Dynamic Response of High-Speed Projectiles Penetrating into Concrete Target by Asymmetric Load
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摘要: 将混凝土侧壁对弹道的稳定作用简化为与所受横向力相关的分布载荷，运用自由梁理论分析压弯联合作用下弹体的屈服响应, 讨论影响横向非对称作用的主要因素。在弹体侵彻过程中，非对称质量侵蚀越严重，骨料与砂浆基质提供的静阻力差异越大，弹头越尖削，受到弯曲作用越明显。基于理想刚塑性模型，将弹体受横向冲击载荷的工况简化为轴向无约束悬臂梁的动态响应，对塑性铰的移行及“J”形弹道的形成机理进行了分析。Abstract: In this work the constraint function of concrete was regarded as the distribution load associated with the transverse load, and the yield response of projectiles under the compressive and bending load was studied using the free-free beam theory, with the main parameters of the impact of the asymmetric transverse load examined.It was found that the projectiles can be easily bent as a result of greater asymmetric mass loss, greater difference in static resistance between the grout and the aggregate, and sharper projectiles, and projectiles subjected to the transverse impact load can be considered as the response of the cantilever beam without an axial constraint.In addition, the diabasis of the plastic hinge and the formation process of the J-shaped trajectory was analysed.
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Key words:
- mechanics of explosion /
- bending yield /
- travelling plastic hinge /
- asymmetric /
- penetration concrete target /
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图 3 非对称质量磨蚀下无量纲轴向应力、弯曲应力和屈服函数沿弹长分布
Figure 3. Dimensionless axial stress, bending stress and yielding function distribution along the projectile axis in different cases of asymmetrical nose erosion
图 5 靶材非对称作用下屈服函数沿弹长分布
Figure 5. Dimensionless axial yielding function distribution along projectile axis in different cases of asymmetrical effect
图 6 非对称质量磨蚀下无量纲轴向应力、弯曲应力和屈服函数沿弹长分布
Figure 6. Dimensionless axial stress, bending stress and yielding function distribution along the projectile axis in different cases of initial nose shape parameters
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