In modern industrial manufacturing, fluid film journal bearings play a critical role in supporting highspeed rotating equipment subjected to significant rotor loads. This study presents a novel numerical approach for predicting stress distribution in journal bearings using fluid-structure interaction (FSI) simulations conducted with ANSYS Fluent software. Journal bearings, a critical component in rotating machinery, experience complex interactions between the lubricant flow and the structural components, which can lead to significant stress concentrations. The study employs a coupled computational approach combining fluid dynamics and structural mechanics to simulate the behavior of the journal bearing under various operating conditions. The fluid flow is modeled using the NavierStokes equations, while the structural deformation is analyzed through elasticity theory. The FSI method captures the dynamic interplay between the lubricant pressure distribution and the induced stresses in the bearing material. By conducting simulations over a range of different L/D ratios (0.5, 1.0, and 1.5) and eccentricity ratios (0.3, 0.5, 0.7, and 0.9) the study provides valuable insights into stress distribution patterns, particularly at critical locations such as the bearing surface and housing. The results offer a predictive framework for enhancing the design and durability of journal bearings, contributing to improved reliability in engineering applications