Relevant bibliographies by topics / Ultra-high strength steel

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Academic literature on the topic 'Ultra-high strength steel'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 January 2023

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Journal articles on the topic "Ultra-high strength steel"

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YASUNO, TAKUYA, KAZUHIKO KURIBAYASHI, and TADASHI HASEGAWA. "Ultra-High Strength Steel." Sen'i Gakkaishi 48, no. 9 (1992): P489—P495. http://dx.doi.org/10.2115/fiber.48.9_p489.

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Hietala, Mikko, Antti Järvenpää, Markku Keskitalo, and Kari Mäntyjärvi. "Bending Strength of Laser-Welded Sandwich Steel Panels of Ultra-High Strength Steel." Key Engineering Materials 786 (October 2018): 286–92. http://dx.doi.org/10.4028/www.scientific.net/kem.786.286.

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The study was performed to investigate the bending resistance of laser-welded sandwich panels (Vf-core). The main aim of the study was to determine the effect of the tensile strength on bending strength of the panel structures. Panels were manufactured using an ultra-high strength (UHS) and low strength (LS) steels with yield strengths of 1200 and 200 MPa, respectively. Secondly, the bending strength of the panel structures was compared with the conventional sheet steels to estimate the possibilities for weight reduction. Results showed that the UHS steel panels had significantly higher bending strength than panels of the LS steel. The bending strength in the weakest loading direction of the UHS panel was approximately four times higher than the one of LS steel panel. The panels made with UHS steel faceplates and LS steel cores had better bending strength than LS steel panels. In comparison to UHS sheet steel, 30% weight saving is estimated by using the geometry optimized UHS steel panel.
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Väisänen, Anu, Kari Mäntyjärvi, and Jussi A. Karjalainen. "Bendability of Ultra-High-Strength Steel." Key Engineering Materials 410-411 (March 2009): 611–20. http://dx.doi.org/10.4028/www.scientific.net/kem.410-411.611.

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Utilisation of ultra-high-strength (UHS) steels is rapidly spreading from the automotive industry into many other application areas. It is necessary to know how these materials behave in common production processes such as air bending. The bendability of UHS steels is much lower compared to normal and high-strength construction steels. In this work, experimental tests were carried out using complex phase (CP) bainitic-martensitic UHS steels (YS/TS 960/1000 and 1100/1250) and S650MC HS steel in order to inspect material bendability and possible problems in the bending process. Mechanical and geometrical damages were registered and classified. The bending method used was air bending and press brake bending with an elastic lower die. The FE analysis was used to understand the stress state at different points in the material and build-up of failure. As UHS steels cannot stand large local strains, a large radius must be used in air bending. The results show that even when a large radius is used in air bending, the strain is not evenly distributed; there is a clear high strain area in the middle of the bend. It was also possible to simulate the other phenomena occurring in experimental tests, such as losing contact with the punch and ‘nut-like’ geometry, using FE analysis. Experimental test results also show that by using an elastic lower die, it is possible to avoid unwanted phenomena and obtain an almost 50% smaller punch radius, but the required force is 50% bigger than that required in air bending.
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Chen, Meng Yang, Bo Ming Hwuang, and Jer Ren Yang. "Microstructural Characterizations of Ultra-High Strength Steel Bars." Advanced Materials Research 168-170 (December 2010): 796–804. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.796.

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Steel bars used in high-rising building were developed by the addition of V and Nb in medium carbon steels. In this study, two steel bars with different diameters (16 mm and 36 mm) were analyzed via optical and transmission electron microscopy (OM and TEM)., the microstructures of the steels studuied consist of ferrite and pearlite the same as those of the conventional steel bars, but they possess higher yield strengths (over 685 MPa) in combination of considerable elongations (above 10%). The results of transmission electron microscopy reveals that the copious nano-sized (about 20 nm) carbides were interphase-precipitated in ferrite and that the inter-lamellar spacings of pearlite were extra fine, about with a scale of 100 nm. It has been estimated that the small carbides and fine pearlite provide yield strengths, approximately 300 MPa and 800 MPa, respectively. In addition, the volume fraction of ferrite was up to 40%, which offered sufficient soft phase to experience external stress. The results of tensile tests for the steels studied demonstrat that the amount of strain can be up to 1.4% as a yield stress is reached, and the apparent yield point and plateau are present in the stress-strain curves.
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Arola, Anna Maija, Kari Mäntyjärvi, and Jussi A. Karjalainen. "FEM - Modeling of Bendability of Ultra-High Strength Steel." Key Engineering Materials 549 (April 2013): 333–39. http://dx.doi.org/10.4028/www.scientific.net/kem.549.333.

