Optimum Design Of The Sheet Structure Of A Large-caliber Mortar Mount

The base plate withstands recoil resistance directly when a mortar launches,and it usually occupies a large proportion of the overall weight.It is of great significance to optimize the structure of the mortar base plate and reduce its weight under certain design requirements.This study was supported by the National Pre-research Project.A method combining ply design of carbon fiber reinforced composites and structural optimization design was used for lightweight design and simulation analysis of the base plate.The main contents of this paper are as follows:A nonlinear dynamic finite element model of mortar-soil coupling was established.The stress and displacement responses of the titanium alloy base plate under four working conditions of different elevation angle and direction angle were obtained.Topology optimization of the mortar base plate was conducted.The force transmission path of the base plate was obtained.The shape optimization and size optimization of a titanium alloy base plate was conducted.Through the shape optimization of the inside metal plates and the size optimization of all the metal plates,the titanium alloy base plate with a 22.57%weight loss was obtained.The lightweight base plate was designed incorporating both titanium alloy skeleton and composite laminates.The titanium alloy skeleton was designed based on the force transmission path of the base plate.A composite base plate was established through the carbon fiber reinforced composite ply design.With the size optimization of composite laminates and titanium alloy plates,the composite base plate with a weight loss of 39.49%was obtained.The dynamic finite element numerical results show that those two optimized mortar base plates meet the strength requirements.The firing stability and muzzle disturbance are close to or even slightly superior to the ones before optimization.This study concerning structure optimization design and the use of carbon fiber reinforced composites is beneficial for lightweight design of mortars..