Undergraduate/Graduate Studies Information :
- M.S., 1998-2001, Tsinghua University, Beijing, P. R. China
- B.S., 1994-1998, North China University of Technology, Beijing, P. R. China
Current Project Title :
A Voronoi Cell Finite Element Model for Particle Fracture and Matrix Cracking in Particle Reinforced Metal Matrix Composites
Current Status :
Ph.D. Candidate
Summary of Accomplishments :
For the particle reinforced metal matrix composites (PRMMCs), damage initiation at different sites of the microstructure occurs in the form of particle fracture. And the final catastrophic failure in PRMMCs occurs in the form of ductile fracture - matrix cracking that takes place by the nucleation, growth and coalescence of micro-voids. Voids mainly nucleate near the second-phase particles after particle fracture, and grow quickly around the crack-tip with high plastic strain localization, and finally coalesce to cause overall structural failure. And the microstructural morphology, like size, shape, orientation and spatial distribution of particles has an important effect on the process of damage. Within the framework of continuum damage mechanics, a Voronoi Cell Finite Element (VCFEM) scheme implemented with nonlocal Gurson-Tvergaard-Needleman (GTN) model is developed to model the ductile damage in PRMMCs. For the damage initiation, Weibull model is introduced to trigger the particle fracture. And the nonlocal GTN model is introduced to model the final ductile fracture - matrix cracking. The traditional VCFEM is only based on the assumed stress hybrid formulation. So the conventional displacement elements will be adaptively superposed on the softening region to model the ductile fracture to avoid the inherent drawback for material softening due to high plastic strain localization.
Publications :
- Chao Hu, Jiangang Cheng. The multi-media simulation experiments in the teaching of theoretical mechanics, Mechanics In Engineering, Vol.25 No.1, p. 67~69. 2003.
- Chao Hu, Jiangang Cheng, Xibin Han. Multi-media simulation teaching system for the experiments of material strength, Mechanics In Engineering, Vol.24 No.6, p. 68~70, 2002.
Conferences :
- C. Hu, S. Ghosh. A Voronoi Cell Finite Element Model for Particle Fracture and Matrix Cracking in Particle Reinforced Metal Matrix Composites, Proceedings of the 8th US National Congress on Computational Mechanics, 2005.
- C. Hu, S. Moorthy, S. Ghosh. A Voronoi Cell Finite Element Model for Ductile Damage in MMCs, Proceedings of the 8th International Conference on Numerical Methods in Industrial Forming Processes, p. 1893-1898, 2004.
- Chao Hu, Jiangang Cheng. Design and Development of the Virtual Lab of Engineering Mechanics, Proceedings of ICCE 2001-9th International Conference on Computers in Education 2001, Seoul, South Korea.