Our research group will present our latest findings in 7 oral presentations at ASCE Engineering Mechanics Institute Conference at MIT on Thursday (May 31st) and Friday (June 1st) . The schedule of the presentations is listed below in chronological order. Most of the presentations will be given at Room 4-231 (see the map below). Please note that the lectures might not begun on time. 

1. ​​Crystallization-induced fracture talk by former research scientist Dr. Junhyun Choo (now assistant professor at HKU) (MS 47: Room 2-159 11:45am Thursday)
2. Brittle-ductile transition talk by former associate research scientist Dr. Junhyun Choo (now assistant professor at HKU) (MS 27: Room 4-231 3:15pm Thursday)
3. Deep learning enhanced unsaturated poromechanics talk by 4th year PhD student Kun Wang and 1st year PhD student Nikolas Vlassis (MS 27: Room 4-231 4:45pm Thursday)
4. Micromrocphic regularization talk by 4th year PhD student SeonHong Na (MS 27: Room 4-231 5:00pm Thursday)
5. Crystalline rock salt talk by 4th year PhD student SeonHong Na (MS 27: Room 4-231 5:15pm Thursday)
6. Hybridization of hand-crafted and machine learning models talk by 4th year PhD student Kun Wang (MS 27: Room 4-231 5:30pm Thursday)
7. Mixed-mode phase field fracture talk by 2nd year PhD student Eric Bryant (MS 27: Room 4-231 9:30am Friday)

Part of the research findings have been published in the following journal articles: 

1. J. Choo", W.C. Sun, Coupled phase-field and plasticity modeling of geological materials: From brittle fracture to ductile flow,  Computer Methods in Applied Mechanics and Engineering, 330:1-32, doi:10.1016/j.cma.2017.10.009, 2018. [PDF][Bibtex]
2. J. Choo", W.C. Sun, Cracking and damage from crystallization in pores: Coupled chemo-poro-mechanics and phase-field modeling, Computer Methods in Applied Mechanics and Engineering, 335:347-379, doi:10.1016/j.cma.2018.01.044, 2018.​[PDF][Bibtex]
3. K. Wang, W.C. Sun,   A multiscale multi-permeability poroplasticity model linked by recursive homogenizations and deep learning​, Computer Methods in Applied Mechanics and Engineering, 334(1):337-380, doi:10.1016/j.cma.2018.01.036, ​2018. [PDF][Bibtex]
4. S. Na, W.C. Sun, Computational thermomechanics of crystalline rock. Part I: a combined multi-phase-field/crystal plasticity approach for single crystal simulations, Computer Methods in Applied Mechanics and Engineering, doi:10.1016/j.cma.2017.12.022, 2018.
5. ​W.C. Sun, T-F. Wong, Prediction of hydraulic and electrical transport properties of sandstone with multiscale lattice Boltzmann/finite element simulation on microtomographic images, International Journal of Rock Mechanics and Mining Sciences, 106, 269-277, doi:10.​1016/​j.​ijrmms.​2018.​04.​020, 2018. 

PhD candidate SeonHong Na has received two special honors from Columbia University, (1) the Mindlin Scholarship and (2) the Teaching Assistant Excellence Award. 

1. The Mindlin scholarship is given to a graduate student in the Columbia Engineering school who demonstrates superior achievement, integrity, curiosity and creativity. The Mindlin scholarship is established by the Mindlin family and the SEAS in honor of the three Mindlin brothers (Eugene as an engineer and businessman, Raymond as a scientist and professor at Columbia, and Rowland as a physician and public health administrator).  


2. The Teaching Assistant Excellence Award is given to graduate student who has superior achievement as a teaching assistant in the Department of Civil Engineering and Engineering Mechanics. This is the second time SeonHong received this award. 

Congratulations for these wonderful achievements! 

Our new paper on prediction of permeability and formation factor of sandstone with hybrid lattice Boltzmann/finite element simulation on microtomographic images has published in IJRMMS. In this work, we compare the hybrid lattice Boltzmann/finite element calculation with experimental data on Fontainebleau sandstone specimens of a variety of porosity. We found that the LB simulations actually yield quite accuracy predictions, both on formation factor and permeability tensors. Special thanks for my co-author Professor Teng-fong Wong from Chinese University of Hong Kong who taught me a lot during the research. [URL]