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Ultra-high strength steels have been widely used in different industrial applications. It is necessary to understand the behavior of these materials in common forming processes such as air bending. It is known that the bendability of ultra-high strength steels is lower than other high-strength steels but what are yet to be discovered are the parameters that define the limits of bendability of these steels. The aim of this study was to investigate the factors affecting the bendability of ultra-high strength steel using optical strain measurements and FEM-modeling of the bending process. By using the true stress-strain relation measured by optical strain measuring system the bendability of ultra-high-strength steel was modeled fairly accurately. As a result, it was noted that the strain distribution at the bend of a steel possessing better uniform strain was more widely distributed and there were no highly localized strains. On the other hand as the failure occurred the strains were considerably smaller than the true failure strain of the material in uniaxial tension. As a conclusion it was stated that the ability to withstand the localization of deformation might describe the bendability of ultra-high-strength steel better than the values of the uniform or true failure strain in uniaxial tension test.
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Haiko, Oskari, Kati Valtonen, Antti Kaijalainen, Vahid Javaheri, and Jukka Kömi. "High-stress abrasive wear characteristics of ultra-high strength press-hardening steel." Tribologia - Finnish Journal of Tribology 39, no. 3−4 (December 31, 2022): 32–41. http://dx.doi.org/10.30678/fjt.122836.

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Ultra-high strength steels are widely utilized in many applications operating in harsh abrasive wear conditions. For instance, the machineries used in mining and mineral handling or in agricultural sector require robust, but cost-effective wear-resistant materials. Steels provide excellent combination of mechanical properties and usability. This study encompasses mechanical and wear testing of an experimental medium-carbon press-hardening steel. The as-received material was austenitized at two different temperatures and quenched in water. Additionally, low-temperature tempering was applied for one variant. In total, three variants of the press-hardening steel were produced. Microstructural characterization and mechanical testing were conducted for the steel samples. The wear testing was carried out with high-stress abrasive method, in which the samples were rotated inside a crushed granite bed. A commercial 400 HB grade wear-resistant steel was included in the wear testing as a reference. The experimental steel showed very high mechanical properties reaching tensile strength up to 2600 MPa with hardness of 750 HV10. Wear testing resulted in only minimal differences between the three variants indicating that the improved impact toughness by tempering did not significantly affect the wear resistance. The reference steel had nearly two times greater mass loss compared to the higher hardness press-hardening steels. Microhardness measurements on the worn surface showed drastic increase in hardness for the deformed structure for all samples. It was concluded that even the high-hardness martensitic steels exhibit notable wear surface work-hardening. Therefore, hardness was determined to be the most significant factor affecting the wear performance of studied steels.
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Zhang, Ju, Chang Wang Yan, and Jin Qing Jia. "Compressive Strength and Splitting Tensile Strength of Steel Fiber Reinforced Ultra High Strength Concrete (SFRC)." Applied Mechanics and Materials 34-35 (October 2010): 1441–44. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1441.

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This paper investigates the compressive strength and splitting tensile strength of ultra high strength concrete containing steel fiber. The steel fibers were added at the volume fractions of 0%, 0.5%, 0.75%, 1.0% and 1.5%. The compressive strength of the steel fiber reinforced ultra high strength concrete (SFRC) reached a maximum at 0.75% volume fraction, being a 15.5% improvement over the UHSC. The splitting tensile strength of the SFRC improved with increasing the volume fraction, achieving 91.9% improvements at 1.5% volume fraction. Strength models were established to predict the compressive and splitting tensile strengths of the SFRC. The models give predictions matching the measurements. Conclusions can be drawn that the marked brittleness with low tensile strength and strain capacities of ultra high strength concrete (UHSC) can be overcome by the addition of steel fibers.
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Hlebová, Stanislava, and Ladislav Pešek. "Toughness of Ultra High Strength Steel Sheets ." Materials Science Forum 782 (April 2014): 57–60. http://dx.doi.org/10.4028/www.scientific.net/msf.782.57.

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Currently only few methods exist for thin steel sheet testing, especially based on fracture mechanics concept. Charpy impact test is one of the most used method for testing notch toughness and fracture behaviors because of the simplicity and the other advantages [. This article deals with toughness testing of automotive ultra high strength steel sheets (UHSS). Several standard types of toughness test that generate data for specific loading conditions and/or component design approaches exist. Two definition of toughness will be discussed: i) Charpy V-notch toughness, method includes joining of thin steel sheets to one compact unit and ii) material (tensile) toughness [. Two steels were used, DP1000 and 1400M of 1,8 mm thickness and two joining techniques: bonding with adhesives and joining with holders. Effect of material, joining technology, structural adhesives, and number of joined plates on the toughness values was quantified at the room temperature. Toughness of steels by the tensile test was added for comparison. Fracture surface was observed using scanning electron microscope analysis.
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Kah, Paul, Markku Pirinen, Raimo Suoranta, and Jukka Martikainen. "Welding of Ultra High Strength Steels." Advanced Materials Research 849 (November 2013): 357–65. http://dx.doi.org/10.4028/www.scientific.net/amr.849.357.

