| Muzzle brake is an important part of the tube which was mainly used for decreasing the recoil energy of artillery. But the muzzle brake not only has loads on the tube but also affects the muzzle disturbance. In this work, the materials of titanium alloy and gun steel were used to design a muzzle brake with composite structure. In this way, the weight of muzzle brake was reduced. In addition, the strength analysis of muzzle brake under action of transient dynamic load and temperature field provided theoretic verification for feasibility of muzzle brake with composite structure.Firstly, the 3D model of impact-reaction-type muzzle brake was builded by Creo software and the muzzle flow field was meshed by ICEM software.In addition, the muzzle flow field was calculated via Fluent software. Consequently, the pressure field and temperature field of muzzle flow field were obtained by these softwares. The results demonstrated that the efficiency of muzzle brake was 41.6%, which was 0.6% higher than theoretical value. Therefore, the simulation results were within the range of allowable error.Secondly, the transient dynamic load of the muzzle flow field was obtained. Moreover, based on Ansys Workbench software, the strength analysis of muzzle brake with gun steel and composite structure was operated via fluid solid coupling method. The results showed that the largest stress was distributed at the front baffle of muzzle brake and the deformation was appeared at the front of muzzle brake. Further, the muzzle brake with composite structure was designed with materials of titanium alloy and gun steel, and its weight was just 0.75 times of muzzle brake made by gun steel material.Thirdly, the temperature field of muzzle flow field was obtained. Moreover, based on Ansys Workbench software, the thermal analysis of muzzle brake with gun steel and composite structure was operated via fluid solid coupling method. The results indicated that the temperature on the surface of cavity and side pore of two kinds of muzzle brake was all over 1000 ℃. Based on temperature field of muzzle brake, the thermal stress of two kinds of muzzle brake were calculated. As a consequence, the thermal stress was obviously larger than the yield limit of materials. Further, the area with larger thermal stress was appeared on the contact surface of muzzle brake with composite structure. However, the thermal stress was lower than yield limit of materials.Finally, strength analysis with applying transient dynamic load and transient temperature to two kinds of muzzle brake via fluid solid coupling. As a consequence, the stress and deformation under the action of transient dynamic load and temperature field was obtained. The simulations demonstrated that the distribution of stress and deformation was similar with analysis results of thermal stress. In addition, the results showed that the muzzle brake can bear the strength under action of transient dynamic load and temperature field.
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