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2015 年 07 月 10 日
Seminar - Nonlocal modeling in computational mechanics By Dr. Adam Martowicz

Date: 10 July 2015 (Friday)

Time: 11:00 am – 12:00 pm

Venue: EF305, The Hong Kong Polytechnic University

Abstract:

This talk will include two parts. In the first part the development of innovative
methods for characterizing the mechanical properties of nanowires, nanobelts and
ultrathin films will be introduced. In the second part the fundamental understanding of
deformation mechanisms of a thin film multilayered structure under mechanical loading
and its removal characteristics involved in abrasive machining will be discussed.

The presentation deals with selected nonlocal modeling techniques for solids, mainly for simulations of elastic waves propagation. Although the idea of a nonlocal modeling for solids is not recent, a significant growth of its applications is observed during last decade, as offering interesting properties for representation of a physical nature of solid matter, especially with introduced geometric nonlinearities. It also features more convenient approach for mitigation of numerical dispersion and more accurate representation of physical dispersion avoiding an excessive increase in model size. The presented cases deal with the simulations of spontaneous growth of damage, crack-wave and vibro-acoustic interaction, acoustic emission and, finally, numerical aspects and quality of modeling tools for computational mechanics, regarding physical and numerical dispersion. The applications of peridynamics and a nonlocal formulation for the finite difference method are shown. The latter is used for mitigation of numerical dispersion, which is the result of time or spatial discretization. Moreover, the results of the study on elastic wave propagation in graphene nanoribbons, performed with peridynamics, are shortly discussed in the context of capability of recovering the physical nature of the reactions at the atomic scale present in a graphene layer.

Bio-sketch:

Adam Martowicz holds the position of an assistant professor and is a postdoctoral researcher in the Department of Robotics and Mechatronics, at the AGH University of Science and Technology in Krakow, Poland. His scientific interests focus on numerical dispersion, multiscale and multiphysics modeling methods for analyses of wave propagation and interaction in the area of NDT and SHM. He is the author of 120 publications, including chapters in books, reviewed journal papers and conference contributions. Adam Martowicz is the recipient of the 2012 AGH-UST Rector’s award for individual achievements in research, and the 2013 scientific scholarship for the outstanding young scientists granted by the Polish Ministry of Science and Higher Education.