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The ongoing need to reduce the weight of products while increasing strength has resulted in new generation steel manufacturing using special heat treatments to produce High Strength Steels (HSS) and Ultra High Strength Steels (UHSS) with up to 1700 MPa tensile strength. The high strength level of these steels makes it possible to produce structures with a considerable weight and cost reduction, and such steels have been adopted in the automotive industry and for mobile heavy equipment. Welding of UHSS is, however, not without its complications and welding processes for these steels need careful attention. For instance, their high susceptibility to cracking and Heat Affected Zone (HAZ) softening are risks that need to be borne in mind when choosing welding parameters. This research work discusses the difficulties and challenges of successful welding of UHSS. Common welding methods used in welding of UHSS are briefly reviewed to gain a better understanding of the effects of different welding parameters and methods. The paper finds that UHSS can be satisfactorily welded with laser welding, electron beam welding, resistance welding, and conventional arc welding methods, but the quality of the weld is dependent on appropriate control of several parameters and variables of the welding processes.
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Liu, Zhi Yong, Xin Lai He, Shan Wu Yang, and Qiang Xue Zhou. "Ultra-Low Carbon High Strength Weathering Steels." Advanced Materials Research 317-319 (August 2011): 236–39. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.236.

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The ultra-low carbon high strength weathering steel was trial manufactured. By Optical micrographs observation, scanning electronic microscope (SEM), transmission electronic microscope (TEM), accelerated corrosion test, the corrosion resistant performance of test steel and CortenB steel were studied. The results showed that yield strength, tensile strength, elongation and -40 °C impact energy of test steel reached 510MPa, 600MPa, 22% and 115J, respectively. Corrosion resistance of test steel was superior to that of CortenB. The microstructure of ferrite and bainite, quickly forming adhesive dense rust layers to improve the corrosion resistance of test steel.
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Dissertations / Theses on the topic "Ultra-high strength steel"

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Anderson, Cheryl Marie. "The weldability of high and ultra-high strength steel." Thesis, Swansea University, 2003. https://cronfa.swan.ac.uk/Record/cronfa42947.

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Weight reduction in body-in-white structures is necessary to make automobiles more fuel-efficient. A range of high and ultra-high strength strip steels have been developed, that will play a key role in achieving lower weights since the steels have the potential to achieve equivalent strength and crashworthiness at thinner gauges. However, the full potential of these advanced alloys can only be realised if they can be integrated into production facilities that rely on resistance spot welding as the predominant means of component joining. In particular, spot welds manufactured in these modern high strength steels will need to meet the strength and fracture resistance requirements that are based on automotive manufacturers' familiarity with low alloy steels. Dual phase steels are a range of modern alloys causing considerable excitement due to their combination of high strength, high ductility and improved crashworthiness in automotive components, compared to mild steel. Their commercial production routes rely on a metallurgical understanding of how chemical composition and thermomechanical treatments interrelate to produce appropriate microstructures. Their often complex alloy compositions mean that there is potential for significant changes to take place in the microstructure on resistance welding. This research programme has considered the important relationships from which resistance spot-welds, produced in high strength steels, derive their properties. This includes an investigation into the continuous cooling transformation behaviour of four dual phase alloys, in comparison to low alloy grades, and measurement of the mechanical properties associated with their microstructures. The thermal profiles generated within spot welds have been measured using a thermocouple technique. Advanced resistance spot welding processes, that can modify the metallurgical condition of a spot-weld, have been investigated with some success, both in terms of reductions in weld hardness following pulsed welding schedules, and an understanding of the effect of such schedules on the thermal cycle.
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Hartman, Trent J. "Friction Stir Spot Welding of Ultra-High Strength Steel." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3302.

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Friction stir spot welding (FSSW) is quickly becoming a method of interest for welding of high strength steel (HSS) and ultra high strength steel (UHSS). FSSW has been shown to produce high quality welds in these materials, without the drawbacks associated with fusion welding. Tool grade for polycrystalline cubic boron nitride (PCBN) tools has a significant impact on wear resistance, weld quality, and tool failure in FSSW of DP 980 steel sheet. More specifically, for a nominal composition of 90% CBN, the grain size has a significant impact on the wear resistance of the tool. A-type tools performed the best, of the three grades that were tested in this work, because the grain size of this grade was the finest, measuring from 3-6 microns. The effect of fine grain size was less adhesion of DP 980 on the tool surface over time, less abrasive wear, and better lap shear fracture loads of the welds that were produced, compared to the other grades. This is explained by less exposure of the binder phase to wear by both adhesion and abrasion during welding of DP 980. A-type tools were the most consistent in both the number of welds per tool, and the number of welds that reached acceptable lap shear fracture loads. B-type tools, with a bimodal grain size distribution (grain size of 4 – 40 microns) did a little bit better than C-type tools (grain size of 12-15 microns) in terms of wear, but neither of them were able to achieve consistent acceptable lap shear fracture load values after the first 200 welds. In fact only one out of five C-type tools was able to produce acceptable lap shear fracture loads after the first 100 welds.
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Sederstrom, Jack Hunter. "Spot friction welding of ultra high-strength automotive sheet steel / /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1724.pdf.

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Lord, Michael. "Design and modelling of ultra-high strength steel weld deposits." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/221873.

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Sederstrom, Jack H. "Spot Friction Welding of Ultra High-Strength Automotive Sheet Steel." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/842.

