Blar i Fakultet for ingeniørvitenskap (IV) på forfatter "Ma, Jun"
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A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions
Song, Ming; Kim, Ekaterina; Amdahl, Jørgen; Ma, Jun; Huang, Yi (Journal article, 2016)The constant added mass (CAM) method and the fluid-structure interaction (FSI) method are widely used to simulate ship-ship and ship-ice collisions. In the CAM method, the hydrodynamic effect of the surrounding water is ... -
Analysis of ESAFORM 2021 cup drawing benchmark of an Al alloy, critical factors for accuracy and efficiency of FE simulations
Habraken, A.M.; Aksen, T.A.; Alves, J.L.; Amaral, R.L.; Betaieb, E.; Chandola, N.; Corallo, L.; Cruz, D.J.; Engel, B.; Esener, E.; Firat, M.; Frohn-Sörensen, P.; Galán-López, J.; Ghiabakloo, H.; Kestens, L.; Lian, J.; Lingam, R.; Liu, W.; Ma, Jun; Menezes, L.F.; Nguyen-Minh, T.; Miranda, S.S.; Neto, D.M.; Pereira, A.; Prates, P.A.; Reuter, J.; Revil-Baudard, B.; Rojas-Ulloa, C.; Sener, B.; Shen, F.; Bael, A.V.; Verleysen, P.; Barlat, F.; Cazacu, O.; Kuwabara, T.; Lopes, A.; Oliveira, M.C.; Santos, A.D.; Vincze, G. (Peer reviewed; Journal article, 2022)This article details the ESAFORM Benchmark 2021. The deep drawing cup of a 1 mm thick, AA 6016-T4 sheet with a strong cube texture was simulated by 11 teams relying on phenomenological or crystal plasticity approaches, ... -
Analytical springback assessment in flexible stretch bending of complex shapes
Ma, Jun; Welo, Torgeir (Peer reviewed; Journal article, 2020)Stretch bending is commonly used in the fabrication of profile-based shapes. However, one of the challenges in many bending-type forming processes is controlling springback upon unloading. Springback appears sensitive to ... -
Calibration of Extruded Aluminum Profiles
Killingberg, Ingebrigt (Master thesis, 2023)Denne artikkelen fokuserer på kalibrering av ekstruderte åpne aluminiumsprofiler for å forbedre dimensjonsnøyaktighet. Gapåpningstoleranser i ekstruderte profiler har vist seg å være utfordrende å kontrollere, og overgår ... -
Charge weld evolution in hollow aluminum extrusion: Experiments and modeling
Sariyarlioglu, Eren Can; Negozio, Marco; Welo, Torgeir; Ma, Jun (Peer reviewed; Journal article, 2024)Charge welds occur in billet-to-billet extrusion processes due to the transition between successive billets. The material in this transition zone is typically characterized by substandard mechanical properties. In industrial ... -
Deformation characteristics in a stretch-based dimensional correction method for open, thin-walled extrusions
Zhou, Xianyan; Welo, Torgeir; Ma, Jun; Tronvoll, Sigmund A. (Journal article; Peer reviewed, 2021)Dimensional accuracy of incoming components is crucial for automated welding and assembly in mass volume production. However, thin-walled extrusions made to industrial standards show severe dimensional variations, including ... -
Effect of Die Design on Charge Welds in Aluminium Extrusion
Sariyarlioglu, Eren Can; Negozio, Marco; Ma, Jun; Welo, Torgeir (Chapter, 2023)Aluminium extrusions are used in more and more applications in different industrial fields, due to their properties and productivity. However, in-process scrap produced in aluminium extrusions needs to be reduced to increase ... -
The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625
Lu, Xu; Díaz, Andrés; Ma, Jun; Wang, Dong; He, Jianying; Zhang, Zhiliang; Johnsen, Roy (Peer reviewed; Journal article, 2022)Recently, several hydrogen-assisted failures have been reported on different nickel alloys used in the subsea oil and gas industries. It is thus essential to correlate hydrogen uptake and diffusion behavior with stress ... -
Effect of Stretching on Springback in Rotary Stretch Bending of Aluminium Alloy Profiles
Ma, Jun; Welo, Torgeir; Blindheim, Jørgen; Ha, Taekwang (Journal article, 2021)Stretch bending is widely used for manufacturing profile-type parts. However, one of the challenges faced by the bending-type forming processes is springback, which significantly reduces the dimensional accuracy of formed ... -
ESAFORM 2021 cup drawing benchmark of an Al alloy: Critical follow up analysis of its potentials
