 (URN)10.1007/978-3-319-72526-0_12 (DOI)2-s2.0-85044442225 (Scopus ID)9783319725253 (ISBN)
Conference
TMS 2018147th Annual Meeting & Exhibition, March 11-15 2018, Phoenix, Arizona
Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2022-05-10Bibliographically approved
Dugic, I. (2017). Effect of Molybdenum Content, Pouring Temperature and Cooling Rate on the Casting Defects of High Chromium White Cast Iron. In: TMS 2017 146TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS: . Paper presented at 146th TMS Annual Meeting and Exhibition, FEB 26-MAR 02, 2017, San Diego, CA (pp. 475-482). Springer
Open this publication in new window or tab >>Effect of Molybdenum Content, Pouring Temperature and Cooling Rate on the Casting Defects of High Chromium White Cast Iron
2017 (English)In: TMS 2017 146TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS, Springer, 2017, p. 475-482Conference paper, Published paper (Refereed)
Abstract [en]

High chromium white cast are commonly used in application requiring excellent abrasion resistance, as central parts for pumps. The specifications and requirements applied for the white cast iron components are among the most stringent used within the iron foundry branch. One of the biggest problems for the production of these components is hot tearing. Irrespective of the name, this phenomenon represents the formation of an irreversible failure (crack) in the still semisolid casting. This paper aims to investigate the effect of molybdenum content, pouring temperature and cooling rate on the casting defect hot tearing. The procedure to achieve this was to study one casting component, impeller, in a production scale. The experiments showed that molybdenum content and pouring temperature had an important influence on casting defects. It was also observed that the solidification rate has a strong effect on the hot cracking.

Place, publisher, year, edition, pages
Springer, 2017
Series
Minerals Metals & Materials Series, ISSN 2367-1181
Keywords
White cast iron, Molybdenum, Pouring temperature, Cooling rate, Hot tearing and casting
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-67009 (URN)10.1007/978-3-319-51493-2_45 (DOI)000401654100045 ()2-s2.0-85042355043 (Scopus ID)978-3-319-51493-2 (ISBN)978-3-319-51492-5 (ISBN)
Conference
146th TMS Annual Meeting and Exhibition, FEB 26-MAR 02, 2017, San Diego, CA
Available from: 2017-07-19 Created: 2017-07-19 Last updated: 2019-08-29Bibliographically approved
Dioszegi, A., Svidro, P., Elmquist, L. & Dugic, I. (2016). Defect formation mechanisms in lamellar graphite iron related to the casting geometry. International Journal of Cast Metals Research, 29(5), 279-285
Open this publication in new window or tab >>Defect formation mechanisms in lamellar graphite iron related to the casting geometry
2016 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 29, no 5, p. 279-285Article in journal (Refereed) Published
Abstract [en]

Although lamellar cast iron has been used in advanced applications for about 20 years, our knowledge about the mechanisms affecting microstructure and defect formation is relatively limited. The present paper summarises some solidification-related phenomena from a series of recently published peer-reviewed papers and scientific theses and suggests a mechanism of defect formation which is dependent on the shape of the solidifying casting geometry. When shrinkage porosity or metal expansion penetration occurs, evidence of material transport in the intergranular zone of primary equiaxed austenite grains in the casting and in the intergranular regions between the sand grains in the mould material is seen. Material transport occurs across the casting-mould interface, where the existence of or the permeability of the primary columnar zone determines if material transport can take place.

Keywords
Lamellar graphite iron, Shrinkage porosity, Metal expantion penetrayion, Defect formation mechanisms, Primary austenite grains, Equiaxed zone, Columnar zone, Columnar to equiaxed transition
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-58208 (URN)10.1080/13640461.2016.1211579 (DOI)000386206200006 ()2-s2.0-84980349450 (Scopus ID)
Available from: 2016-11-18 Created: 2016-11-18 Last updated: 2017-11-29Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0453-0503

Search in DiVA

Show all publications