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These nanocomposites exploit the exceptional electrical and mechanical properties of carbon nanotubes and graphene nanoplatelets to enable strain\u2010sensitive responses within insulating polymer matrices. Despite their potential, challenges remain for reliable long\u2010term sensing. This review examines the piezoresistive performance of carbon nanotube\u2010 and graphene\u2010reinforced epoxy systems under cyclic and fatigue loading. Sensitivity, often quantified by gauge factors exceeding conventional strain gauges, depends on optimized filler contents near the percolation threshold and electron tunneling conduction. Piezoresistive responses can capture damage evolution via measurable resistance changes during fatigue. However, limitations persist: effects of hysteresis, recovery, synergistic nanofiller interactions, and environmental durability are underexplored, and few studies address performance beyond 10\n                    <jats:sup>4<\/jats:sup>\n                    cycles or under multiaxial loading. Challenges in nanoparticle dispersion, network stability, and the lack of standardized sensing protocols hinder reproducibility and scalability. Future advancements will require hierarchical nanofiller architectures, multimodal sensing integration, and rigorous testing methods. Overcoming these obstacles is crucial to transform piezoresistive nanocomposites from experimental concepts into robust, scalable SHM solutions for next\u2010generation composite structures.\n                  <\/jats:p>","DOI":"10.1002\/adem.202502557","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T21:12:40Z","timestamp":1773004360000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Piezoresistive Monitoring of Carbon Nanomaterial\u2010Reinforced Epoxy Composites Under Cyclic and Fatigue Loading: A Review"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4875-5838","authenticated-orcid":false,"given":"J. 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