| Speaker : |
Prof. Seung-Jo Kim (Dept. of Aerospace Engineering, Seoul National University) |
| Subject : |
Numerical Simulation of Mechanical Behavior of Composite Structures by Parallel Supercomputing Technology |
| Date : |
Jun 5, 2006 2:00pm-3:30pm (Lecture room 72, Faculty of Engineering bldg.7, Hongo campus) |
| Outline : |
This paper will examine the possibilities of the virtual tests of composite
structures by simulating mechanical (macro and/or micro) behaviors by using
supercomputing technologies which now become easily available and powerful
but relatively inexpensive. In this paper, we will describe mainly the
applications of large scale finite element analysis for the direct
numerical simulation(DNS) of the composite structures using parallel
supercomputing technology. DNS utilizes the numerical simulation techniques
by describing composite material properties from individual constituent
properties, and develop the modeling tools for micromechanical material
simulations. The numerical modeling examples using a direct numerical
simulation (DNS) in this paper are various composite materials such as
metal matrix composite(MMC), Active Fiber Composites(AFC), Boron/Epoxy
Cross-ply Laminates and 3D orthogonal woven composites to predict the
mechanical properties and structural behaviors of various composite
structures. The DNS is an approach based on the full microscopic concepts,
which can provide detailed information about the local interaction between
the constituents and micro-failure mechanisms by separate modeling of each
constituent. Such a 3D full micro-mechanical modeling is sometimes helpful
to various analyses related to the material characterization and various
structural behaviors from unidirectional laminate composites to 3D woven
composites.
In this paper, the effective elastic moduli of the composites such as fiber
reinforced laminates, active fiber composites and 3D orthogonal woven
composites are determined using the DNS models by large scale finite
element analysis. This DNS models can also give the global and local
information about deformations and influences of high local in-plane and
interlaminar stresses induced by transverse impact loading at a microscopic
level inside the materials. Furthermore, the multiscale models based on DNS
concepts considering microscopic and macroscopic structures simultaneously
are also developed and a numerical low velocity impact simulation is
performed using these multiscale DNS models. Through these various
applications of DNS models, it can be shown that DNS approach can provide
insights of various structural behaviors of composite structures. |
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