- Testing and constitutive modeling of plasticity and fracture for new engineering materials including metals and composites
- Studying fundamental mechanisms of plastic deformation and ductile fracture using 3D X-Ray CT imaging, and volumetric digital image correlation (DIC).
- Lightweight designs, sheet metal forming, structural impact and vehicle crashworthiness
- Multi-scale finite element analysis (FEA), material subroutine development
- Mechanics of soft tissue materials including hyperelasticity and fracture
- High velocity impact (including hard body and soft body impacts)
- Experimental techniques development, optical measurement with DIC, and their applications
Area A: Plasticity and fracture of engineering materials
- Calibration of multi-axial stress material yielding, strain hardening, plastic flow, and fracture.
- Effects temperature, high strain rate, and nonlinear loading paths.
- Plasticity model with both stress triaxiality and Lode angle dependencies. Ductile fracture model using Modified Mohr-Coulomb (MMC) criterion and its evolutions (sMMC or eMMC) for different applications.
- Prediction of both fracture initiation and fracture propagation.
- Multi-axial low cycle fatigue of materials.
- Implementation of these models to finite element codes (Abaqus, Ls-Dyna, and VPS).
Area B: Anisotropic mechanical testing and modeling of lightweight metal sheets
- Calibration of anisotropic plastic flow, metal sheet anisotropic strength, and anisotropic fracture.
- Comprehensive plasticity and fracture modeling under mutiaxial loading and nonlinear loading paths using a fully modularized framework.
- Ductile fracture model using Modified Mohr-Coulomb (MMC) criterion and its evolution (sMMC or eMMC).
- Investigated materials: advanced high strength steels (AHSS), aluminum alloy sheets, magnesium alloy sheets, etc.
Area C: Testing, modeling and simulation of various composites
- Biaxial testing and calibration of fracture properties of carbon fiber reinforced polymer matrix composites (PMCs).
- Co-existence of brittle and ductile fracture of metallic matrix nano composites (MMNCs).
- Strength asymmetry and full characterization of mechanical properties for ceramic matrix composites (CMCs).
- Constitutive modeling and implementation to finite element packages as material subroutines (Abaqus, LsDyna, VPS,…).
Area D: Testing, modeling and simulation of soft tissues with medical applications
- Uniaxial and biaxial testing of soft tissue materials.
- Constitutive modeling using anisotropic hyperelastic models, fracture of soft tissues.
- Finite element simulation with a developed material user subroutine.
Area E: Application of fracture mechanics in material advanced manufacturing processes and impact loading
- Metal cutting for alloys and metallic matrix nano composites (MMNCs).
- Metal sheet forming with punching device.
- Nano fragmentation of fiber cables under progressive necking.
- High velocity impact concrete structures.