OICC Press Journal of Theoretical and Applied Physics 2251-7235 19 2 2025 04 10 Simulation-based analysis of the impact of lattice cavities on tungsten’s mechanical properties 1 6 10.57647/j.jtap.2025.1902.18 EN Mir Mohammadreza Seyedhabashi Atomic Energy Organization of Iran (AEOI)Plasma and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran https://orcid.org/0000-0002-4227-7441 Hadise Eslami Physics Department, University of Isfahan, Isfahan, Iran Mehdi Janbazi Atomic Energy Organization of Iran (AEOI) Physics and Accelerators School, Nuclear Sciences and Technology Research Institute (NSTRI), Karaj, Iran Ehsan Noori Atomic Energy Organization of Iran (AEOI)Plasma and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran Journal Article 2025 04 10 Tungsten, as a plasma-facing material in nuclear fusion reactors like tokamaks, is exposed to extreme conditions, including high heat flux and neutron radiation. These conditions lead to the formation of vacancies and structural defects, significantly influencing its mechanical properties. This study investigates the impact of varying vacancy concentrations on the mechanical behavior of tungsten, focusing on Young’s modulus and tensile strength. Using molecular dynamics simulations implemented in LAMMPS software, different levels of vacancy densities were introduced into tungsten’s lattice structure. The results revealed that an increase in vacancy concentration correlates with a noticeable reduction in both stiffness and tensile strength of the material. These findings underscore the critical role of radiation-induced defects in altering the performance and durability of tungsten, providing valuable insights for its application in fusion reactor designs.