Seminar: Prediction of Nonlinear Fracture Pheonomena Using Cohesive Zone Modeling

Where: 
Mason Building, Room 3132
When: 
Friday, July 14, 2017 - 11:00

 

Dr. Kyoungsoo Park
Associate Professor, Civil and Environmental Engineering
Yonsei University
 
Abstract:

To investigate various nonlinear failure phenomena associated with discontinuous cracks, and/or friction on fracture surface, a cohesive frictional-contact model is developed by integrating the cohesive zone model, the frictional model, and the normal contact model. The traction-separation relationship of the cohesive zone model is based on a potential, i.e., PPR model, while fictional and contact forces are estimated in conjunction with the tangential gap, the normal gap, and the normal gap rate. Additionally, to accurately represent discontinuous cracks in a continuum domain, an element-splitting technique is proposed with a novel stress recovery technique. Then, the proposed computational method is able to provide smooth crack paths, equivalent to GFEM/XFEM, while the condition numbers of the stiffness matrices remain the same order of magnitude. Furthermore, computational results well captures various nonlinear fracture phenomena such as dynamic earthquake rupture, sharing of masonry wallettes, shear cracking of concrete, material failure with microstructures, and others.

Biography:

Kyoungsoo Park is an Associate Professor in the Department of Civil & Environmental Engineering at Yonsei University (Korea). Dr. Park’s educational background includes a B.S. Degree in Civil Engineering from Hanyang University in Seoul, Republic of Korea, and a M.S. and Ph.D. degrees in Civil Engineering from The University of Illinois at Urbana-Champaign with emphasis in cohesive fracture models for the fracture analysis of quasi-brittle materials. He joined the School of Civil and Environmental Engineering at Yonsei University in 2011, worked as an Assistant Professor between 2011 and 2016, and has been an Associate Professor since 2016. Professor Park focuses on computational and experimental mechanics to investigate nonlinear structural behavior at various time and length scales. For instance, he studies dynamic fracture phenomena due to impact loading as well as fatigue failure mechanisms due to cyclic loading. He has been an editorial board member of the International Journal of Concrete Structures and Materials since 2015, an associate editor of the Journal of Civil Engineering (KSCE) since 2013, and technical reviewer of over 20 journals worldwide.