Selaus tekijän mukaan kokoelmassa "Björk, Timo"Tieteelliset julkaisut
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Bond characteristics between high/ultra-high strength steel and ultra-high modulus CFRP laminates
(Elsevier, 24.12.2019)With the increasing applications of high and ultra-high strength steel (HSS/UHSS) in engineering structures, there is a need to address rehabilitation and strengthening of such steel grades using carbon fibre reinforced ... -
CFRP strengthening of butt-welded ultra-high strength steels under quasi-static tensile loading
(Elsevier, 25.08.2021)Due to the softening at the heat-affected zone (HAZ) in ultra-high strength steels (UHSS), the mechanical properties can deteriorate depending on the steels’ grade, welding heat input, and its associated cooling rate. ... -
Distortional buckling of X‐joints made of square hollow cross‐section beams: theoretical energy‐based model
(Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin, 21.01.2019)Current design codes do not consider distortional buckling failure modes, which can occur in the chord member of a tubular X‐joint loaded axially by brace members. In this study the critical load for distortional buckling ... -
Effect of loading type on the fatigue strength of asymmetric and symmetric transverse non-load carrying attachments
(Wiley, 2016)This study considers the effect of bending loading and the symmetry of joints on the fatigue strength of transverse non-load carrying attachments. Conventionally, the fatigue strength of a welded joint has been determined ... -
Effects of heat input on the mechanical properties of butt-welded high and ultra-high strength steels
(Elsevier, 09.08.2019)In this study, the mechanical properties of butt-welded thin plates made of S700, S960 and S1100 steels under various heat inputs (HI) are investigated. The gas metal arc welding (GMAW) process with two different levels ... -
Fatigue Performance of GMA-Brazed Non-Load Carrying Joints Made of Ultra-High Strength Steel
(Springer International Publishing AG, 2018)With the aim of maximizing energy efficiency, the use of low-alloyed ultra-high strength steels (UHSS) has greatly increased in vehicles and other transport applications in recent decades. Using UHSS, equivalent ultimate ... -
Fatigue strength assessment of duplex and super-duplex stainless steels by 4R method
(Springer Berlin Heidelberg, 04.10.2018)Duplex and super-duplex stainless steels are increasingly used in applications where good fatigue strength is demanded in addition to corrosion resistance. In this research work, the fatigue strength of duplex and super-duplex ... -
Fatigue strength assessment of ground fillet-welded joints using 4R method
(Elsevier, 29.08.2020)In the present paper, a fatigue analysis for welded joints made of mild, and high- and ultra-high-strength steel grades and post-weld-treated with grinding and combined grinding and peening methods is carried out using ... -
Fatigue strength assessment of TIG-dressed ultra-high-strength steel fillet weld joints using the 4R method
(Elsevier, 10.06.2020)Post-weld treatments can enhance the fatigue strength of weldments by means of improving their geometry or residual stresses, or both. In this study, the fatigue strength of TIG-dressed non-load-carrying cruciform joints ... -
Fatigue strength assessment of ultra-high-strength steel fillet weld joints using 4R method
(Elsevier, 30.11.2019)A fatigue analysis on experimentally tested transverse fillet-welded non-load-carrying T- and X-joints made of S960 and S1100 ultra-high-strength steel was carried out in the present study. The test data consisted of welded ... -
Fatigue strength capacity of load-carrying fillet welds on ultra-high-strength steel plates subjected to out-of-plane bending
(Elsevier, 12.06.2019)Weld root fatigue strength capacity is an important design criterion in load-carrying (LC) fillet welded joints subjected to cyclic loads. This paper elaborates on the weld root fatigue strength capacity of fillet welded ... -
Fatigue strength characterization of high and ultra-high-strength steel cut edges
(Elsevier, 04.12.2020)This paper investigates the fatigue strength characteristics of CO2 laser, fiber laser and plasma cut edges of S690 and S1100 steel grades. The effect on fatigue performance of surface quality, which was examined by contact ... -
Fatigue strength of longitudinal load-carrying welds in beams made of ultra-high-strength steel
(Elsevier, 06.02.2021)The present study experimentally investigates the fatigue strength of longitudinally loaded welded joints in beam structures made of ultra-high-strength steel. Hereby, the effects of different manufacturing methods and ... -
Fatigue strength of misaligned non-load-carrying cruciform joints made of ultra-high-strength steel
(Elsevier, 13.09.2020)Misalignments and distortions in welded plate components act as stress raisers and can significantly decrease the fatigue strength of welded connections. This paper investigates the effect of the plate misalignment of ... -
Finite element simulation of welding distortions in ultra-high strength steel S960 MC including comprehensive thermal and solid-state phase transformation models
(Elsevier, 17.06.2020)The objective of this study is developing a thermo-metallurgical-mechanical finite element (FE) model incorporating the effect of solid-state phase transformation (SSPT) to accurately simulate deformations for single ... -
Mechanical properties and microstructural evaluation of the heat-affected zone in ultra-high strength steels
(Elsevier, 17.09.2020)This paper presents an investigation into the mechanical properties of ultra-high strength steels (UHSSs) (with nominal yield stress of 960 and 1100 MPa) after welding. Seven weld thermal cycles were simulated using a ... -
Mechanical properties of butt-welded ultra-high strength steels at elevated temperatures
(Elsevier, 09.09.2022)Variety of ultra-high strength steels (UHSS) with different microstructural characteristics is becoming available with continuous development of the manufacturing process in the steel industries. In order to effectively ... -
Numerical and experimental investigations on the welding residual stresses and distortions of the short fillet welds in high strength steel plates
(Elsevier, 19.04.2022)The current study investigates the influence of different welding sequences and external constraints on development of welding- induced angular distortion and residual stresses in the short fillet welds made of the high ... -
On the design of fillet welds made of ultra-high-strength steel
(Springer Berlin Heidelberg, 12.07.2018)Current static design approaches for fillet arc welds made of high- or ultra-high-strength steel (UHSS) do not differ from the design of welds made of conventional steels. However, important issues such as potential softening ... -
Re-evaluation of weld root fatigue strength for load-carrying fillet welded joints using the notch stress concept
(Elsevier, 09.12.2020)The re-evaluation of fatigue strength, applying nominal and notch stress concepts has been carried out, using extracted experimental fatigue data for load-carrying fillet welded joints failing from weld root. Various ...
