Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/84717
Title: Finite element modeling and characterization of materials
Authors: Swaddiwudhipong, S. 
Keywords: Concrete
Failure surface
Finite element modeling
Instrumented indentation
Material characterization
Neural networks
Size effects
Issue Date: 2006
Source: Swaddiwudhipong, S. (2006). Finite element modeling and characterization of materials. Emerging Trends: Keynote Lectures and Symposia - Proceedings of the 10th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2010 1 : 113-122. ScholarBank@NUS Repository.
Abstract: The paper provides an overview of the work carried out by our group at the Department of Civil Engineering, National University of Singapore on finite element modeling and engineering material characterization. The first part involves finite element modeling of concrete subjected to multi-axial loads requiring a suitable constitutive model and failure surface. A unified failure surface is proposed for various types of concrete and verified against experimental results. A closed-form solution for the state of stress and an expression for the strain at failure in concrete under multi-axial loads are established and incorporated into constitutive models in a finite element package. In the second portion, extensive finite element analyses are performed to investigate the response of elastoplastic materials obeying power-law strain hardening during the instrumented indentation. A reverse analysis algorithm based on results from dual indenters is presented. Direct mapping of the characteristics of the indentation curves to the material properties are carried out using neural network models. When the material and characteristic length scales are of the same order at micron and submicron levels, size effect has to be considered. The conventional mechanism-based strain gradient plasticity, disregarding higher-order stress components, is adopted in the formulation of finite elements resulting in the convenience in the implementation.
Source Title: Emerging Trends: Keynote Lectures and Symposia - Proceedings of the 10th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2010
URI: http://scholarbank.nus.edu.sg/handle/10635/84717
ISBN: 9748257223
Appears in Collections:Staff Publications

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