Blar i Institutt for konstruksjonsteknikk på forfatter "Zhao, Kai"
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Covalent coupling regulated thermal conductivity of Poly(vinyl alcohol)/boron nitride composite film based on silane molecular structure
Cheng, Hua; Zhao, Kai; Gong, Yi; Wang, Xiao; Wang, Rui; wang, fengyu; hu, rui; wang, Fangkuo; Zhang, Xian; He, Jianying; Tian, Xingyou (Peer reviewed; Journal article, 2020)Creating covalent bonds between inorganic fillers and polymer matrix is an effective method to enhance the thermal conductivity (TC) of composite materials, while the detailed mechanism is still not clear. By introducing ... -
Dislocation based plasticity in the case of nanoindentation
Zhao, Kai; Mayer, A. E.; He, Jianying; Zhang, Zhiliang (Journal article, 2018)Understanding plasticity initiation and evolution in nanoindentation tests is a fundamental issue. In this study, a continuum model is developed to analytically predict the force-depth curve by coupling the classical ... -
The dual role of hydrogen in grain boundary mobility
Ding, Yu; Zhao, Kai; Lin, Meichao; Yu, Haiyang; Xiao, Senbo; He, Jianying; Zhang, Zhiliang (Peer reviewed; Journal article, 2023)ABSTRACT The effect of solute hydrogen on shear-coupled grain boundary (GB) migration is investigated with the dislocation-array type Σ25(430)[001] GB and a dual role of hydrogen on GB mobility is unraveled. In the low ... -
Ductile mechanisms of metals containing pre-existing nanovoids
Zhao, Kai; Ringdalen, Inga Gudem; Wu, Jianyang; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2016)The void growth in monocrystalline Cu and Fe are investigated by molecular dynamics simulations to reveal the ductile mechanisms based on dislocation emission and propagation. The results show that the void growth in Cu ... -
Effect of amorphization-mediated plasticity on the hydrogen-void interaction in ideal lattices under hydrostatic tension
Zhao, Kai; He, Jianying; Ringdalen, Inga Gudem; Zhang, Zhiliang (Journal article; Peer reviewed, 2018)A thermodynamic model is derived to study the void nucleation in ideal lattices under hydrostatic tension loading and predicts that the plasticity has to be initiated before homogeneous nucleation of voids. Molecular ... -
Effect of grain boundary on the crack-tip plasticity under hydrogen environment: an atomistic study
Zhao, Kai; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2019)It has been found that the plasticity is significantly affected by the hydrogen interstitials in metallic materials. However, the underlying physics responsible for the dislocation/hydrogen interactions is still poorly ... -
Effect of Hydrogen on the Collective Behavior of Dislocations in the Case of Nanoindentation
Zhao, Kai; He, Jianying; Mayer, A. E.; Zhang, Zhiliang (Journal article, 2018)Most of the studies reported treats the effect of hydrogen on single dislocation line, while models that describe the collective interaction are missing. In this study, hydrogen-induced softening of metallic materials is ... -
Hydrogen-enhanced grain boundary vacancy stockpiling causes transgranular to intergranular fracture transition
Ding, Yu; Yu, Haiyang; Lin, Meichao; Zhao, Kai; Xiao, Senbo; Vinogradov, Alexei; Qiao, Lijie; Ortiz, Michael; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2022)The attention to hydrogen embrittlement (HE) has been intensified recently in the light of hydrogen as a carbon-free energy carrier. Despite worldwide research, the multifaceted HE mechanism remains a matter of debate. ... -
Hydrogen-induced transgranular to intergranular fracture transition in bi-crystalline Nickel
Ding, Yu; Yu, Haiyang; Zhao, Kai; Lin, Meichao; Xiao, Senbo; Ortiz, Michael; He, Jianying; Zhang, Zhiliang (Peer reviewed; Journal article, 2021)It is known that hydrogen can influence the dislocation plasticity and fracture mode transition of metallic materials, however, the nanoscale interaction mechanism between hydrogen and grain boundary largely remains illusive. ... -
Small-Scale Plasticity under Hydrogen Environment
Zhao, Kai (Doctoral theses at NTNU;2017:356, Doctoral thesis, 2017)