Analysis Of Fatigue Characteristics Of A Certain Type Of Impact-resistant Porter Car Body And Research On Lightweight Technology

Artillery,the god of war,plays an irreplaceable role on the battlefield,but even today,with its advanced technology,it is still difficult to achieve more comprehensive performance in terms of protection,mobility and firepower sustainability.Against this background,the combination of SUV and artillery to form a car howitzer has become a very pragmatic choice as far as possible to improve combat mobility and reduce the physical energy consumption of soldiers as long as the firepower needs are met.Howitzer has gained widespread interest since its inception,but it can produce high temperature and pressure during launch,potentially damaging the cab and threatening the safety of in-car occupants.A key issue in the development of vehicle-mounted guns is how to combine the car with the gun.In this paper,with a howitzer as the research object,the overpressure formed by the muzzle shock wave on the cab surface is calculated by numerical simulation of the flow field.Combined with the transient dynamics Theoretical knowledge,the simulation calculates the cab in the muzzle shock wave under the action of the structural response.The fatigue characteristics of the cab were analyzed based on fatigue durability technology,and the cab was then designed with light weight on the basis of fatigue resistance.Firstly,the flow field model near cab and gun is established.The flow field of muzzle shock wave is simulated and calculated,and the pressure distribution on the cab surface is obtained.The cab overpressure was verified through experiments.Subsequently,based on the flow field calculation,the average overpressure load of the monitoring surface was extracted.The transient dynamic analysis of the cab structure was carried out and result of the analysis was used as input to calculate the cab fatigue characteristic.Finally,the cab roof and rear wall lightweight design and the fatigue test of the optimized cab was carried out to ensure that the cab structure after light weight will not cause fatigue damage during the circulation of the muzzle shock wave.The research results of this paper have strong reference significance for the design and optimization of the cab structure.