A5068499351- Microstructure and mechanical properties
- Aluminum Alloys Composites Properties
- Fusion materials and technologies
- Metal and Thin Film Mechanics
- Advanced materials and composites
- High-Velocity Impact and Material Behavior
- High Temperature Alloys and Creep
- Hydrogen embrittlement and corrosion behaviors in metals
- High-pressure geophysics and materials
- Advanced ceramic materials synthesis
- Material Dynamics and Properties
- Force Microscopy Techniques and Applications
- Composite Material Mechanics
- Nonlocal and gradient elasticity in micro/nano structures
- High Entropy Alloys Studies
- Aluminum Alloy Microstructure Properties
- Smart Materials for Construction
- Intermetallics and Advanced Alloy Properties
- Glass properties and applications
- Civil and Geotechnical Engineering Research
- Fiber-reinforced polymer composites
- Nuclear Materials and Properties
- Polymer Nanocomposites and Properties
- Machine Learning in Materials Science
- Aerogels and thermal insulation
Iowa State University
2015-2023
Schlumberger (United States)
2023
Tianjin University
2014
The superior strength-ductility combination in nanotwin (NT)-strengthened metals has provided a new potential for optimizing the mechanical properties of coarse-grained (CG) metals. In this paper computer simulations based on mechanism-based strain gradient plasticity and Johnson–Cook failure criterion have been carried out to uncover critical factors that serve provide dual function. Our results indicate both distribution characteristics NT regions constitutive relations phase can...
The stress tensor is described as a symmetric in all classical continuum mechanics theories and most existing statistical formulations. In this work, we examine the theoretical origins of symmetry identify assumptions misinterpretations that lead to its property. We then make direct measurement molecular dynamics simulations four different material systems using physical definition force per unit area acting on surface elements. Simulation results demonstrate asymmetric near dislocation...
Coarse-grained (CG) metals strengthened by nanotwinned (NT) regions have both ultrahigh strength and good ductility. The presence of the NT contributes to their strength, while ductility is attributed recrystallized coarse grains. These characteristics make them a potential candidate for bullet-proof material. In this paper, numerical simulations based on mechanism-based strain gradient plasticity Johnson–Cook failure criterion are carried out investigate effects twin spacing microstructural...
In this paper, we present concurrent atomistic-continuum (CAC) simulations of the hydrogen (H) diffusion along a grain boundary (GB), nearby which large population dislocations are piled up, in plastically deformed bi-crystalline bcc iron sample. With microscale dislocation slip and atomic structure evolution at GB being simultaneously retained, our main findings are: (i) accumulation tens near H-charged can induce local internal stress as high 3 GPa; (ii) more up GB, slower H ahead slip–GB...
Nanostructured metals with bimodal grain size distribution, composed of coarse grains (CG) and nanograins regions, can have high strength good ductility. Here, numerical simulations, based on the mechanism-based strain gradient plasticity, micromechanical composite model Johnson-Cook failure model, investigate effects distribution characteristics shape CG regions fracture behavior nanostructured metals. Simulations show that both them directly influence load response, energy dissipation...
The microstructure of oil pipeline steels is polycrystalline due to the presence a complex grain boundary (GB) network in them. performance them when exposed stresses corrosive environments largely dictated by interplay between hydrogen (H) diffusion, dislocation slip, and their interactions with GBs. However, slip-GB interaction H subsequent cracking along GBs remains not fully understood up date. It challenging simultaneously resolve collective motions away from together diffusion near...
In this paper, we perform concurrent atomistic-continuum (CAC) simulations to (i) characterize the internal stress induced by microscale dislocation pileup at an atomically structured interface; (ii) decompose into two parts, one of which is from dislocations behind tip according Eshelby model and other a super-dislocation model; (iii) assess how such stresses contribute atomic-scale phase transformations (PTs), reverse PTs, twinning. The main novelty work unify atomistic description...
Adopting bcc tungsten (W) as a model material, we characterize the temperature and stress dependence of kink dynamics on dislocation line with length L ranging from 60 nm to 1 μm using finite-temperature coarse-grained (FT-CG) atomistic simulations. The main novelty this work is accommodate major salient aspects, namely motion am-long lines, atomic-scale dynamics, full spectrum phonon all in one single FT-CG model. Several findings arise our simulations: flow stress, σf, not only depends...