<p>Elucidating the microscale tensile damage and fracture mechanisms of polycrystalline sintered nano‑silver is critical for enhancing its service reliability. In this work, a novel molecular dynamics (MD) model of polycrystalline sintered nano‑silver was developed by integrating the phase field method and Voronoi tessellation. The model reliably captures the full damage evolution of sintered nano‑silver under tensile loading, and its validity was verified via comparative analysis with experimental tensile fracture surface characterizations. Through a combination of molecular dynamics simulations and tensile experiments, the full tensile fracture process and underlying damage mechanisms of polycrystalline sintered nano-silver are systematically revealed. The results demonstrate that the polycrystalline microstructure exerts a pronounced effect on the mechanical properties of sintered nano‑silver, and this effect becomes increasingly significant with decreasing porosity. The tensile fracture process proceeds through three sequential stages: yielding and incipient necking of sintered necks, fracture of small‑neck‑width necks and formation of continuous fracture layers, and shear‑slip fracture of large‑neck‑width structures resulting in global structural failure. Furthermore, the origin of the abundant shear-slip fracture striations observed on experimental fracture surfaces is elucidated, which are attributed to the fracture of coarse sintered structures in the final deformation stage. These findings provide critical insights into the reliability assessment of sintered nano‑silver and offer a valuable modeling framework for its damage prediction and performance optimization.</p>