The article introduces a micromechanical approach to develop a novel constitutive model for Gas Diffusion Layers (GDLs) under cyclic compressive loads in proton exchange membrane fuel cells (PEMFCs). The performance of PEMFCs is highly dependent on the behavior of the GDL, a critical component that ensures efficient fuel cell operation by facilitating gas distribution, water removal, and electron transport. The article highlights the challenges posed by cyclic compression on the mechanical stability of the GDL and its subsequent impact on fuel cell performance and durability. By proposing a new model that simplifies the analysis of GDL stress-strain behavior, the study aims to enhance the accuracy of predictions and enable more efficient studies of mechanical fatigue and component lifespan in PEMFCs. Understanding the effects of cyclic compression on GDLs is crucial for designing durable and efficient fuel cells, making the development of efficient constitutive models a significant step towards improving PEMFC technology.