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Spot friction welding (SFW) was performed on ultra high strength steel (UHSS) steel sheet commonly used in automobile manufacturing. Alloys studied included DP780, DP780EG, DP980, and DF140T sheet steel of varying thickness from 1.2 mm to 1.4 mm. Welding was accomplished using a PCBN standard tool. Weld strengths were then compared to a proposed AWS standard. Initial hardness readings were taken in cross sectioned samples. Grain structure in a SFW is presented. Resistance spot welds were created in three steels. This study focuses on the strength of SFW joints as compared to traditional resistance spot welding (RSW) in welding like materials to one another. Cycle times of SFW were also evaluated and compared to production rate cycle times of RSW.
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Ma, Ning [Verfasser]. "Prediction of springback for ultra high strength steel sheets / Ning Ma." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1043521739/34.

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De, Carufel Sarah. "Effect of High-Performance Steel Materials on the Blast Behaviour of Ultra-High Performance Concrete Columns." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35380.

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Previous events have demonstrated the vulnerability of reinforced concrete infrastructure to blast loading. In buildings, ground-story columns are key structural components, and their failure can lead to extensive damages which can cause progressive collapse. To prevent such disasters, the steel reinforcement in such columns must be properly detailed to ensure sufficient strength and ductility. The use of modern concrete materials such ultra-high performance concrete (UHPC) is one potential solution to improve the blast performance of columns. UHPC shows high compressive strength, high tensile resistance and superior toughness, properties which make it ideal for use in the blast-resistant design of columns. The combined use of UHPC and high-performance steels can potentially be used to further enhance the blast resistance of columns. This thesis presents an experimental and analytical study which investigated the use of high-performance materials to increase the blast capacity and ductility of reinforced concrete columns. As part of the experimental study, a total of seventeen columns were tested under simulated blast loading using the University of Ottawa Shock-Tube. Parameters investigated included the effect of concrete type (NSC and UHPC), steel reinforcement type (normal-strength, high-strength or highly ductile), longitudinal reinforcement ratio, seismic detailing and fiber properties. The test program included two control specimens built with normal-strength concrete, five specimens built with UHPC in combination with high-strength steel, and ten columns built with highly ductile stainless steel reinforcement. Each column was subjected to a series of increasing blast pressures until failure. The performance of the columns is investigated by comparing the displacements, impulse capacity and secondary fragmentation resistance of the columns. The results show that using high-performance steels increases the blast performance of UHPC columns. The use of sufficient amounts of high-strength steel in combination with UHPC led to important increases in column blast capacity. The use of ductile stainless steel reinforcement allowed for important enhancements in column ductility, with an ability to prevent rupture of tension steel reinforcement. The study also shows that increasing the longitudinal reinforcement ratio is an effective means of increasing the blast resistance of UHPC columns The thesis also presents an extensive analytical study which aimed at predicting the response of the test columns using dynamic inelastic, single-degree-of-freedom (SDOF) analysis. A sensitivity analysis was also performed to examine the effect of various modelling parameters on the analytical predictions. Overall, it was shown that SDOF analysis could be used to predict the blast response of UHPC columns with reasonable accuracy. To further corroborate the results from the experimental study, the thesis also presents an analytical parametric study examining the blast performance of larger-scale columns. The results further demonstrate the benefits of using UHPC and high-performance steel reinforcement in columns subjected to blast loading.
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Aldén, Rickard. "Innovative Methods for Welding Ultra High Strength Steel with Resistance Spot Welding." Thesis, KTH, Industriell produktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-245224.

