Effect of interfacial contact properties on the structural dynamics of PEMFC based on fractal theory and virtual material
Source abstract
Abstract
The vibration from the road inevitably causes the microscopic dynamic contact of the contact interface inside the proton exchange membrane fuel cell (PEMFC), and the dynamic characteristics of the contact interface have an obvious influence on the dynamic behavior of the whole stack. In this paper, the normal and tangential contact between bipolar plate (BP) and membrane electrode assembly (MEA) is investigated by fractal theory, and the variation of contact stiffness with fractal dimension, characteristic length and loading force is studied comprehensively. Then, through the virtual material method, a dynamic model of the fuel cell stack reflecting the contact characteristics is established. It is found that the natural frequencies of the stacks considering the contact stiffness are lower than those not considering it. The larger the contact stiffness corresponding to the fractal dimension and characteristic length, the higher the natural frequency of the stack, and the effect of fractal parameters on the surface roughness is explored. Increasing the total clamping force can increase the stack global modal frequency, but it will decrease the cell local modal frequency.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fuel Cells and Related Materials · Adhesion, Friction, and Surface Interactions · Advanced Sensor and Energy Harvesting Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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