高速冲击下弹丸侵彻角对碳/玄武岩纤维金属层合板动态力学行为研究

Effect of projectile penetration angle on dynamic mechanical behavior of carbon/basalt fiber metal laminates under high-velocity impact

  • 摘要: 纤维金属层压板(Fiber metal laminates,FMLs)凭借其固有的优异抗冲击性能与显著的抗疲劳性能,展现出广阔的应用前景,近年来逐渐成为弹道冲击领域的研究热点。基于弹道冲击有限元分析,研究了钛基碳/玄武岩纤维增强聚合物基复合材料(Carbon/Basalt fiber-reinforced polymer,CFRP/BFRP)层合板的破坏模式与能量吸收特性,并分析了不同弹丸侵彻角条件下层压板厚度及弹丸形状的影响。结果表明,随着入射角的增加,弹丸的损伤状态由回弹转变为穿透,弹道极限速度相应提高。当入射角为0°和15°时,FMLs所吸收的能量、能量吸收率(Energy absorption rate,EAR)及比吸能(Specific energy absorption,SEA)随撞击速度的变化较小;而入射角为30°和45°时,则呈现相反的变化趋势。以圆柱形、半球形、圆锥形及椭圆形弹丸为例,斜向穿透可提高FMLs的能量吸收能力。当入射角由0°增加至45°时,相较于2.6 mm厚度的层压板,6.6 mm厚度层压板内的应力分布发生显著变化,弹孔面积增大,弹孔形态由开放角度形转变为花苞包裹形。本研究为FMLs的相关设计与开发提供了理论依据与技术参考。

     

    Abstract: Fiber metal laminates (FMLs) exhibit considerable application potential due to their inherent superior impact and fatigue resistance, and have recently emerged as a prominent research focus in the field of ballistic impact. Based on finite element analysis of ballistic impact events, this study investigates the failure modes and energy absorption characteristics of carbon/basalt fiber-reinforced polymer (CFRP/BFRP) metal laminates incorporating titanium alloy layers. The influence of projectile incidence angle, laminate thickness, and projectile nose shape is systematically analyzed. The results indicate that as the incidence angle increases, the projectile's interaction with the target transitions from rebound to full penetration, accompanied by a corresponding increase in the ballistic limit velocity. At incidence angles of 0° and 15°, the absorbed energy, energy absorption rate (EAR), and specific energy absorption (SEA) of the FMLs exhibit only slight variations with increasing impact velocity. Conversely, significant variations are observed at incidence angles of 30° and 45°. For cylindrical, hemispherical, conical, and elliptical projectiles, oblique penetration enhances the overall energy absorption capacity of the FMLs. Furthermore, when the incidence angle increases from 0° to 45°, the 6.6 mm-thick laminate exhibits a marked change in internal stress distribution, along with an enlarged perforation area compared to the 2.6 mm-thick laminate. The perforation morphology transitions from an open angular shape to a petal-like wrapped configuration. This study provides a theoretical basis and technical reference for the optimal design and engineering application of fiber metal laminates.

     

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