Research interest:► Micromechanics of Composite Materials► Damage and Fracture of Composite Materials► Piezoelectric Composite Materials► Lightweight Vehicle Structures► Vehicle Crash and Safety

Research interest:► Micromechanics of Composite Materials► Damage and Fracture of Composite Materials► Piezoelectric Composite Materials► Lightweight Vehicle Structures► Vehicle Crash and Safety

(Onsite engineer through Engineering Technology Associates, Inc)1. Advanced CAE modelling of vehicle subsystems and enhancement of full-vehicle crash analysis► Incorporated advanced CAE features into tire system, such as material failure, advanced contacts► Incorporated pre-loaded springs into vehicle suspension models► Developed testing procedures to validate kinematics of suspension CAE models► Enhanced the full-vehicle crash analysis by including above advanced CAE features ► Those advanced modelling practices are adopted as the FORD Global CAE Best Practices2. Ford Global Safety CAE Process Development► Development of Tire Generator, which is utilized to automatically generate tire models for various FORD vehicle programs. ► Development of Tire Positioner, which is utilized to position tires to suspensions and creates all relevant FEA features, like pre-loading, angular velocity, etc.► Those processes are the Ford Global processes which are utilized globally 3. LS-DYNA Validation for Ford Global Safety and Management of Dummy Models from Suppliers► Established a comprehensive full-vehicle model library by selecting models from Ford of North America, Ford of Europe, Ford of China, etc. ► Established a complete procedure to validate the latest released solver for the FORD Global Safety community ► Managed multi-million dollar CAE dummy library and ensured the delivered dummy models aligned with FORD internal processes

1. Investigation of damage evolution in heterogeneous materials► Developed an efficient numerical tool in modeling crack initiation and propagation with excellent stability► Validated the method’s accuracy in modeling interfacial debonding with developed analytical solutions and Abaqus► Simulated the damage evolution in laminates on the fly by considering transverse cracking and delamination►Uncovered new fundamental findings in debonding behaviors of SiC/Ti and graphite/polyimide composites 2. Micromechanics analysis of fiber-reinforced periodic materials via Abaqus► Created unit cells in Abaqus CAE and automated the application of periodic conditions via python script.► Applied unit strain and analyzed the unit cell 6 times to obtain a complete set of homogenized properties.►Simulated the fiber/matrix debonding via cohesive elements and generated the macro-responses3. Finite deformation analysis and optimization of bio-inspired materials► Developed an efficient homogenization-based Particle Swarm Optimization (PSO) method.► Verified the newly developed optimization approach via extensive parametric studies ► Optimized unit cell architectures and material properties of heart-valve chordae tendineae using parallelized algorithm ► Research results are published in a journal article and featured by the Global Medical Discovery website.4. Plastic strain localization in periodic materials with wavy brick-and-mortar architectures► Directed the research work of 3 fourth year undergraduates and published one peer-reviewed journal article. ► Systematically examined the combined effects of waviness and platelet arrangement on the elastic-plastic response of periodic materials with bio-inspired microstructures with wavy architectures.

► Consulting Project" Industrial consulting project on 3D arbitrary cracking modeling via 3D cohesive elements with Abaqus"1) Utilized python to insert 2D cohesive elements between arbitrary adjacent 2D solid elements by generating new nodes2) Extruded 2D mesh to 3D mesh and adjusted the nodal connectivity of the 3D cohesive elements3) Successfully delivered a 3D fracture simulation workflow for the customer under various loading types by taking into contacts► Training: 1) Extensive training with Abaqus in Modeling Fracture and Failure, Writing User Subroutines, Contact and Convergence Issue, Flexible Multibody Systems, Abaqus/Explicit: Advanced Topics, Linear Dynamics 2) Training in Fe-safe (fatigue package), Isight (automation and optimization package), Tosca (topology optimization) and 3DEXPERIENCE platform► Support and Other Activities 1) Resolved customer problems in a timely manner through independent research and by collaborating with team members2) Critically examined all workshops in the training class of Analysis of Composite Materials with Abaqus 6.14 and Abaqus 2016 and carefully revised the workshop notes, models’ python script files3) Prepared workshops for University of Minnesota and Boeing and created 3DEXPERIENCE workshops

1. Study of the delamination of fiber/Aluminum laminates under low-velocity impact► Simulated delamination between single plies via Cohesive Zone Model (CZM) in LS-DYNA.► Quantitated plastic effects of Al plies in absorbing impact energy and in reducing delamination between plies.► Identified the preferred stacking sequence for laminates with strong delamination resistance.2. Strength analysis and optimization of Carbon Fiber Reinforced Plastic (CFRP) joints► Designed CFRP joints with AutoCAD and created 3D finite element model in ANSYS.► Predicted the delamination bearing strength of CFRP joints considering contact effects.► Optimized the delamination bearing strength via PSO approach by varying ply angles.

1. Stress and strength analysis of tube connections on air cooled heat exchanger► Built 3D finite element model in ANSYS from technical drawing provided by collaborated company.► Carried out stress analysis to check stress distribution at tube connections and verified the strength of steel.