This article presents an in-depth, original, and integrative research narrative examining the dynamic mechanical behavior, viscoelastic performance, and design considerations of natural fiber-reinforced polymer composites (NFRPCs) and their hybrids. Drawing exclusively from the provided references, the study synthesizes empirical findings, theoretical frameworks, and application-driven insights to form a coherent, publication-ready argument about how fiber type, fiber treatment, matrix selection, hybridization strategies, filler incorporation, stacking sequence, and manufacturing techniques govern the dynamic mechanical properties of NFRPCs. The abstract summarizes objectives, methodological approach, principal findings, and implications. Objectives: to consolidate the disparate experimental results in the literature into a systematic conceptual model that links microscale mechanisms with macroscale dynamic mechanical responses, to identify clear design principles for improving storage modulus, loss modulus, and damping behavior, and to situate contemporary hybridization strategies within the broader trajectory of lightweighting and sustainable materials for structural and non-structural applications. Methods: the study conducts a structured synthesis and comparative analysis of results from dynamic mechanical analysis (DMA) studies, thermal analysis, and mechanical characterization of composites reinforced with sisal, jute, linen, hemp, aloe vera, glass, and other natural fibers, and augmented with inorganic fillers such as BaSO4 and SiC or with polymeric foam matrices. Findings: fiber morphology, aspect ratio, interfacial adhesion, fiber treatment, and the viscoelastic nature of the polymer matrix exert dominant control over storage modulus and damping capacity; hybridization with glass or wire mesh can significantly increase stiffness at the expense of some damping, while particulate fillers modify stiffness and thermal stability depending on dispersion and particle–matrix interactions. Significance: synthesizing these studies reveals actionable routes to optimize NFRPC performance for automotive lightweighting, protective coatings, sandwich laminates, and other engineering applications while highlighting gaps in frequency-dependent characterization and long-term viscoelastic stability under realistic service conditions. The article concludes with nuanced recommendations for experimental protocol standardization, multi-scale modeling priorities, and targeted application-driven research that could accelerate industrial deployment.

natural fiber composites, dynamic mechanical analysis, viscoelasticity

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