Sheng-Nian Luo
Southwest Jiaotong University
OpticsPhysicsDeformation (engineering)Composite materialChemistryMaterials scienceDiffractionCondensed matter physicsSuperheatingGrain boundaryLaserMolecular dynamicsNucleationSpallCrystal twinningShock waveCrystallographyShock (mechanics)MicrostructureThermodynamics
296Publications
32H-index
3,948Citations
Publications 273
Newest
#1Sen ZhangH-Index: 2
Last. Sheng-Nian Luo (Southwest Jiaotong University)H-Index: 32
view all 6 authors...
Abstract Three-dimensional carbon honeycombs (3D C-honeycombs) are considered as a promising matrix material for new composites, while their mechanical behaviors under complex stress status remain unclear. Here, shear response of 3D C-honeycombs is systematically investigated with molecular dynamics (MD) simulations and mechanical analysis. Two deformation modes are observed for 3D C-honeycombs under in-plane and out-of-plane shear loading. A mechanical model is proposed to describe the deformat...
Source
#1Wenrui Li (Chongqing University)
#2Jun Li (Chongqing University)H-Index: 125
Last. Sheng-Nian Luo (Southwest Jiaotong University)H-Index: 32
view all 5 authors...
The H-abstraction reaction kinetics of methyl acrylate (MA) + H/OH/CH3/HO2 radicals have been investigated theoretically in the present work. For these reactions, the reaction energies and barrier heights are first computed using several density functionals and compared to the coupled cluster CCSD(T)-F12/jun-cc-pVTZ benchmark calculations. The M062X/maug-cc-pVTZ method shows the best performance with the smallest mean unsigned deviation (MUD) of 0.42 kcal mol-1. Combined with the electronic stru...
Source
Abstract Penetration into granular materials such as carbonate sand is of fundamental importance to granular physics, and impact and civil engineering, but research along this line suffers considerably from the lack of direct experimental observations. Here we investigate such penetration dynamics of carbonate sand using a vertical gas gun implemented with in situ, high-speed, synchrotron-based X-ray phase contrast imaging. The experiments yield the first direct observation on the penetration dy...
Source
#1K. Yang (Southwest Jiaotong University)
#2C. Li (Southwest Jiaotong University)
Last. Yaqi CaiH-Index: 71
view all 6 authors...
Abstract Deformation twinning in a medium carbon steel containing ferrite and pearlite under shock compression is investigated below and above the α − e phase transition stress (σT), within a peak stress range of 10–20 GPa. Free surface velocity histories are measured to obtain the Hugoniot elastic limit (2.7 GPa), σT (13.3 GPa) and bulk plastic strain. Postmortem samples are characterized with electron backscatter diffraction and transmission electron microscopy. Below σT, all the {112}⟨111⟩ tw...
Source
Abstract We investigate deformation twinning in a highly textured magnesium alloy plate of Mg-3.1%Al-0.9%Zn-0.4%Mn under edge-on impact with in situ, synchrotron-based, ultrafast X-ray diffraction measurements, and corresponding stress states are simulated with the finite element method. Deformation twinning and its anisotropy under the triaxial stress condition are explained by a statistical analysis of resolved shear stress. The critical resolved shear stress criterion is applicable under comp...
Source
#1Xiaoxi Li (Southwest Jiaotong University)H-Index: 13
#2C. Li (Southwest Jiaotong University)H-Index: 3
Last. Sheng-Nian Luo (Southwest Jiaotong University)H-Index: 32
view all 5 authors...
Abstract Interactions between slip bands (SBs) and interfaces in a compressed duplex stainless steel (DSS) are investigated regarding the roles of grain boundaries (GBs) and phase boundaries (PBs) in plastic deformation. Digital image correlation based on scanning electron microscopy, and electron backscatter diffraction are utilized to characterize SBs in ferrite and austenite phases, and the interactions between interfaces and SBs: slip transmission, slip blockage and non-intersection. Most fe...
Source
Abstract Multiple ballistic impacts are carried out on a 2024-T4 aluminum alloy by spherical steel projectiles (5-mm diameter) at ∼ 400 m s − 1 , to investigate its dynamic deformation and damage. The ballistic impact process is captured with high-speed photography. Postmortem samples are characterized with optical imaging, three-dimensional laser scanning, microhardness testing and electron backscatter diffraction. With increasing number of impacts, crater diameter increases slightly, but crate...
Source
#1Yang Mi (Southwest Jiaotong University)H-Index: 1
#2Lei Kong (Southwest Jiaotong University)
Last. Sheng-Nian LuoH-Index: 32
view all 5 authors...
Upconversion micro/nanolasers are promising in fundamental physics research and practical applications. However, due to the limitation of gain medium and cavity quality, such lasers still suffer from a high lasing threshold (Pth). Herein, upconverted whispering-gallery-mode lasing by two-photon absorption is achieved from CdS nanoplatelets with single-mode emission and low threshold (~1.2 mJ cm-2). The threshold is three times lower than the best reported value in previous CdS upconversion laser...
Source
Last. Sheng-Nian Luo (Southwest Jiaotong University)H-Index: 32
view all 5 authors...
DATAD, a Python-based X-ray diffraction simulation code, has been developed for simulating one- and two-dimensional diffraction patterns of a polycrystalline specimen with an arbitrary texture under an arbitrary deformation state and an arbitrary detection geometry. Pixelated planar and cylindrical detectors can be used. The basic principles and key components of the code are presented along with the usage of DATAD. As validation and application cases, X-ray diffraction patterns of single-crysta...
Source
#1X.X. Guan (Southwest Jiaotong University)
#2L. Lu (Southwest Jiaotong University)H-Index: 12
Last. D. FanH-Index: 1
view all 4 authors...
Abstract In situ scanning electron microscope (SEM) and electron back scattering diffraction (EBSD) are used to investigate detwinning deformation of pre-twinned titanium under uniaxial tension. An electro-polishing procedure is optimized to prepare SEM speckles on the Ti samples with minimum interference with EBSD characterization. Strain fields are obtained from the SEM images via digital image correlation. The experimental results suggest that the rate of detwinning decreases with increasing ...
Source