Browsing by Author "Lombardi, G."
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- Constitutive models for numerical analysis of the short- and long-term behavior of geosynthetics and mechanical damagePublication . Lombardi, G.; Paula, António Miguel; Lopes, Margarida PinhoAnalyse the tensile response of different geosynthetics; Apply constitutive models to describe the nonlinear tensile behaviour of these materials in the short- and the long-term, before and after damage; Propose model parameters for intact and damaged specimens.
- Constitutive models for numerical analysis of the short- and long-term behavior of geosynthetics and mechanical damagePublication . Lombardi, G.; Paula, António Miguel; Lopes, Margarida Pinho; Pereira, A.B.Assess the tensile response of a geosynthetic in the short- and long-term Analyze damaged and undamaged specimens Fit tensile load vs. strain curves using constitutive models Estimate damaged tensile properties from model parameters of undamaged specimens. Extrapolate creep data Estimate long-term tensile properties from short-term model parameters
- Hyperbolic models to represent the effect of mechanical damage and abrasion on the short-term tensile response of a geocompositePublication . Lombardi, G.; Pinho-Lopes, Margarida; Paula, António Miguel; Bastos, AntónioThe objective of this study was to analyse the short-term tensile response of a geocomposite (a geotextile and a geogrid overlapped) and apply hyperbolic models to describe its load-strain tensile curves. Data from specimens submitted to mechanical damage, abrasion, and mechanical damaged followed by abrasion were analysed. Reduction factors were proposed by comparing data from damaged specimens with those from undamaged specimens. The experimental results were compared with those fitted by the constitutive models to validate the model. The constitutive models demonstrated good fitting capacity. For any mechanical condition, the model parameters could be estimated by relating the experimental tensile properties of the geocomposite with adjustment coefficients, which allowed for describing the tensile load-strain curves with good accuracy. The reduction factors for the specimens subjected to mechanical damage followed by abrasion were lower than the values which would be obtained if the damages were considered individually.