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Resistance spot welding (RSW) is the most frequently used method for welding thin sheets in manufacturing industries such as the automotive industry, because of the high productivity of RSW. In order to reduce CO2 emissions the automotive industry strives towards creating structures of light weight, this is partly achieved by the use of lightweight materials such as Aluminum and composite materials. In parts of the car body designed to protect the driver and passengers in case of a collision High strength steel is used due to its high strength and relative high ductility. High strength steels are called Ultra High Strength Steels (UHSS) with typical ultimate tensile strength of 700 up to 2000 MPa and elongation of 10-40%. Because of the strive against lighter structures and great safety demands UHSS materials is of great interest for the automotive industry in order to create strong structures of light weight. In welding of modern materials such as UHSS with RSW, achieving adequate weld quality is a challenge. Hence this thesis aims to investigate new innovative ways to broaden the area of use and include modern materials such as UHSS for the traditional method of welding such as RSW. In RSW elliptical shaped welds are created between two or more faying metal sheets by passing current through the sheets. The current is applied to the sheets by copper electrodes in contact with the sheets on each side. The geometrical shape of these electrodes will affect multiple welding parameters such as applied stress, current density, electromagnetic stirring, temperature gradients and the possibility for the welded material to thermally expand during welding. Hence the geometrical shape of the electrodes will affect the final shape and size of the weld nugget. In this thesis RSW electrode geometries are modified and tested. The weld properties from modified electrodes are compared to the weld properties from standard RSW electrodes with respect to process robustness, weld nugget shape and size, micro hardness and weld tensile strength. Various modified geometries are used, all modified geometries are designed in order to allow the welded material to expand more, compared to standard electrodes. Previous work has been done and shown that hollow electrodes that allow the welded material to expand can improve the weld quality and process robustness. However, this has been to the cost of nugget growth in the normal direction to the welded sheet, leaving a non-uniform surface. Hence the aim of this thesis is to investigate if it is possible to widen the current range in the weld lobe diagram when welding UHSS material combinations with RSW by the use of hollow electrodes without affecting weld quality negatively compared to standard electrodes. Weld quality in this thesis will be evaluated based on surface condition, mechanical strength, micro-hardness and weld nugget size. The modified electrodes have shown better weld properties with respect of current range in the weld lobe curves in most cases tested but not all of the material combinations tested compared with standard electrodes. The surface conditions of the welded specimens have been controlled by measuring any indent and raise by line laser scanning. Modified RSW electrodes has showed improved welding properties with respect to current range in the weld lobe curves compared to standard RSW electrodes when welding UHSS material combinations. However modified electrodes have shown a higher sensitivity to misalignment and angle fault. Several material combinations of UHSS that has shown non-weldable behavior with standard RSW electrodes have shown improved current range. In the best case the current range was increased to 3,9 kA for an UHSS material combination that is non-weldable with standard electrodes.
Motståndsvetsning är den vanligaste metoden för svetsning av tunna plåtar i tillverkningsindustrier som bilindustrin på grund av den höga produktiviteten hos punktsvetsning. För att minska koldioxidutsläppen strävar bilindustrin efter att skapa lättviktskonstruktioner, vilket delvis uppnås genom användning av lätta material såsom aluminium och kompositmaterial. I delar av bilkroppen konstruerad för att skydda föraren och passagerare vid kollision används höghållfast stål på grund av sin höga hållfasthet och relativt höga duktilitet. Höghållfasta stål kallas Ultra High Strength Steels (UHSS) med typisk draghållfasthet på 700 upp till 2000 MPa och förlängning av 10-40%. På grund av bilindustrins strävan mot lättare strukturer och höga säkerhetskrav är UHSS-material av stort intresse för bilindustrin för att skapa starka strukturer av lätt vikt. Vid svetsning av moderna material som UHSS med punktsvetsning är det en utmaning att uppnå tillräcklig svetskvalitet. Därför syftar denna avhandling till att undersöka nya innovativa sätt att bredda användningsområdet och inkludera moderna material som UHSS för den traditionella svetsmetoden punktsvetsning. Under punktsvetsning skapas elliptiskt formade svetsar mellan två eller flera metallplåtar genom att ström passerar genom plåtarna. Strömmen appliceras till plåtarna genom kopparelektroder i kontakt med plåtarna på var sida. Den geometriska formen av dessa elektroder kommer att påverka flera svetsegenskaper såsom applicerad tryck, strömtäthet, elektromagnetisk omröring, temperaturgradienter och möjligheten för det svetsade materialet att termiskt expandera under svetsning. Följaktligen kommer den geometriska formen av elektroderna att påverka den slutliga formen och storleken hos svetslinsen. I denna avhandling modifieras och testas elektrodgeometrier som används vid punktsvetsning. Svetsegenskaperna från modifierade elektroder jämförs med svetsegenskaperna från standardelektroder med avseende på processens robusthet, svetslinsform-och storlek, mikrohårdhet och svetshållfasthet. Olika modifierade geometrier används, alla modifierade geometrier är utformade för att låta det svetsade materialet expandera mer jämfört med standardelektroder. Tidigare arbete har gjorts och visat att ihåliga elektroder som tillåter det svetsade materialet att expandera kan förbättra svetskvaliteten och processens robusthet. Detta har dock varit till kostnaden av svetslinstillväxt i riktning vinkelrätt till den svetsade plåten, vilket lämnar en ojämn yta. Avsikten med denna avhandling är därför att undersöka om det är möjligt att bredda användingen av punktsvetsning till svetsning av UHSS-materialkombinationer genom användning av ihåliga elektroder utan att påverka svetskvaliteten negativt jämfört med standardelektroder. Svetskvaliteten i denna avhandling kommer att utvärderas baserat på yttillstånd, mekanisk hållfasthet, mikrohårdhet och svetslinsstorlek. De modifierade elektroderna har visat bättre svetsegenskaper med avseende på svetsbarhet i de flesta fall testade men inte alla materialkombinationer som testats jämfört med standardelektroder. Ytförhållandena för de svetsade exemplen har kontrollerats genom att mäta intryck och upphöjnad på den svetsade ytan genom laserskanning. Flera materialkombinationer av UHSS som har visat sig osvetsbara med standard elektroder har visat förbättrad svetsbarhet med modifierade elektroder. I bästa fall ökade strömintervallet med godkänd svets till 3,9 kA för en UHSS-materialkombination som inte är svetsbar med standardelektroder.
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Krossa, Alexander. "Material characteristics of new ultra high-strength steels manufactured by Giflo Steels." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/236243/1/Alexander%2BKrossa%2BThesis%281%29.pdf.

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This thesis has investigated the material characteristics of the new high-strength steel (HSS) produced by Giflo Steels (F-series steel) using detailed experimental studies involving ambient and elevated temperature mechanical property tests, post-fire mechanical property tests and V-Charpy notch tests for hardness. Its findings have shown that the new F-series steel has an advantage over similar HSS as it has superior post-fire mechanical properties, while retaining also the other mechanical properties within the requirements of relevant design standards.
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Haglund, Adam. "Reduction of hydrogen embrittlement on Electrogalvanized Ultra High Strength Steels." Thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-236603.

