Numerical modelling of the mechanical behaviour of wood fibre-reinforced geopolymers
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O R I G I NA L A RT I C L E
Dan-Andrei Serban ¸ · Gabriel Furtos · Liviu Mar¸savina · Corina So¸ ¸ sdean · Radu Negru
Numerical modelling of the mechanical behaviour of wood fibre-reinforced geopolymers
Received: 31 March 2020 / Accepted: 1 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this work, the mechanical behaviour of composite materials consisting of fly ash-based geopolymer reinforced with wood fibres is investigated for compressive and flexural loadings. The gathered test data were used to calibrate constitutive models for the geopolymer, consisting of the exponential Drucker–Prager yield criterion coupled with the concrete damage plasticity model. The numerical analyses were performed in the commercial software Abaqus, the results being compared with experimental data, yielding good correlations. Keywords Geopolymer composites · Wood fibre reinforcements · Experimental tests · Numerical simulations · Concrete damage plasticity
List of symbols b c d c e¯in in t e¯ E0 E F G h I1σ J2 l
Specimen width Cohesion (shear strength) Crosshead displacement Logarithmic equivalent compressive inelastic strain Logarithmic equivalent tensile inelastic strain Loading slope (initial Young’s Modulus) Unloading slope Recorded load Flow potential Specimen height First invariant of the stress tensor Second invariant of the deviatoric stress tensor Specimen length
Communicated by Andreas Öchsner. D.-A. Serban ¸ (B) · L. Mar¸savina · R. Negru Department of Mechanics and Strength of Materials, Politehnica University Timi¸soara, Timi¸soara, Romania E-mail: [email protected] G. Furtos Department of Dental Composite Materials, Babe¸s-Bolyai University Cluj-Napoca, Cluj-Napoca, Romania C. Sosdean ¸ Department of Mechatronics, Politehnica University Timi¸soara, Timi¸soara, Romania
D.-A. Serban ¸ et al.
L p pt q s¯yc s¯yt σF εF σC εC β δ ε¯ el ε¯ in ε¯ pl ε¯ tot dεp σ¯ σ¯ 0 σ¯ max σ¯ y σyc σyt ν ψ
Support span Hydrostatic pressure Hydrostatic tensile strength Von Mises equivalent stress True equivalent compressive yield stress True equivalent tensile yield stress Flexural stress Flexural strain Compressive engineering strain Compressive engineering strain Friction angle Damage parameter Equivalent elastic strain Equivalent inelastic strain Equivalent plastic strain Equivalent total strain Plastic strain rate vector Eccentricity Equivalent stress Initial equivalent yield stress Material strength Equivalent yield stress Compressive yield stress Tensile yield stress Poisson ratio Dilation angle
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