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136 results on '"Briffod, Fabien"'

29. Materials Informatics Approach to Cu/Nb Nanolaminate Microstructure Correlations with Yield Strength and Electrical Conductivity.

Author

Takayuki Shiraiwa, Koki Yasuda, Briffod, Fabien, Jhon, Mark, Gunawan, Fergyanto, Sahay, Rahul, Raghavan, Nagarajan, Budiman, Arief S., and Manabu Enoki

Subjects
COPPER, ELECTRIC conductivity, YIELD stress, FINITE element method, BETTI numbers, DESCRIPTOR systems
Abstract

Empirical formulas were derived for the interface shape, mechanical properties, and electrical characteristics of accumulative roll bonded (ARB) Cu/Nb laminated materials, based on relevant literature data. These formulas were incorporated into a forward analysis model using finite element analysis, enabling the calculation of yield stress and conductivity from the spatial distribution of Cu/Nb two phases. By randomly varying the layer thickness and interface shape in the two-phase spatial distribution and conducting repeated forward analyses, a database linking microstructural descriptors with yield stress and conductivity was created. These microstructural descriptors include volume fraction, geometric features, topological features, spatial correlation functions, and persistent homology. The significance of each microstructural descriptor on yield stress and conductivity was quantified using machine learning techniques. The results revealed that the Cu volume fraction, layer thickness, and 0th Betti number are crucial for yield stress, while for conductivity, the Cu volume fraction has the strongest influence, followed by layer thickness and layer continuity. Based on these outcomes, the Pareto front for ARB Cu/Nb laminates in the strength-conductivity space was presented. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Using Global Existing Fiber Networks for Environmental Sensing

Author

Ip, Ezra, primary, Ravet, Fabien, additional, Martins, Hugo, additional, Huang, Ming-Fang, additional, Okamoto, Tatsuya, additional, Han, Shaobo, additional, Narisetty, Chaitnaya, additional, Fang, Jian, additional, Huang, Yue-Kai, additional, Salemi, Milad, additional, Rochat, Etienne, additional, Briffod, Fabien, additional, Goy, Alexandre, additional, del Rosario Fernandez-Ruiz, Maria, additional, and Herraez, Miguel Gonzalez, additional

Published
2022
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39. Fatigue Life Prediction of Welded Joint by Microstructure-based Simulation

Author

Shiraiwa Takayuki, Briffod Fabien, and Enoki Manabu

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

This paper proposes a numerical framework to predict fatigue life on welded joints by integrating several computational techniques. The framework consists of five steps: i) materials properties estimation; ii) welding simulation using thermo-mechanical finite element method; iii) macroscopic stress field analysis under cyclic loading; iv) mesoscopic stress field analysis using crystal plasticity finite element method (CPFEM); v) analysis of fatigue crack growth. The total number of cycles to failure is eventually obtained by the sum of initiation life calculated by CPFEM and propagation life calculated by X-FEM. A fatigue life of butt joint is evaluated by the proposed method. The results demonstrated the possibility of evaluating the fatigue life and its scattering by the proposed framework.

Published
2019
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42. Using Global Existing Fiber Networks for Environmental Sensing

Author

Ip, Ezra, Ravet, Fabien, Martins, Hugo F., Huang, Ming-Fang, Okamoto, Tatsuya, Han, Shaobo, Narisetty, Chaitnaya, Fang, Jian, Salemi, Milad, Rochat, Etienne, Briffod, Fabien, Goy, Alexandre, Fernández-Ruiz, María del Rosario, González Herráez, Miguel, Ip, Ezra, Ravet, Fabien, Martins, Hugo F., Huang, Ming-Fang, Okamoto, Tatsuya, Han, Shaobo, Narisetty, Chaitnaya, Fang, Jian, Salemi, Milad, Rochat, Etienne, Briffod, Fabien, Goy, Alexandre, Fernández-Ruiz, María del Rosario, and González Herráez, Miguel

Abstract

We review recent advances in distributed fiber optic sensing (DFOS) and their applications. The scattering mechanisms in glass, which are exploited for reflectometry-based DFOS, are Rayleigh, Brillouin, and Raman scatterings. These are sensitive to either strain and/or temperature, allowing optical fiber cables to monitor their ambient environment in addition to their conventional role as a medium for telecommunications. Recently, DFOS leveraged technologies developed for telecommunications, such as coherent detection, digital signal processing, coding, and spatial/frequency diversity, to achieve improved performance in terms of measurand resolution, reach, spatial resolution, and bandwidth. We review the theory and architecture of commonly used DFOS methods. We provide recent experimental and field trial results where DFOS was used in wide-ranging applications, such as geohazard monitoring, seismic monitoring, traffic monitoring, and infrastructure health monitoring. Events of interest often have unique signatures either in the spatial, temporal, frequency, or wavenumber domains. Based on the temperature and strain raw data obtained from DFOS, downstream postprocessing allows the detection, classification, and localization of events. Combining DFOS with machine learning methods, it is possible to realize complete sensor systems that are compact, low cost, and can operate in harsh environments and difficult-to-access locations, facilitating increased public safety and smarter cities.

Published
2022

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