Blar i NTNU Open på forfatter "Zhang, Kai"
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Additive Manufacturing of 7xxx Aluminium Alloys by Laser Powder Bed Fusion
Zhang, Kai; Wenner, Sigurd; Marioara, Calin Daniel; Hovig, Even Wilberg; Du, Qiang; Onsøien, Morten Ingar; Marthinsen, Knut (Peer reviewed; Journal article, 2024) -
An explicit integration scheme for hypo-elastic viscoplastic crystal plasticity
Zhang, Kai; Holmedal, Bjørn; Dumoulin, Stephane; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)An explicit integration scheme for rate-dependent crystal plasticity (CP) has been developed in this work. Additive decomposition of the velocity gradient tensor into lattice and plastic parts is adopted for describing the ... -
Assessment of advanced Taylor models, the Taylor factor and yield-surface exponent for FCC metals
Zhang, Kai; Holmedal, Bjørn; Manik, Tomas; Saai, Afaf (Journal article; Peer reviewed, 2019)High-resolution crystal plasticity-finite element method (CPFEM) simulations are performed to provide new reference values of the Taylor factor M and the isotropic yield surface exponent for high stacking fault energy ... -
Characterization and Modelling of the Microstructure and Texture Evolution In AlMgSi-Extrusions
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Friis, Jesper; Pettersen, Tanja; Segatori, Antonio (Journal article, 2017)The properties and surface appearance of aluminium extrusion are critically dependent on the microstructure and texture of the extruded profiles, and the requirements with respect to these aspects may vary with applications. ... -
Controlling grain structure and texture in Al-Mn from the competition between precipitation and recrystallization
Huang, Ke; Zhang, Kai; Marthinsen, Knut; Loge, RE (Journal article; Peer reviewed, 2017)The recrystallization behaviour of Al-Mn alloys (AA3xxx series alloys) is affected by randomly distributed dispersoids present before annealing, by dispersoids precipitated at grain/subgrain boundaries before the onset of ... -
Deformation Texture Evolution in Flat Profile AlMgSi Extrusions: Experiments, FEM, and Crystal Plasticity Modeling
Manik, Tomas; Marthinsen, Knut; Zhang, Kai; Imani Aria, Arash; Holmedal, Bjørn (Peer reviewed; Journal article, 2021)In the present work, the deformation textures during flat profile extrusion from round billets of an AA6063 and an AA6082 aluminium alloy have been numerically modeled by coupling FEM flow simulations and crystal plasticity ... -
Development of aluminium alloys with superior properties for additive manufacturing
Hanssen, Herman (Master thesis, 2022)Selektiv laser smelting og andre pulverbaserte 3D-printing-metoder kan produsere komponenter med høy geometrisk kompleksitet og med suverene fysiske egenskaper. Den høye avkjølingshastigheten fører til en finkornet struktur ... -
Evolution in texture and its through-thickness variations in Al-Mg-Si-extrusions: experiments and modelling
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Aukrust, Trond; Segatori, Antonio (Chapter, 2018)The visual appearance and mechanical properties of aluminium alloy extrusions are strongly dependent on the microstructure and texture of the extruded profiles, where the desired microstructure and texture may depend on ... -
Formation of incoherent deformation twin boundaries in a coarse-grained Al-7Mg alloy
Jin, Shenbao; Zhang, Kai; Bjørge, Ruben; Tao, NR; Marthinsen, Knut; Lu, K; Li, Yanjun (Journal article; Peer reviewed, 2015)Deformation twinning has rarely been observed in coarse grained Al and its alloys except under some extreme conditions such as ultrahigh deformation strain or strain rates. Here, we report that a significant amount of Σ3 ... -
Modeling strain-path changes in aluminum and steel
Qin, Jisheng; Holmedal, Bjørn; Zhang, Kai; Hopperstad, Odd Sture (Journal article, 2017)The present paper evaluates two phenomenological plasticity models which account for the influence of strain-path change (SPC) on the stress-strain behavior. The HAH model (Barlat et al., 2014) is modified to capture SPC ... -
Multi-level modelling of mechanical anisotropy of commercial pure aluminium plate: Crystal plasticity models, advanced yield functions and parameter identification
Zhang, Kai; Holmedal, Bjørn; Hopperstad, Odd Sture; Dumoulin, Stephane; Gawad, Jerzy; Van Bael, Albert; Van Houtte, P (Journal article; Peer reviewed, 2015)The mechanical anisotropy of an AA1050 aluminium plate is studied by the use of five crystal plasticity models and two advanced yield functions. In-plane uniaxial tension properties of the plate were predicted by the ... -
Multi-level Modelling of Plastic Anisotropy of Aluminium Alloys Using Crystal Plasticity Models and Advanced Yield Functions
Zhang, Kai (Doktoravhandlinger ved NTNU, 1503-8181; 2014:164, Doctoral thesis, 2014)The hood, doors and other panels of a car can be made by aluminium sheets, through complex forming operations. Design of forming processes requires trustable models and simulations. Forming properties are different in ... -
A nomogram to predict survival probability of gastric cancer patients undergoing radical surgery and adjuvant chemotherapy
Ma, Ling; Chen, Guosheng; Wang, Deqiang; Zhang, Kai; Zhao, Fengjiao; Tang, Jie; Zhao, Jianyi; Røe, Oluf Dimitri; He, Shaohua; Liao, Dongcheng; Gu, Yanhong; Tao, Min; Shu, Yongqian; Li, Wei; Chen, Xiaofeng (Peer reviewed; Journal article, 2022)Gastric cancer (GC) is the third-leading cause of cancer mortality worldwide. The aim of this study was to develop a nomogram that estimates 1-year, 3-year, and 5-year survival probability of GC patients after D2 gastrectomy ... -
Potential technical solutions to recover tight oil: Literature and simulation study of tight oil development
Zhang, Kai (Master thesis, 2014)Over past decades, technology innovation drove unconventional resourcesbecome conventional. Incorporating the technologies applied in shale gasdevelopment, exploiting tight oil comes into stage recently. Advanced ... -
Recrystallisation Behaviour in Extruded Profiles of Non-Dispersoid Containing Al-Mg-Si Alloys
Paulsen, Christian Oen (Master thesis, 2015)Hot extrusion of non-dispersoid containing aluminium alloys commonly ends with a fully or partially recrystallised grain structure. However, the recrystallisation mechanisms, whether static or dynamic (taking place during ... -
Texture and Microstructure Evolution during Extrusion of AlMgSi-Alloys
Fylkesnes, Helge (Master thesis, 2016)The main objective of this thesis is to contribute to a better understanding of the microstructure and texture evolution during extrusion of AlMgSi alloys. The textures and microstructures in AA6082 were analysed after ... -
Through thickness variations of deformation texture in round profile extrusions of 6063-type aluminium alloy: experiments, FEM and crystal plasticity modelling
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Aukrust, Trond; Segatori, Antonio (Journal article; Peer reviewed, 2018)The deformation texture and its through-thickness heterogeneity for an extruded round profile are experimentally measured by the electron back-scatter diffraction technique (EBSD), and numerically modelled by coupling FEM ... -
Through thickness variations of deformation texture in round profile extrusions of 6063-type aluminium alloy: Experiments, FEM and crystal plasticity modelling
Zhang, Kai; Marthinsen, Knut; Holmedal, Bjørn; Aukrust, Trond; Segatori, Antonio (Journal article; Peer reviewed, 2018)The deformation texture and its through-thickness heterogeneity for an extruded round profile are experimentally measured by the electron back-scatter diffraction technique (EBSD), and numerically modelled by coupling FEM ...