基于轴对称光滑有限元的身管动力学仿真OA

To address the issue of large-scale numerical simulation in artillery barrel analysis,a two-dimensional axisymmetric strain-smoothed element was developed based on the gradient-smoothed finite element method.This approach performs strain smoothing operations at the edge centroids of triangular finite elements and subsequently constructs a linearly varying strain field within the element by interpolating the smoothed strains from these edge centroids.Compared with conventional linear finite elements,this method effectively mitigates strain discontinuity across elements,thereby improving computational accuracy.Utilizing this method,an axisymmetric finite element model of the barrel was established,and structural dynamic simulations were conducted considering the spatiotemporal variations in propellant gas loading.The results demonstrate that during the interior ballistic process,the maximum deformation and stress occur at the forcing cone of barrel,where radial deformation dominates.However,the axial spatial distribution variation of the load induces non-negligible axial deformation,which cannot be captured by thick-walled cylinder theory.The method in this paper improves triangular elements in modal analysis by introducing strain smoothing stabilization techniques.While maintaining the convenience of mesh generation,it achieves computational accuracy close to that of the traditional hexahedral element method.This study provides more comprehensive theoretical support for the design of artillery barrel.