A5068685966- Numerical methods in engineering
- Carbon Nanotubes in Composites
- Fluid Dynamics Simulations and Interactions
- Force Microscopy Techniques and Applications
- Composite Material Mechanics
- Aluminum Alloy Microstructure Properties
- Energetic Materials and Combustion
- Graphene research and applications
- Epoxy Resin Curing Processes
- Dam Engineering and Safety
- Geotechnical Engineering and Underground Structures
- Welding Techniques and Residual Stresses
- Nanomaterials and Printing Technologies
- High-Velocity Impact and Material Behavior
- Mechanical and Optical Resonators
- Vibration and Dynamic Analysis
- Risk and Safety Analysis
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Composite Structure Analysis and Optimization
- Chemical Thermodynamics and Molecular Structure
- Fire effects on concrete materials
- Gold and Silver Nanoparticles Synthesis and Applications
- Thermal and Kinetic Analysis
- Advanced Welding Techniques Analysis
Southwest Jiaotong University
2025
Liaoning Technical University
2024
Ansys (United States)
2021-2023
ORCID
2020-2023
University of California, San Diego
2015-2021
Sandia National Laboratories California
2019
Joint Quantum Institute
2016-2017
University of Maryland, College Park
2016-2017
Material Measurement Laboratory
2016-2017
National Institute of Standards and Technology
2016-2017
Short fiber–reinforced composites (SFRCs) are high-performance engineering materials for lightweight structural applications in the automotive and electronics industries. Typically, SFRC structures manufactured by injection molding, which induces heterogeneous microstructures, resulting nonlinear anisotropic behaviors challenging to predict conventional micromechanical analyses. In this work, we present a machine learning–based multiscale method integrating molding–induced material...
A stabilized meshfree formulation for modeling nonlinear, multiphase porous media with application to landslide simulation is presented. To effectively capture the hydromechanical couplings between solid and fluid phases, an efficient equal-order approximation pair adopted in conjunction pressure projection mixed formulation, which avoids spurious oscillations caused by violation of inf-sup condition. Although semi-Lagrangian methods are well-suited extremely large deformation phenomena,...
The resolution of scanning surface potential microscopy (SSPM) is mainly limited by non-local electrostatic interactions due to the finite probe size. Here we present high imaging with ultrasharp and aspect ratio carbon nanotube (CNT) atomic force (AFM) probes fabricated via dielectrophoresis. Enhancement contrast several factors reported for integrated circuit structures purple membrane fragments these CNT AFM as compared conventional probes. In particular, ultrahigh lateral (∼2 nm) images...
Numerical procedures for brittle fracture modeling become tedious when many moving strong discontinuities have to be captured. A smeared approach formulated under the reproducing kernel particle discretization is presented. In this approach, strain computed by divergence operation with a boundary integral of displacements in each nodal representative domain, thus avoiding direct derivatives computation cracking region. To avoid size sensitivity issues, scaling law introduced based on...
We present quantitative kinetic information regarding small, 1-10 μm in diameter, single particle combustion of Zr-rich metal alloy foils subjected to either mechanical impacts or laser-ablation. The lights from fragments were recorded on a high-speed camera. size was determined by the motion analysis individual trajectory based an aerodynamic drag law and further verified microstructure chemical composition recovered post-burn particles. measured sizes show log-normal distribution centered...
SUMMARY A four‐node corotational quadrilateral elastoplastic shell element is presented. The local coordinate system of the defined by two bisectors diagonal vectors generated from four corner nodes and their cross product. This rotates rigidly with but does not deform element. As a result, rigid‐body rotations are excluded in calculating nodal variables global variables. smallest components each orientation vector as rotational variables, leading to desired additive property for all...
In the paper, we present an integrated data-driven modeling framework based on process modeling, material homogenization, mechanistic machine learning, and concurrent multiscale simulation. We are interested in injection-molded short fiber reinforced composites, which have been identified as key systems automotive, aerospace, electronics industries. The molding induces spatially varying microstructures across various length scales, while resulting strongly anisotropic nonlinear properties...
Single-wall carbon nanotube (SWNT) nanofibrils were assembled onto conductive atomic force microscopy (AFM) probes with the help of dielectrophoresis (DEP). This process involved application a 10 V, 2 MHz, AC bias between metal-coated AFM probe and dilute suspension SWNTs. exerted positive dielectrophoretic nanotubes that caused them to align while precipitating out probe. The gradual removal away from SWNT consolidated these into high degree alignment as demonstrated polarization Raman...
Nanocomposite matrices of silver/poly(3-hexylthiophene) (P3HT) were prepared in ultrahigh vacuum through vapor-phase co-deposition. Change microstructure, chemical nature and electronic properties with increasing filler (Ag) content investigated using in-situ XPS UPS, ambient AFM. At least two binding states occur between Ag nanoparticles sulfur P3HT at the immediate contact layer but no evidence interaction carbon (in P3HT) was found. AFM images reveal a change size concentration which...
With the aid of low-energy (500 eV) electron-beam direct writing, patterns perpendicularly-aligned Single-wall carbon nanotube (SWNT) forests were realized on Nafion modified substrates via Fe3+ assisted self-assembly. Infrared spectroscopy (IR), atomic force microscopy (AFM) profilometry and contact angle measurements indicated that cleaved hydrophilic side chains (-SO3H C-O-C) to low molecular byproducts sublimed in ultra-high vacuum (UHV) environment exposing hydrophobic backbone. Auger...