Comparison of Impact Damage between Ceramic Structure and Nacre-Like Ceramic/Polyurea Composite Structure
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摘要: 建立了陶瓷梁受平头弹撞击的有限元模型，模拟了其冲击损伤演化过程，模拟结果与实验结果吻合较好，验证了模型的合理性。在此基础上，建立了仿珍珠母陶瓷/聚脲复合梁受相同弹体撞击的有限元模型，将其损伤演化过程与陶瓷梁进行了对比，并且分析了弹体撞击速度对两者损伤过程的影响。结果表明：在高速撞击下，陶瓷梁的损伤呈锥状扩展，梁发生整体性破坏，而仿珍珠母复合梁的损伤沿纵向（冲击方向）呈圆柱状扩展，梁发生局部性破坏，能更好地保持结构完整性；随着弹体撞击速度的增加，陶瓷梁的损伤范围加大，损伤程度加剧，而仿珍珠母复合梁的损伤范围在撞击速度高于一定值后变化不大，仅损伤程度增加。Abstract: The finite element model of a ceramic beam impacted by a blunt-nosed projectile was established, and the impact damage evolution process of the beam was simulated. The simulation results are in good agreement with experimental results, which confirms the validity of the model. On this basis, the finite element model of a nacre-like ceramic/polyurea composite beam impact by the same projectile was established. Its damage evolution process was compared with that of the ceramic beam. Effects of impact velocity of projectile on damage process are studies for the two beams. The obtained results show that the damage of the ceramic beam expands conically, and the beam undergoes global damage. The damage of the nacre-like composite beam expands in a cylindrical shape in the longitudinal direction (i.e., impact direction), and the beam undergoes local damage, which gives a good ability to maintain structural integrity. Moreover, as the impact velocity of the projectile increases, the range and extent of damage of the ceramic beam increases significantly. Differently, when the impact velocity exceeds a certain value, the damage range of the nacre-like composite beam changes insignificantly, while its damage extent grows with the increase of impact velocity.
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Key words:
- impact /
- ceramic /
- nacre-like /
- polyurea /
- damage evolution
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图 3 30
${\text{μ}}{\rm{s}}$ 时梁的损伤云图Figure 3. Damage contours of beams at 30
${\text{μ}}{\rm{s}}$ 
图 4 梁背面中心点的z向正应力(σz)的时程曲线
Figure 4. History curves of normal stress in z-direction (σz) for center point on back face of beams
ρ/(kg·m–3) A/MPa B/MPa n C 7 830 792 510 0.26 0.014 
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