This study presents a micromechanical modeling approach to analyze the mechanical behavior of hemp/clay composites. The composite consists of hemp fibers embedded in a clay matrix, chosen for its environmental benefits and natural properties. The research employs localization and homogenization methods along with a three-phase model to provide a detailed analysis of the composite's behavior. The findings show a strong correlation with empirical data, demonstrating the model's effectiveness in capturing the composite's mechanical response. The study highlights the significance of hemp fibers as a natural, renewable material with high tensile strength and resistance to alkaline conditions. The hemp/clay composite is recognized as a sustainable, eco-friendly material. The composite's properties are crucial for its effective application, as it is a hierarchical material with micro-scale and macro-scale structures. The micro-scale focuses on particle arrangement within the matrix, while the macro-scale addresses the overall structural response in engineering applications. The study uses a representative volume element (RVE) to analyze the composite, applying displacement and traction continuity conditions at the interfaces. Various micromechanics theories, including the Voigt and Reuss models, are discussed. The Hashin-Shtrikman model provides theoretical bounds for composite properties, considering the stiffness and Poisson's ratios of the constituent phases. The study also examines the composite's durability and how external environmental factors affect its performance. It shows that hemp fiber reinforcement significantly enhances the composite's resistance to physical and chemical degradation, extending its lifespan. Factors such as moisture, temperature, and UV exposure are evaluated to understand their effects on the composite's integrity. The composite maintains structural integrity across a wide temperature range and is resistant to UV-induced degradation when the surface of hemp fibers is treated. The study develops a three-phase model for the composite, incorporating cylindrical hemp inclusions and a cylindrical clay matrix layer within an equivalent homogeneous medium. The model assumes linear, elastic, and isotropic components with perfect bonding between the fiber and matrix. The effective elastic properties of the composite are calculated using the strain concentration tensors and the Eshelby tensor. The results show that the effective shear modulus of the composite increases with the volume fraction of hemp fibers, aligning with the expected reinforcing effect. However, the effective Young's modulus shows a downward trend with increasing fiber volume fraction, indicating that factors beyond individual component stiffness influence the composite's overall stiffness. The study concludes that the developed model accurately predicts the composite's mechanical behavior, making it suitable for estimating the elastic modulus of fiber-reinforced composites.This study presents a micromechanical modeling approach to analyze the mechanical behavior of hemp/clay composites. The composite consists of hemp fibers embedded in a clay matrix, chosen for its environmental benefits and natural properties. The research employs localization and homogenization methods along with a three-phase model to provide a detailed analysis of the composite's behavior. The findings show a strong correlation with empirical data, demonstrating the model's effectiveness in capturing the composite's mechanical response. The study highlights the significance of hemp fibers as a natural, renewable material with high tensile strength and resistance to alkaline conditions. The hemp/clay composite is recognized as a sustainable, eco-friendly material. The composite's properties are crucial for its effective application, as it is a hierarchical material with micro-scale and macro-scale structures. The micro-scale focuses on particle arrangement within the matrix, while the macro-scale addresses the overall structural response in engineering applications. The study uses a representative volume element (RVE) to analyze the composite, applying displacement and traction continuity conditions at the interfaces. Various micromechanics theories, including the Voigt and Reuss models, are discussed. The Hashin-Shtrikman model provides theoretical bounds for composite properties, considering the stiffness and Poisson's ratios of the constituent phases. The study also examines the composite's durability and how external environmental factors affect its performance. It shows that hemp fiber reinforcement significantly enhances the composite's resistance to physical and chemical degradation, extending its lifespan. Factors such as moisture, temperature, and UV exposure are evaluated to understand their effects on the composite's integrity. The composite maintains structural integrity across a wide temperature range and is resistant to UV-induced degradation when the surface of hemp fibers is treated. The study develops a three-phase model for the composite, incorporating cylindrical hemp inclusions and a cylindrical clay matrix layer within an equivalent homogeneous medium. The model assumes linear, elastic, and isotropic components with perfect bonding between the fiber and matrix. The effective elastic properties of the composite are calculated using the strain concentration tensors and the Eshelby tensor. The results show that the effective shear modulus of the composite increases with the volume fraction of hemp fibers, aligning with the expected reinforcing effect. However, the effective Young's modulus shows a downward trend with increasing fiber volume fraction, indicating that factors beyond individual component stiffness influence the composite's overall stiffness. The study concludes that the developed model accurately predicts the composite's mechanical behavior, making it suitable for estimating the elastic modulus of fiber-reinforced composites.