Study on penetration protection properties of continuous fiber-reinforced high-porosity composites
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摘要: 开展连续纤维增强高孔隙复合材料的侵彻防护性能研究具有重要的科学意义和应用价值。首先用二级轻气炮发射Q235钢质弹丸,对连续纤维增强高孔隙复合材料开展弹道侵彻实验,计算了弹道极限,归纳和分析了其损伤形态和模式,并且将这种复合材料的侵彻防护性能和其他材料进行比较。然后对弹道侵彻连续纤维增强高孔隙复合材料进行了数值仿真,通过比较剩余速度和损伤形态与范围,结果表明仿真结果与实验吻合较好,进而通过观察有限元仿真的弹孔形态、应力分布和损伤分布等方式对侵彻过程的损伤机理进行了分析。研究结果为这类复合材料在侵彻防护领域的应用提供了参考依据。
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关键词:
Abstract: It is of great scientific significance and application value to study the penetration protection performance of continuous fiber-reinforced high-porosity composites. First, the ballistic penetration experiments of 20 mm thick continuous fiber-reinforced high-porosity composites were carried out by using two-stage light gas gun firing Q235 steel projectiles with a diameter of 4.5mm. Based on the analysis of the initial and final velocity of bullet penetration, the ballistic limit of the material is obtained. By observing the damage patterns of the target plate, these patterns were divided into three types from low to high according to the initial velocity of the projectiles: back-crack type, back-burst type and penetrated type. The penetration protection performance of this composite material was compared with other materials by specific energy absorption, showing that the protection performance of the composite against low-speed penetration of 600m/s or below is better than that of steel, aluminum, Kevlar and glass fiber composite. Then, an orthogonal anisotropic continuum damage constitutive model was proposed for the continuous fiber-reinforced high-porosity composites. The constitutive model was written as a subroutine and embedded in the finite element software by secondary development. On this basis, the finite element simulations of ballistic penetrations of continuous fiber reinforced high-porosity composites were carried out. The validity of the constitutive and finite element models is verified by comparing the final velocity, ballistic limit and damage range of the back surface obtained from experiment and simulation. Furthermore, the damage mechanism of the penetration process was analyzed by observing the shape of the bullet hole, stress distribution and damage distribution of the finite element simulation. The results showed that the formation of the bullet hole during the penetration process of spherical projectile is caused by shear damage, the debonding of fiber and matrix was caused by the combined action of compression and shear, the delamination damage of the target plate is caused by the tension wave formed by the reflection of compression wave, and the fiber breakage belongs to tension damage. Besides that, the kinetic energy, internal energy and their proportion to the kinetic energy change of the bullet were compared with the initial velocities. It is pointed out that the kinetic energy of the projectile will be more transformed into the kinetic energy of the fragment of target plates and the plastic deformation energy of the projectile. The research results provide a reference for the multifunctional integration of these composite materials in heat protection, penetration protection and load bearing.
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