Fretting wear behaviour of nickel foam struts used in fuel cell applications
13 Apr 2021-pp 135065012110059
TL;DR: In this article, open-cell nickel foams are considered as an alternative for bipolar plates in a proton-exchange membrane fuel cell, where the bipolar plates grab attention because of the high production cost and heavyweight.
Abstract: In any proton-exchange membrane fuel cell, the bipolar plates grab attention because of the high production cost and heavyweight. Hence, the open-cell nickel foams are considered as an alternative ...
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TL;DR: In this paper , the authors demonstrate a simulation of a hybrid energy storage system consisting of a battery and fuel cell in parallel operation, where the novelty in the proposed system is the inclusion of an electrolyser along with a switching algorithm.
Abstract: Currently, transitioning from fossil fuels to renewable sources of energy is needed, considering the impact of climate change on the globe. From this point of view, there is a need for development in several stages such as storage, transmission, and conversion of power. In this paper, we demonstrate a simulation of a hybrid energy storage system consisting of a battery and fuel cell in parallel operation. The novelty in the proposed system is the inclusion of an electrolyser along with a switching algorithm. The electrolyser consumes electricity to intrinsically produce hydrogen and store it in a tank. This implies that the system consumes electricity as input energy as opposed to hydrogen being the input fuel. The hydrogen produced by the electrolyser and stored in the tank is later utilised by the fuel cell to produce electricity to power the load when needed. Energy is, therefore, stored in the form of hydrogen. A battery of lower capacity is coupled with the fuel cell to handle transient loads. A parallel control algorithm is developed to switch on/off the charging and discharging cycle of the fuel cell and battery depending upon the connected load. Electrically equivalent circuits of a polymer electrolyte membrane electrolyser, polymer electrolyte membrane fuel cell, necessary hydrogen, oxygen, water tanks, and switching controller for the parallel operation were modelled with their respective mathematical equations in MATLAB® Simulink®. In this paper, we mainly focus on the modelling and simulation of the proposed system. The results showcase the simulated system’s mentioned advantages and compare its ability to handle loads to a battery-only system.
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TL;DR: In this paper , the material degradation due to fretting in nickel struts contaminate the stack and is investigated using simulated experiments, and a methodology to estimate contamination from simplified single contact is proposed.
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01 Aug 1988TL;DR: The linear elasticity of anisotropic cellular solids is studied in this article. But the authors focus on the design of sandwich panels with foam cores and do not consider the properties of the materials.
Abstract: 1. Introduction 2. The structure of cellular solids 3. Material properties 4. The mechanics of honeycombs 5. The mechanics of foams: basic results 6. The mechanics of foams refinements 7. Thermal, electrical and acoustic properties of foams 8. Energy absorption in cellular materials 9. The design of sandwich panels with foam cores 10. Wood 11. Cancellous bone 12. Cork 13. Sources, suppliers and property data Appendix: the linear-elasticity of anisotropic cellular solids.
8,946 citations
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TL;DR: In this article, three different regimes of fretting are distinguished using dynamic tangential force and displacement measurements and the corresponding modes of surface damage can be identified from post-test metallographic examination.
756 citations
TL;DR: In this paper, the authors reviewed various types of materials, in use and proposed, for bipolar plates and critically examined their physical and chemical properties, including non-porous graphite, coated metallic sheets, polymer composites, etc.
753 citations
TL;DR: The mixed fretting regime (MFR) has been proven to be the most dangerous regime for crack nucleation and service failure as mentioned in this paper, which can be identified from the evolution of the tangential load-displacement loops, i.e. when there is a variation in the shape of the loops.
214 citations
TL;DR: In this paper, the authors reviewed the wear properties of tangential, radial, torsional, and rotational fretting wear modes, e.g. tangential fretting, and showed that the properties of these modes are similar to those obtained from the classic fretting modes.
140 citations