This study examines the manufacturability of γ/γ' cobalt-based superalloys using Directed Energy Deposition (DED). Due to their complex chemical composition, these alloys are highly sensitive to liquid phase cracking mechanisms, particularly at high angle grain boundaries. The cracking sensitivity of two alloys is investigated in relation to chemic...
Les digues et barrages comprennent souvent des éléments en sols fins (argile et/ou limon) qui sont sensibles à l’environnement hydrique atmosphérique de l’ouvrage. Suivant la teneur en eau initiale et la densité sèche initiale, des fissures de retrait peuvent apparaitre en période sèche en climat tempéré. Leur profondeur est limitée, sachant que l’...
This paper presents the use of a specific layer-wise approach to analyze the results of a FABAC accelerated loading test (ALT) carried out on a flexible pavement with an initial flaw. The approach relies on M4-5n (Multi-particular Model of Multilayer Materials) initially developed for the analysis of debonding in composite materials. M4-5n was rece...
AAR and DEF can lead to the development of severe cracking in structures. Both reactions are often associated with high cementcontent mixes: AAR because of the increased availability of alkalis, DEF because the heat of cement hydration can lead to temperaturesover 65 ?C, above which sulphates lead to the delayed formation of expansive ettringite. H...
AAR and DEF can lead to the development of severe cracking in structures. Both reactions are often associated with high cement content mixes: AAR because of the increased availability of alkalis, DEF because the heat of cement hydration can lead to temperatures over 65 ?C, above which sulphates lead to the delayed formation of expansive ettringite....
International audience
Published in Sensors (Basel, Switzerland)
The present study investigated the strain response of a distributed optical fiber sensor (DOFS) sealed in a groove at the surface of a concrete structure using a polymer adhesive and aimed to identify optimal conditions for crack monitoring. A finite element model (FEM) was first proposed to describe the strain transfer process between the host str...
Published in Sensors (Basel, Switzerland)
In this paper, we study the strain transfer mechanism between a host material and an optical fiber. A new analytical model handling imperfect bonding between layers is proposed. A general expression of the crack-induced strain transfer from fractured concrete material to optical fiber is established in the case of a multilayer system. This new stra...
The identification of crack growth models requires the knowledge of the crack path geometry and, in particular, of the crack tip position. The objective of the present paper is to provide a criterion for the detection of the crack tip position regardless of the loading conditions or the material behavior. The novelty of the proposed approach is its...