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Ultra-high strength steels is known to be susceptible for hydrogen embrittlement at very low concentrations of hydrogen. In this thesis three methods to prevent or reduce the hydrogen embrittlement in martensitic steel, with tensile strength of 1500 MPa, were studied. First, a barrier layer of aluminium designed to prevent hydrogen to enter the steel, which were deposited by vacuum evaporation. Second, a decarburization process of the steels surface designed to mitigate the induced stresses from cutting. Last, a hydrogen relief treatment at 150°C for 11 days and 200°C for 4 days, to reduce the hydrogen concentration in the steel. The effect of the hydrogen embrittlement was analyzed by manual measurements of the elongations after a slow strain rate testing at 5*10-6 mm/s, and the time to fracture in an in-situ constant load test with a current density of 1.92 mA/cm2 in a 0.5 M Na2SO4 solution. The barrier layer showed an increase in time to fracture, but also a decrease in elongations. The decarburized steel had a small increase in the time to fracture, but not enough to make it a feasible process. The hydrogen relief treatment showed a general decrease in hydrogen concentrations, but the elongation measurements was irregular although with a tendency for improvement. The simplicity of the hydrogen relief treatment makes it an interesting process to reduce the influence of hydrogen embrittlement. However, more investigations are necessary.
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Books on the topic "Ultra-high strength steel"

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Elsudani, Abuagila H. Ali. Development of ultra-high strength in low carbon steel wire. Manchester: UMIST, 1993.

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Hang kong chao gao qiang du gang de fa zhan: Development of aeronautical ultra-high strength steels. Beijing Shi: Guo fang gong ye chu ban she, 2012.

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Billur, Eren, ed. Hot Stamping of Ultra High-Strength Steels. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-98870-2.

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Billur, Eren. Hot Stamping of Ultra High-Strength Steels: From a Technological and Business Perspective. Springer, 2018.

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Billur, Eren. Hot Stamping of Ultra High-Strength Steels: From a Technological and Business Perspective. Springer, 2019.

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Book chapters on the topic "Ultra-high strength steel"

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Sha, Wei. "Ultra High-Strength Maraging Steel." In Steels, 141–61. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4872-2_6.

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Mori, Ken-ichiro. "Smart Hot Stamping for Ultra-high Strength Steel Parts." In 60 Excellent Inventions in Metal Forming, 403–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46312-3_62.

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Hsu, T. Y., and Xuejun Jin. "Ultra-high Strength Steel Treated by Using Quenching–Partitioning–Tempering Process." In Advanced Steels, 67–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17665-4_8.

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Klein, M., H. Spindler, A. Luger, R. Rauch, P. Stiaszny, and M. Eigelsberger. "Thermomechanically Hot Rolled High and Ultra High Strength Steel Grades - Processing, Properties and Application." In Materials Science Forum, 543–50. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-981-4.543.

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Abd al al, Sahm alden, and Ákos Meilinger. "Investigation of Resistance Spot Welded Joints Made on Ultra-high-Strength Steel Sheets." In Vehicle and Automotive Engineering 4, 981–94. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15211-5_82.

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Akihiko, Nagasaka, Naito Junya, Chinzei Shota, Hojo Tomohiko, Horiguchi Katsumi, Shimizu Yuki, Furusawa Takuro, and Kitahara Yu. "Effect of Heat-Affected Zone on Spot Weldability in Automotive Ultra High Strength Steel Sheet." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 489–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119223399.ch58.

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Zhou, Cheng, Qibin Ye, and Ling Yan. "Effect of Ultra-Fast Cooling on Microstructure and Properties of High Strength Steel for Shipbuilding." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 1179–85. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48767-0_147.

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Nagasaka, Akihiko, Junya Naito, Shota Chinzei, Tomohiko Hojo, Katsumi Horiguchi, Yuki Shimizu, Takuro Furusawa, and Yu Kitahara. "Effect of Heat-Affected Zone on Spot Weldability in Automotive Ultra High Strength Steel Sheet." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 489–94. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48767-0_58.

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Cao, Zhi Qiang, Ai Bing Zhang, Deng Luo, Zheng Hai Xia, Yong Dong Zhang, and Kai Ming Wu. "Microstructural Features of a Ultra Low Carbon High Strength Acicular Ferrite Steel Thick Plate." In Materials Science Forum, 57–60. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-462-6.57.

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Zhou, Cheng, Qibin Ye, and Ling Yan. "Effect of Ultra&Fast Cooling on Microstructure and Properties of High Strength Steel for Shipbuilding." In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 1179–85. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119223399.ch147.

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Conference papers on the topic "Ultra-high strength steel"

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Tenma, Kenji, Futoshi Kina, and Wataru Suzuki. "Springback analysis of ultra high strength steel." In NUMISHEET 2014: The 9th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes: Part A Benchmark Problems and Results and Part B General Papers. AIP, 2013. http://dx.doi.org/10.1063/1.4850080.

