Multiscale modelling framework for elasticity of ultra high strength concrete using nano/microscale characterization and finite element representative volume element analysis
•FE-RVE and MFH methods can be used to homogenize elastic modulus across multiscales.•FE-RVE method can be used to obtain local variation of micro fields inside the RVE.•Variation in the homogenized modulus with different particle shapes is negligible.•Various boundary conditions such as PBCs, SUBCs...
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Veröffentlicht in: | Construction & building materials 2022-04, Vol.327, p.126968, Article 126968 |
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Sprache: | eng |
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Zusammenfassung: | •FE-RVE and MFH methods can be used to homogenize elastic modulus across multiscales.•FE-RVE method can be used to obtain local variation of micro fields inside the RVE.•Variation in the homogenized modulus with different particle shapes is negligible.•Various boundary conditions such as PBCs, SUBCs and KUBCs are applied.•Proposed geometry generation algorithm can generate RVEs with high volume fractions.
Ultra-High Strength Concrete (UHSC) (greater than 100 MPa) is a mechanically superior material compared with the Normal Strength Concrete (NSC) due to its inherent performance characteristics. Improved modulus of elasticity is one of the key target characteristics in the development of UHSC. Macroscopic response of UHSC is a result of a multitude of phases in different spatial length scales such as mesoscale, microscale, nanoscale etc. and investigating these spatial scales can yield a better understanding about contribution of each heterogenous phases to the macroscopic behaviour of UHSC. In this paper, a new multiscale modelling method including procedures to obtain micro/nano scale properties is proposed to predict the macroscopic elastic modulus using nanoindentation experiments, hydration simulations, Scanning Electron Microscopy (SEM) and Finite Element Representative Volume Element (FE-RVE) modelling.
Characterization of nanomechanical properties of the cementitious composite was carried out using nanoindentation, microstructural characterization was performed using scanning electron microscopy, and hydration simulation of the cementitious paste was carried out using Virtual Cement and Concrete Testing Laboratory (VCCTL) software. A five-level multiscale framework is proposed for UHSC and results from these experimental testing and simulations were used as inputs in the proposed framework.
A novel algorithm which can model any volume fraction of different phases was developed to generate geometries for RVEs to be used in FE-RVE simulations. Upscaling of elastic modulus using FE-RVE was found to be very accurate, and this method can generate detailed variation of microfields inside the RVE. A parametric study was carried out on how varying inhomogeneities in the RVE, boundary conditions, and the shape of the inhomogeneities would affect the homogenized elastic modulus.
Continuum micromechanics models such as Mori-Tanaka method and Self Consistent Scheme were used for the analytical homogenization at each scale for comparison with FE-RVE method. The |
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ISSN: | 0950-0618 1879-0526 |
DOI: | 10.1016/j.conbuildmat.2022.126968 |