This project belongs to the discipline of aircraft structural mechanics in the aerospace field. Damage and propagation analysis of aircraft structures has always been a hot topic in aerospace structure research, including the analysis and judgment of damage origin, the analysis and simulation of damage propagation paths, and the analysis of failure modes and failure mechanisms. Existing numerical calculation techniques, represented by finite elements, have a strong ability in traditional strain-stress analysis, but their ability to analyze material failure and failure lags far behind because their governing equations require that the displacement field must be continuous and differentiable. But in damage and failure problems, the spatial partial derivative does not exist at the crack tip or along the crack surface. Therefore, once a crack appears in the material, the basic mathematical structure of the equations fails. As an emerging mechanical theory, near-field dynamics (PD) describes the mechanical behavior of matter based on the idea of non-local action and integral equations. It breaks through the limitations of traditional methods in solving discontinuous problems and can simulate the ldquo; naturally occurring rdquo; and ldquo; freely extending rdquo;. Especially for discontinuous problems such as fracture, dynamic crack growth, damage, fatigue, impact, and cyclic plasticity, the theoretical framework of near field dynamics can obtain more profound and rich results. In view of the advantages of PD methods in numerical simulation of discontinuity problems, especially composite damage, the U.S. Department of Defense, the U.S. Natural Science Foundation (NSF), the U.S. Air Force Research Laboratory (AFRL), the Air Force Scientific Research Bureau, the Office of Naval Research, and the European Union and Boeing have all provided substantial funding for PD research. Aiming at composite laminated plates and aluminum alloy thin-walled structures in aerospace structures, this project studies structural damage, crack growth, impact, stability and nonlinear problems on the basis of further improving the relevant theories of near-field dynamics. The main contributions are: 1) A near-field dynamic model and damage analysis method for fiber reinforced composite laminates have been established, which can carry out damage propagation analysis of fiber rupture, matrix rupture and delamination failure forms in various laminated composites. An impact dynamic model of composite laminates based on near field dynamics was established. An isotropic brittle material modeling method based on near-field theory for microscopic elastic-brittle material models is proposed. Combined with GPU algorithm, the calculation speed can be effectively improved. 2) A modal near-field dynamics method was created to simulate the physical nonlinear behavior of composite materials. The method introduces a classical single-parameter nonlinear constitutive model to determine the relationship between the force vector state and the deformation vector state in the near-field dynamic model of composite materials. A scalar function containing damage parameters is introduced into the force vector state expression to realize damage description. A compensation mdash; correction method for non-local strain in modal near-field dynamics is proposed to reduce the influence of boundary effects in modal near-field dynamics. 3) A PD model discretization method and a PD method for stability analysis of thin-walled metal plate and shell structures are proposed to improve the calculation efficiency of the PD thin plate model. The expression relationship between the node stiffness matrix and the structure stiffness matrix is derived. Kilic's dynamic relaxation method based on PD bond theory is improved. A new modified iterative convergence criterion is proposed, and corresponding computer software is developed. This project started in 2011. In 2013, the first domestic article on near-field dynamic damage analysis of composite laminated plates and the first related software copyright were published in the Journal of Mechanics; in 2014, it obtained the first domestic near-field dynamic method patent. There are 4 invention patents and 4 software copyrights, and they have won 1 Outstanding Master's Thesis Award from Shanghai City and 1 Research Romai Science and Technology Aerospace Scholarship (Science and Technology Innovation Practice) from Shanghai Jiao Tong University. He published 7 SCI papers and was cited 64 times, and published 16 EI and domestic and foreign conference papers and was cited 51 times. The technology of this project has been successfully applied to the development of domestic large aircraft and the research of major special projects of civil aircraft.