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Liew, Richard. "Ultra-High Strength Concrete Filled Columns for Highrise Buildings." In 4th International Conference on Steel & Composite Structures. Singapore: Research Publishing Services, 2010. http://dx.doi.org/10.3850/978-981-08-6218-3_key-7.

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"Blast Behaviour of Ultra High Strength CRC Columns." In SP-293: Reinforced Concrete Columns with High Strength Concrete and Steel Reinforcement. American Concrete Institute, 2013. http://dx.doi.org/10.14359/51686239.

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Borchelt, James E., and Bala Subbaraman. "Design of Ultra-High Strength Sheet Steel Beams." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1990. http://dx.doi.org/10.4271/900428.

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Heikkala, Jouko A., and Anu J. Väisänen. "Usability Testing of Ultra High-Strength Steels." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82770.

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New ultra high strength (UHS) steels have been developed in order to get advantages in machine design and construction. Following benefits can be obtained for example: - less material usage due to lighter constructions; - better payload and less fuel consumption in vehicle industry; - energy saving in material production. A rough distinction of structural steels can be defined to ductile steels, with tensile strength less than 300 MPa, and high strength steels, up to 700 Mpa. A steel material can be defined as UHS steel when the tensile strength exceeds 700 MPa. Steels with yield strength of 1500 Mpa have been developed so far. UHS steels can also be divided into structural steels and wear resistant steels. With the tensile strength also the hardness increases and the tensile strain decreases. That causes several difficulties when the material is processed into products. Especially mechanical processing like bending, machining and shearing gets difficult as the material strength increases. That causes problems for the construction material users to find the proper manufacturing methods in production. In Oulu University Production Technology Laboratory material processing tests have been performed during several years in co-operation with the local steel manufacturer. The usability tests comprise mainly of bending and machining tests. Shearing and welding tests have been made to a smaller extent. Also laser treatment has been used for local heat conditioning in order to improve the bending and shearing properties, but these techniques are not yet widely used in production. The bending tests are carried out with standard bending tools and test steel plates with standard dimensions. The plate thickness varies depending on the test material. The target is to determine the reliable minimum bending radiuses whereby the plate can be bent without failure, from both sides and along the rolling direction and orthogonally to that. Also the springback angle is measured and the bent surfaces are evaluated according to several criteria. When necessary, also the mechanical testing of the formed material is carried out. The machining tests are made mainly by drilling. Also some milling tests have been performed. Drilling is a convenient way of machining testing because a substantial amount of holes can be drilled in one test plate. The drilling power can be observed precisely by monitoring the spindle power. Also a variety of different tool types can be used, from uncoated HSS drills to boring tools with indexable inserts. The optimal machining parameters (feed and speed) will be defined according to maximum tool life and minimum machining costs.
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Siltanen, Jukka, and Sakari Tihinen. "Position welding of 960 MPa ultra-high-strength steel." In ICALEO® 2012: 31st International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2012. http://dx.doi.org/10.2351/1.5062489.

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Futatsuka, Takayuki, Takeshi fujita, Yuji Yamasaki, and Toru inazumi. "Bend-Forming Technology for Ultra High Strength Steel Sheets." In SAE 2012 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2012. http://dx.doi.org/10.4271/2012-01-0532.

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Fujita, Nobuhiro, Toshiki Nonaka, Toshimasa Tomokiyo, Hirokazu Taniguchi, Koichi Goto, and Kazumasa Yamazaki. "Development of Ultra-High Strength Steel Sheets with Tensile Strength of 980MPa." In SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-0341.

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Jeong, Young Cheol, Cheol Hee Kim, Young Tae Cho, and Yoon Gyo Jung. "Strength analysis of laser welded lap joint for ultra high strength steel." In NUMISHEET 2014: The 9th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes: Part A Benchmark Problems and Results and Part B General Papers. AIP, 2013. http://dx.doi.org/10.1063/1.4850138.

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Liang, W. K., W. J. Tao, W. Xiao, B. Zhu, and Y. S. Zhang. "Development and Application of Conduction Heating on Ultra-High Strength Steel." In The 2nd International Conference on Advanced High Strength Steel and Press Hardening (ICHSU 2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813140622_0083.

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Reports on the topic "Ultra-high strength steel"

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Weiss, Charles, William McGinley, Bradford Songer, Madeline Kuchinski, and Frank Kuchinski. Performance of active porcelain enamel coated fibers for fiber-reinforced concrete : the performance of active porcelain enamel coatings for fiber-reinforced concrete and fiber tests at the University of Louisville. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40683.

