Publication

Influence of local fiber distribution on tensile behavior of strain hardening UHPFRC using NDT and DIC

Xiujiang Shen
2020
Article
Résumé

This paper introduces the uniformity factor mu(2) for considering the local fiber distribution within elements made with Ultra-High Performance Fiber Reinforced Cementitious Composites (UHPFRC). The influence of mu(2) on the strain-hardening response of UHPFRC under uniaxial tension is investigated quantitatively by means of experimental campaign and mechanical analysis. The uniaxial direct tensile test (DTT) was carried out on dumbbell specimens, extracted from a slab, to characterize the tensile behavior of UHPFRC using digital image correlation (DIC) system. Before DTT, actual fiber distribution of each specimen was measured by non-destructive test (NDT) method. Based on the present results and available literature, it is concluded that mu(2) plays a significant role in tensile strain-hardening response, especially hardening strain epsilon(Utu) and matrix discontinuities energy g(Uf), of UHPFRC. The average mu(2) value for a given UHPFRC structural element is proposed to be applied for scaling the representative tensile response to intended applications.

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Concepts associés (23)
Yield (engineering)
In materials science and engineering, the yield point is the point on a stress-strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior. Below the yield point, a material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible and is known as plastic deformation.
Déformation plastique
La théorie de la plasticité traite des déformations irréversibles indépendantes du temps, elle est basée sur des mécanismes physiques intervenant dans les métaux et alliages mettant en jeu des mouvements de dislocations (un réarrangement de la position relative des atomes, ou plus généralement des éléments constitutifs du matériau) dans un réseau cristallin sans influence de phénomènes visqueux ni présence de décohésion endommageant la matière. Une des caractéristiques de la plasticité est qu’elle n’apparaît qu’une fois un seuil de charge atteint.
Stress–strain curve
In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing). These curves reveal many of the properties of a material, such as the Young's modulus, the yield strength and the ultimate tensile strength. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves.
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MOOCs associés (1)
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Ce cours présente les principes du fonctionnement, du dimensionnement et de la conception des structures. L'approche est basée sur une utilisation de la statique graphique et traite en particulier des