The gun barrel temperature field formed by the thermal shock of the gunpowder gas with high temperature and high pressure on the barrel of a new type of medium-caliber cased telescoped ammunition machine gun during firing is simulated and analyzed. It is found that a sealing structure designed on the machine gun has good sealing performance, so the temperature field of this new machine gun barrel can be analyzed and calculated by the conventional finite element method. The finite element model of the gun barrel is established by Ansys software, and the heat transfer process of the gun barrel is simulated based on the theory of nonlinear transient thermodynamics, to obtain the distribution law of the temperature field of the gun barrel under different firing modes in the three calculated cross sections, which will provide the related theoretical basis for the prediction of the life of the gun barrel of this new type of machine gun as well as for its optimization design.
Isogeometric analysis is a new numerical method that has been developed in recent years based on the finite element method. The method avoids the geometric errors of the finite element method by unifying the models used for modeling and analysis, and has a Cn continuous nature. This paper studies the representation method of the nonuniform rational basis spline (NURBS) geometry used in isogeometric analysis; the stiffness matrix is derived according to basic finite element theory, boundary and constraint conditions are imposed, and the static analysis results are finally obtained by solving the linear equations. We use a two-dimensional plate with holes as an example to establish a model to enable comparison of the calculation results obtained from isogeometric analysis and finite element analysis from the perspectives of both calculation accuracy and calculation efficiency. The numerical example results show that, when compared with traditional finite element analysis, the isogeometric analysis method based on NURBS shows obvious advantages in both performing calculations and obtaining a solution. Isogeometric analysis can obtain accurate solutions with fewer system degrees of freedom and offers good flexibility and practicability.
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