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A platform for research: civil engineering, architecture and urbanism
Preliminary study of multiscale analysis in fibre reinforced concrete
Abstract The Reactive Powder Concrete (RPC), is made of a very fine homogeneous and compact matrix, with short steel fibres (added to create pseudo-strain-hardening). The bridging fibre action is beneficial to increase, in fact, the stress carried across the crack. To optimise the mechanical behaviour of this new generation of concrete, the influence of the orientation of fibres due to the process of casting must be taken into account. The purpose of this study is to understand the effect of the orientation of fibres on the damage process. A multiscale modelling is investigated theoretically by considering a locally oriented mass of fibres embedded in a homogeneous matrix. An inclusion model provides a description of the microstructural stress and strain concentration and a model for crack initiation based on stress intensity factor is developed. Analytical expressions are obtained for the maximum principal stresses inside the inclusion and in the matrix. It is shown that, under uniaxial tension, an orientation between 40° and 60° for the inclusion can induce a tensile stress in the matrix at the inclusion-matrix interface and nucleate a crack parallel to the direction of loading.
Preliminary study of multiscale analysis in fibre reinforced concrete
Abstract The Reactive Powder Concrete (RPC), is made of a very fine homogeneous and compact matrix, with short steel fibres (added to create pseudo-strain-hardening). The bridging fibre action is beneficial to increase, in fact, the stress carried across the crack. To optimise the mechanical behaviour of this new generation of concrete, the influence of the orientation of fibres due to the process of casting must be taken into account. The purpose of this study is to understand the effect of the orientation of fibres on the damage process. A multiscale modelling is investigated theoretically by considering a locally oriented mass of fibres embedded in a homogeneous matrix. An inclusion model provides a description of the microstructural stress and strain concentration and a model for crack initiation based on stress intensity factor is developed. Analytical expressions are obtained for the maximum principal stresses inside the inclusion and in the matrix. It is shown that, under uniaxial tension, an orientation between 40° and 60° for the inclusion can induce a tensile stress in the matrix at the inclusion-matrix interface and nucleate a crack parallel to the direction of loading.
Preliminary study of multiscale analysis in fibre reinforced concrete
Plé, O. (author) / Bayard, O. (author)
2002
Article (Journal)
English
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