Microstructure Guided Simulations to Predict the Effective Mechanical Properties of Cementitious Materials.

Author(s): Sumanta Das, Gaurav Sant, Nikhilesh Chawla and Narayanan Neithalath
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 527-536
Total Pages: 10
Language : English

Abstract: A microstructure-guided modeling approach is explained in this paper to predict the effective elastic response of heterogeneous materials. The methodology is validated for a fly ash geopolymer which contains four different microstructural phases of varying elastic properties. The intrinsic elastic properties required for numerical simulation are extracted from a statistical nanoindentation experiment on polished geopolymer samples using the continuous stiffness method. Backscattered scanning electron microscopy on plain polished sections of the geopolymer was used to obtain the area (volume) related information of the different phases. The virtual 3D periodic microstructure is generated using the experimental microstructural information and used as a basis for strain-controlled numerical simulation scheme in the linear elastic range to predict the elastic modulus as well as the stresses in the microstructural phases. The elastic modulus of the composite material predicted from the microstructure-based constitutive modeling approach correlates very well with experimental measurements. This technique thus links the microstructure to mechanical properties of interest and helps develop material design guidelines for novel heterogeneous composites

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00

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