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| Failure Analysis of Mechanical Trigger Fuze of Medium and Large Caliber Gun-howitzer Based on RifledGun Barrel-Projectile-FuzeCoupling Simulation in Launching Environment |
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| DOI：10.7643/issn.1672-9242.2022.11.001 |
| KeyWord:medium and large calibregun-howitzer mechanical trigger fuze safety and arming device high dynamic launch environment numerical modelof rifled gun barrel-projectile-fuze simulation response characteristics failure |
| Author | Institution |
| TIAN Zhong-wang |
Scienceand Technology on Electromechanical Dynamic Control Laboratory, Xi'an , China |
| NING Bian-fang |
Northwest Institute of Mechanical and Electrical Engineering, Shaanxi Xianyang , China |
| NIU Lan-jie |
Scienceand Technology on Electromechanical Dynamic Control Laboratory, Xi'an , China |
| LI Shi-teng |
Scienceand Technology on Electromechanical Dynamic Control Laboratory, Xi'an , China |
| LIU Jun |
Northwest Institute of Mechanical and Electrical Engineering, Shaanxi Xianyang , China |
| ZHAO Xu |
Scienceand Technology on Electromechanical Dynamic Control Laboratory, Xi'an , China |
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| Abstract: |
| The objective of this paper is to study the response characteristics and failure reasons of mechanical trigger fuze and its typical mechanisms in high dynamic launching environment of medium and large calibregun-howitzer.By establishing the numerical modelofrifled gun barrel-projectile-fuze, the dynamics simulation was carried out under four working conditions, such asprojectilecharge ofNo.0, projectilecharge ofNo.1, loading angle of0.4’and moderatewear degree of gunbarrel, andthe response characteristics of typical parts of fuze under different working conditions were compared.The simulationresults showedthatthe projectile charge and wear degreeof gun barrelweremain factors affecting the load response of typical parts of fuze, and the wear degreeof gun barrelwasmain factor affecting the attitude angle when projectile exiting muzzle.Under condition of moderate wear of gunbarrel, the peak value of radial overload response at fuze splint was2498.4g, which was6.1 times of the initial condition.The peak response of fuze rotating body shaft was4296.1g, which was1.5 times of the initial state.And the pitch angle of projectile whenexiting muzzlewas 0.4°, which was 4.4 times of the initial state.The experimental results showed the simulation error of typical characteristic parameters was less than 5%.Itwas concluded that shaft parts of safety and arming device far away from the projectile shaft wouldbear larger axial overload impact and radial multi-dimensional overload impactduring the launch of projectile, which was more likely to lead to failure of the joint of axle hole with splint.The wear degree of gun barrel would cause the projectilefitted with fuze to bear higher radial overloads in internal ballistic and out of muzzle,andto enter external ballistic with larger attitude angle, which was one of the main factors for increase of flight nutation angle whenmechanical trigger fuze of medium and large caliber gun-howitzerflighting in external ballistic. |
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