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Stress-strain modeling of EPS geofoam for large-strain applications
Expanded polystyrene (EPS) geofoam is a material that has been used in many countries as a lightweight and compressible geomaterial. Particularly in Japan, where construction on weak soils is inevitable, the use of EPS has seen a steady increase over the last decade. Both small- and large-strain applications of EPS geofoam involve interactions with the surrounding geologic materials. The stress-deformation response of this material, however, differs significantly from those of the adjoining geologic materials. A well-justified constitutive law for EPS is, thus, a prerequisite for reliable solutions for soil-structure interaction problems where such material is used. This paper describes a stress-strain law for EPS geofoam for its large-strain applications based on the incremental theory of plasticity. In the derivation of the constitutive relationship, the geofoam was taken as a von Mises material, and it was assumed that the hardening regime follows a hyperbolic curve. The material parameters of the constitutive model were determined from a series of unconfined compression tests performed on EPS specimens of various sizes, shapes and densities. These parameters are functions of the absolute dimensions of the tested specimens as well as the density of EPS. The validity of the model was confirmed by numerical simulations on the compression testing program of EPS geofoam.
Stress-strain modeling of EPS geofoam for large-strain applications
Expanded polystyrene (EPS) geofoam is a material that has been used in many countries as a lightweight and compressible geomaterial. Particularly in Japan, where construction on weak soils is inevitable, the use of EPS has seen a steady increase over the last decade. Both small- and large-strain applications of EPS geofoam involve interactions with the surrounding geologic materials. The stress-deformation response of this material, however, differs significantly from those of the adjoining geologic materials. A well-justified constitutive law for EPS is, thus, a prerequisite for reliable solutions for soil-structure interaction problems where such material is used. This paper describes a stress-strain law for EPS geofoam for its large-strain applications based on the incremental theory of plasticity. In the derivation of the constitutive relationship, the geofoam was taken as a von Mises material, and it was assumed that the hardening regime follows a hyperbolic curve. The material parameters of the constitutive model were determined from a series of unconfined compression tests performed on EPS specimens of various sizes, shapes and densities. These parameters are functions of the absolute dimensions of the tested specimens as well as the density of EPS. The validity of the model was confirmed by numerical simulations on the compression testing program of EPS geofoam.
Stress-strain modeling of EPS geofoam for large-strain applications
Spannungs-Dehnungs-Modellierung von EPS-Geoschaum für Anwendungen mit hohen Dehnungswerten
Hazarika, Hemanta (author)
Geotextiles and Geomembranes ; 24 ; 79-90
2006
12 Seiten, 12 Bilder, 2 Tabellen, 37 Quellen
Article (Journal)
English
Stress–strain modeling of EPS geofoam for large-strain applications
| Elsevier | 2005
Stress–strain modeling of EPS geofoam for large-strain applications
| Online Contents | 2006
Small-strain Stress-strain Properties of Expanded Polystyrene Geofoam
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Rate Effects on the Stress-strain Behaviour of EPS Geofoam
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