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A patented active porcelain enamel coating improves both the bond between the concrete and steel reinforcement as well as its corrosion resistance. A Small Business Innovation Research (SBIR) program to develop a commercial method for production of porcelain-coated fibers was developed in 2015. Market potential of this technology with its steel/concrete bond improvements and corrosion protection suggests that it can compete with other fiber reinforcing systems, with improvements in performance, durability, and cost, especially as compared to smooth fibers incorporated into concrete slabs and beams. Preliminary testing in a Phase 1 SBIR investigation indicated that active ceramic coatings on small diameter wire significantly improved the bond between the wires and the concrete to the point that the wires achieved yield before pullout without affecting the strength of the wire. As part of an SBIR Phase 2 effort, the University of Louisville under contract for Ceramics, Composites and Coatings Inc., proposed an investigation to evaluate active enamel-coated steel fibers in typical concrete applications and in masonry grouts in both tension and compression. Evaluation of the effect of the incorporation of coated fibers into Ultra-High Performance Concrete (UHPC) was examined using flexural and compressive strength testing as well as through nanoindentation.
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Garrison, Jr, and W. M. An Investigation of the Role of Second Phase Particles in the Design of Ultra High Strength Steels of Improved Toughness. Fort Belvoir, VA: Defense Technical Information Center, June 1990. http://dx.doi.org/10.21236/ada226056.

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Anthony J. DeArdo and C. Isaac Garcia. Conservation Research and Development/ New Ultra-Low Carbon High Strength Steels with Improved Bake Hardenability for Enhanced Stretch Formability and Dent Resistance. Office of Scientific and Technical Information (OSTI), December 2003. http://dx.doi.org/10.2172/820518.

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FIRE RESISTANCE OF STEEL TUBULAR COLUMNS INFILLED WITH ULTRA-HIGH STRENGTH CONCRETE. The Hong Kong Institute of Steel Construction, September 2018. http://dx.doi.org/10.18057/ijasc.2018.14.3.8.

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FINITE ELEMENT ANALYSIS OF LOCAL BUCKLING OF STEEL AND COMPOSITE COLUMNS UTILISING HIGH AND ULTRA-HIGH STRENGTH STEEL. The Hong Kong Institute of Steel Construction, December 2018. http://dx.doi.org/10.18057/icass2018.p.017.

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FINITE ELEMENT SIMULATION FOR ULTRA-HIGH-PERFORMANCE CONCRETE-FILLED DOUBLE-SKIN TUBES EXPOSED TO FIRE. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.263.

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Ultra-high-performance concrete (UHPC) or ultra-high-strength concrete (UHSC) are alternatively used to reduce construction materials, thereby achieving more sustainable constructions. Moreover, engaging the advantages of concrete cores and outer steel tubes in concrete-filled steel tubes (CFST) or ductile concrete-filled double-skin tubes (CFDST) is of great interest for the better performance of such members under fire. Nevertheless, current design provisions do not provide design models for UHPC-filled double-skin tubes under fire, and existing finite-element (FE) methodologies available in the literature may not accurately simulate the behaviour of CFDST exposed to fire. Therefore, this paper develops a comprehensive FE protocol implementing the scripting technique to model CFDST members for heat transfer and coupled (simultaneously or sequentially) thermal-stress analyses. Various modelling parameters incorporated in the proposed FE routine include the cross-sectional geometry (circular, elliptical, hexagonal, octagonal, and rectangular), the size (width, diameter, and wall thickness), interactions, meshing, thermal- and mechanical-material properties, and boundary conditions. The detailed algorithm for heat transfer analysis is presented and elaborated via a flow chart. Validations, verifications, and robustness of the developed FE models are established based on extensive comparison studies with existing fire tests available in the literature. As a result, and to recognize the value of the current FE methodology, an extensive parametric study is conducted for different affecting parameters (e.g., nominal steel ratio, hollowness ratio, concrete cylindrical strength, yield strength of metal tubes, and width-to-thickness ratio). Extensive FE results are used for optimizing the fire design of such members. Consequently, a simplified and accurate analytical model that can provide the axial load capacity of CFDST columns under different fire ratings is presented
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NUMERICAL STUDY ON SHEAR BEHAVIOUR OF ENHANCED C-CHANNELS IN STEEL-UHPC-STEEL SANDWICH STRUCTURES. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.4.

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This paper firstly developed a three-dimensional (3D) finite element model (FEM) for enhanced C-channels (ECs) in steel-UHPC-steel sandwich structures (SUSSSs). The FEM was validated by 12 push-out tests on ECs with UHPC. With the validated FEM, this paper performed in-depth parametric studies on shear behaviours of ECs with ultra-high performance concrete (UHPC). These investigated parameters included bolt-hole gap (a), grade (M) and diameter (d) of bolt, core strength (fc), length of C-channel (Lc), and prestressing force ratio on bolt (ρ) in ECs. Under shear forces, the ECs in UHPC exhibited successive fractures of bolts and C-channels. Increasing the bolt-hole gap within 0-2 mm has no harm on the ultimate shear resistance, but greatly improves the slip capacity of ECs. Increasing grade and diameter of bolts improves the shear resistance and ductility of ECs through increasing the PB/PC (shear strength of bolt to that of C-channel) ratio. Increasing the core strength increased the shear resistance, but reduced the ductility of ECs due to the reduced PB/PC ratio. The ECs with Lc value of 50 mm offer the best ductility. Prestressing force acting on the bolts reduced the shear strength and ductility of ECs with UHPC. Analytical models were proposed to estimate the ultimate shear resistance and shear-slip behaviours of ECs with UHPC. The extensive validations of these models against 12 tests and 31 FEM analysis cases proved their reasonable evaluations on shear behaviours of ECs with UHPC.
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