Study on collision of threaded connection during impact

• Published in: International journal of impact engineering 2017-08, Vol.106, p.133-145
• Main Authors: Dongmei, Zhang, Shiqiao, Gao, Shaohua, Niu, Haipeng, Liu
• Format: Article
• Language: English
• Subjects: Collision dynamics; Collision force; Collision model; Collision time; Collisions; Deceleration; Elastic model; Elastic scattering; Finite element analysis; Finite element method; Load distribution (forces); Mathematical analysis; Mathematical models; Projectiles; Stiffness; Stress concentration; Tensile strength; Tensile tests; Threaded connection; Vibration analysis; Vibration measurement; Wavelet analysis
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2017.03.012

•Elastic model for the threaded connection were established. According to elastic deflection of thread, the axial load distribution of thread was determined and the stiffness of threaded connection was calculated.•Collision model for threaded connection was proposed, and the calculation methods of collision time and collision force were given.•Tensile tests of threaded connections and impact experiments of projectiles penetrating into concrete targets were conducted.•Finite element analysis was performed to study the collision process on the interface of threaded connection between projectile and fuze.•The wavelet analysis for measured deceleration and the vibration frequency analysis for projectile and fuze were conducted. For the threaded connection, elastic model and collision model were established. According to elastic deflection of thread, the axial load distribution of thread was determined and the stiffness of threaded connection was calculated. Meanwhile, collision model for threaded connection was proposed, and the calculation methods of collision time and collision force were given. Through tensile tests of threaded connections and impact experiments of projectiles penetrating into concrete targets, thread stiffness and deceleration data were obtained respectively. At the same time, finite element model were created to study the collision process on the interface of threaded connection between projectile and fuze. In order to obtain the time-frequency characteristic of deceleration, the wavelet analysis for measured deceleration and the vibration frequency analysis for projectile and fuze were conducted. The good agreement among the calculation value, finite element analysis and experiment data proved that the thread collision between projectile and fuze really exist and have very serious influence for the measured deceleration.