Oliveira, C.M.; Cazacu, O.; Revil Baudard, B.; Neto, D.M.; Frohn-Sörensen, P.; Ma, Jun; Liu, W.; Cruz, D.J.; Santos, A.D.; Van Bael, Albert; Ghiabakloo, H.; Habraken, A.M. (Journal article; Peer reviewed, 2023) -
Exploring the Influence of Pre/Post-Aging on Springback in Al-Mg-Si Alloy Tube Bending
Ma, Jun; Ha, Taekwang; Blindheim, Jørgen; Welo, Torgeir; Ringen, Geir; Li, Heng (Peer reviewed; Journal article, 2020)Aluminium alloy (Al-alloy) bent tube is one kind of strategic lightweighting components, which attracts application in industrial clusters, such as automobile, aerospace, etc. To meet the demands on high-precision ... -
Flexible 3D Stretch Bending of Aluminium Alloy Profiles: An Experimental and Numerical Study
Welo, Torgeir; Ma, Jun; Blindheim, Jørgen; Ha, Taekwang; Ringen, Geir (Peer reviewed; Journal article, 2020)Three-dimensionally (3D) shaped extrusions are attracting increased attention in order to meet the ever-growing demands on weight reduction to obtain lower emissions in the automobile industry. With the current transformation ... -
Hydrogen embrittlement of additively manufactured AlCoCrFeNi2.1 eutectic high-entropy alloy
Wan, Di; Guan, Shuai; Wang, Dong; Lu, Xu; Ma, Jun (Peer reviewed; Journal article, 2022)AlCoCrFeNi2.1 eutectic high-entropy alloy (HEA) was fabricated in as-cast and additively manufactured (AM) states. The hydrogen embrittlement susceptibility of both materials was investigated through in-situ uniaxial tensile ... -
The impact of thermo-mechanical processing routes on product quality in integrated aluminium tube bending process
Ma, Jun; Welo, Torgeir; Wan, Di (Peer reviewed; Journal article, 2021)This study was conducted to provide a better understanding of the role of electric field strength in the production of aftereffects in resting state scalp electroencephalography by repetitive transcranial magnetic stimulation ... -
In-line Springback Measurement for Tube Bending Using a Laser System
Ha, Taekwang; Ma, Jun; Blindheim, Jørgen; Welo, Torgeir; Ringen, Geir; Wang, Jyhwen (Peer reviewed; Journal article, 2020)Tube bending process is extensively used for many industrial fields such as the automotive, shipbuilding, and aircraft manufacturing industries. However, one limitation of the tube bending process is that it is not easy ... -
In-Process Monitoring of Springback in Industrial Bending Using a Laser Sensor-Based Method
He, Xu; Ma, Jun; Tronvoll, Sigmund Arntsønn; Welo, Torgeir (Peer reviewed; Journal article, 2022)Bent tubes and profiles are widely used in many industries such as automotive, aerospace and shipbuilding. In bending of tubes and profiles, springback is normally regarded as a challenge, affecting the dimensional accuracy ... -
Influence of deformation prior to ageing on fatigue behavior of extruded AA6082-T6 profiles
Wang, Xintong; Ma, Jun; Welo, Torgeir (Peer reviewed; Journal article, 2022)This paper investigates the effect of plastic deformation before artificial ageing on fatigue behavior of extruded AA6082-T6 profiles. As-received, T4-temper materials are pre-deformed at different strains and followed by ... -
Low-cost tooling concept for customized tube bending by the use of additive manufacturing
Tronvoll, Sigmund Arntsønn; Treffen, Helena; Ma, Jun; Welo, Torgeir (Peer reviewed; Journal article, 2023)Bending is commonly used in the manufacturing of finished and semi-finished, profilebased products. However, costly profile and bend geometry dependent tooling hampers its applicability for low volume production or ... -
Low-cost tooling concepts for customized tube bending processes using hybrid design and additive manufacturing
Treffen, Helena (Master thesis, 2023)Denne oppgavens fokus vil være på den fleksible bøyeprosessen som tar plass i en rørbøyingsmaskin. Denne forminsprosessen tar inn en aluminiumsrør og bøyer det til den ønskede formen, med de rette dimensjonene. Det endelige ... -
Machine Learning (ML)-Based Prediction and Compensation of Springback for Tube Bending
Ma, Jun; Li, H; Chen, GY; Welo, Torgeir; Li, GJ (Chapter, 2021)Bent tubes are extensively used in the manufacturing industry to meet demands for lightweight and high performance. As one of the most significant behaviors affecting the dimensional accuracy in tube bending, springback ...