0000000000026859
AUTHOR
Yann Meyer
Impact of cyclic mechanical stress on the electrical contact resistance between gas diffusion layer and bipolar plates in Polymer Electrolyte Membrane Fuel Cells
WHEC 2018, 22nd edition of the WORLD HYDROGEN ENERGY CONFERENCE, Rio de Janeiro, BRESIL, 17-/06/2018 - 22/06/2018; and collisions) and the mechanical clamping stress applied during the stack assembly. The internal stresses come from the shrinking and the swelling of the membrane caused by water content and the difference between the thermal expansion coefficients of the cell components. These mechanical stresses have an impact on the global fuel cell's performance and one of the most sensitive cell's components to this pressure is the Gas Diffusion Layer (GDL). This layer, assembled with the membrane electrode assembly, provides the reactant gases, evacuates the produced heat and …
A new method for Poisson’s ratio measurement with time-of-flight technique: application to the preliminary design of smart composite structures
International audience; Smart composite structures, which are able to modify their mechanical properties with respect to their environment (e.g. active vibration control), to interact with other structures (e.g. mechatronic) or with human beings (e.g. Human-Machine Interaction), are widely used in the modern industrial fields (e.g. aerospace), due to the intensification of the operational dynamic environment and an increase of durability requirements from the customers. Conventionally, the piezoelectric transducers are glued on the surface of the structure and the power and control electronics are away. To protect the transducer elements and their connections and develop some industrially p…
Comparative study by design of experiments of linear and nonlinear constitutive models and geometric parameters effects on PEMFC performances
International audience; Proton Exchange Membrane Fuel Cell (PEMFC) appears to be a promising technology to take up the challenges of energy transition, therefore it appears necessary to optimize the systems to use the right amount of raw materials. In our study, we have addressed the mechanical aspects and their impacts on performance of it. More specifically, the main objective of the proposed work is to understand the influence of fuel cell core design and mechanical properties on electrical resistances of internal system contacts. Indeed, electrical contact resistances are one of the important sources of losses and therefore require special attention. To achieve this, a Design of Experim…
Structural health monitoring of a smart composite structure with a Time-of-Flight method
International audience; Smart composite structures with a fully distributed set of integrated piezoelectric transducers are used to demonstrate the feasibility of embedded Structural health monitoring (SHM). Indeed, the piezo ceramics elements have been directly integrated into the heart of the composite during the manufacturing process. Then, a Time-of-Flight method has been applied. This technique is based on the duration measurements of a wave propagation with a simple and low cost experimental setup. Integrated piezoelectric transducers are used for monitoring the behavior of the structure. In this research, special plates (with a piezo ceramics disk on each corner), made of glass fibre…
Complex composite structures with integrated piezoelectric transducers
International audience; Nowadays, in different industrial fields as transport or aerospace, a research effort is conducted to reduce the structural weight. One of the most promising solutions is the use of composite structures due to their high stiffness, their low mass density and their low damping factor. At the same time, there is an intensification of the operational dynamic environment and an increase of durability requirements. These different expectations seem to be contradictory. One solution to manage these points is to design and manufacture smart composite structures with a fully distributed set of integrated piezoelec-tric transducers. These structures are able to modify their m…
THERMOMECHANICAL BEHAVIOR OF SMART COMPOSITE STRUCTURE (GLASS FIBER REINFORCED POLYESTER RESIN)
International audience
SmaRt Composite StructurE (Project SyRaCuSE) Towards mastering challenges concerning the product lifecycle
International audience; Since the middle of the 80’s, smart composite structures are announced as being able to revolutionize the industrial world and become a main engine of economic growth. A smart composite structure is a structure combining distributed actuator and sensor networks embedded at the heart of the matter and a command and control unit. The idea is to mimic nature in order to produce industrial composite structures that will adapt their functionality to their environment in a predicted manner. This approach seems attractive with a lot of potential applications: Vibration suppression, non-Destructive Evaluation, Energy Harvesting, Internet of Things... In a way, the smart comp…
A new scoring strategy for Meta-heuristic, Single-Objective, Continuous Optimization Algorithm Benchmark
International audience
Characterization process to measure the electrical contact resistance of Gas Diffusion Layers under mechanical static compressive loads
AEM2016. International conference on Advanced Energy Materials, University of Surrey, Guildford, ROYAUME-UNI, 12-/09/2016 - 14/09/2016; Recent research has identified the mechanical properties of the fuel cell internal components (in particular, the Gas Diffusion Layers - GDLs) as key-parameters to obtain high final performances of the generator. The mechanical compression modulus of these components, the stability of their mechanical properties with respect to temperature and humidity, and their ability to interact with water have an impact on the electrical contact resistances in the stack and, by consequence, on the overall performance of the electric generator. Reducing the losses by co…
A new loading problem: product size reduction
International audience