Material characterization based on micro-structural computations and homogenization

authored by: Peter Wriggers, M. Hain
Abstract: Based on a micro-structural finite-element model using computer-tomography scans at micro meter length-scale, damage due to frost within hardened cement paste (HCP) is evaluated. In order to establish microscopic constitutive equations comparison with experimental data at macro-level are performed together with parameter identification. Subsequently, damage due to frost is simulated numerically: the water filled pores of HCP increase in volume during a freezing process which yields an inelastic material behavior. Numerical simulations at micro-structural level are performed for different moistures and temperatures. Upscaling then leads to an effective correlation between moisture, temperature and the inelastic material behaviour. Finally, thermomechanically coupling is introduced on the macro-scale and an effective constitutive equation for HCP is developed using the abovementioned temperature-moisture-damage correlation.
Organisation(s): Institute of Continuum Mechanics
External Organisation(s): Daimler AG
Type: Conference contribution
Pages: 15-26
No. of pages: 12
Publication date: 2008
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Civil and Structural Engineering, Automotive Engineering, Aerospace Engineering, Acoustics and Ultrasonics, Mechanical Engineering
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{d941f5c36c7d4dff85342105c62d16da,
title = "Material characterization based on micro-structural computations and homogenization",
abstract = "Based on a micro-structural finite-element model using computer-tomography scans at micro meter length-scale, damage due to frost within hardened cement paste (HCP) is evaluated. In order to establish microscopic constitutive equations comparison with experimental data at macro-level are performed together with parameter identification. Subsequently, damage due to frost is simulated numerically: the water filled pores of HCP increase in volume during a freezing process which yields an inelastic material behavior. Numerical simulations at micro-structural level are performed for different moistures and temperatures. Upscaling then leads to an effective correlation between moisture, temperature and the inelastic material behaviour. Finally, thermomechanically coupling is introduced on the macro-scale and an effective constitutive equation for HCP is developed using the abovementioned temperature-moisture-damage correlation.",
keywords = "Cement paste, Damage, Finite elements, Frost, Multi-scale",
author = "Peter Wriggers and M. Hain",
year = "2008",
language = "English",
isbn = "9781402090899",
series = "IUTAM Bookseries",
pages = "15--26",
booktitle = "IUTAM Symposium on Theoretical, Computational and Modelling Aspects of Inelastic Media - Proceedings of the IUTAM Symposium",
note = "IUTAM Symposium on Theoretical, Computational and Modelling Aspects of Inelastic Media ; Conference date: 14-01-2008 Through 18-01-2008",
}