Design Of The Lightweight Mortar

The structure design of an 82 mm lightweight mortar is presented in this paper.Firstly,configuration of the mortar barrel,which is constructed by two lightweight materials,is designed.Secondly,a base plate with buffer structure is designed,and the peak of the load,transmitted from interior ballistic force,acting on the base plate can be attenuated by use of the buffer.And that makes basis for the further lightweight design of the mortar.The main contents of this paper are as follows:（1）Design of lightweight cannon: By analysis of the loads and stresses of mortar barrel,a composite structure barrel is projected,which is composed of titanium alloy and aluminum alloy.And that makes the mortar cannon be lighter than one of the similar mortars and the strength of the designed barrel meets the requirements of mortar.（2）Analysis of the characteristics of elastomer buffer.Through the investigation of the characteristics of different buffer,the elastomer buffer was selected for buffering the launching load transmitted to the base plate.The parameters,which affect the performance of the elastomer buffer,were analyzed.（3）Design of base plate with buffering structure: Based on the dynamic analysis,the structural parameters of the buffer were determined,and the structure of the buffer and base plate were designed.Utilizing MATLAB,the recoil movement of mortar was calculated and the structure parameters of buffer were verified.（4）Analysis of the launching dynamics of the mortar firing.In order to investigate the effectiveness of the buffer in the base plate on mortar firing,the dynamic calculation of mortar launch was carried out.Combined with the multi-body system dynamics and finite element theory,ABAQUS was used as a simulation tool to analyze the rigid-flexible coupling dynamics of the designed lightweight mortar.The analysis shows that the launching load transmitted to the base plate is reduced by more than 15%,by using the new base plate with buffer,and the peak of the stress and displacement in base plate are decreased,and mortar weight is reduced by 18% or so.Through the structure design and dynamic analysis of the mortar launching,it is proved that the buffering structure design in mortar base plate can provide an effective approach for attenuating launching load and reducing the weight of mortar.