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采用有限元方法对几种不同外形和材料的破片模拟弹垂直侵彻玻璃纤维增强复合材料层合板的动态响应过程进行了模拟分析,研究了靶板有限元模型网格尺度对抗破片侵彻特性模拟计算结果的影响,分析了靶板直径和边界约束条件等因素对复合材料板的抗破片特性的影响。对于厚度为4.0mm以上的较厚靶板,几种常用的13.4g钢质破片模拟弹的外形和材料的差异对侵彻能力影响较小。与已有文献中的实验结果的比较表明:当有限元网格尺度接近复合材料单层厚度时,计算结果的精度较好;当靶板直径大于一个与靶板材料波速相关的临界直径时,靶板直径、边界约束条件对破片模拟弹剩余速度的影响可忽略;完全固支条件的计算结果比简支或自由边界条件更接近于大尺寸靶板的计算结果。
Finite element method was used to simulate the dynamic response of several vertically oriented glass fiber reinforced composite laminates with different shapes and materials of fractured projectiles. The simulation of the mesh scale of the finite element model against the penetration of the fragment was studied. The influence of the calculation results was analyzed. The influence of the target diameter and boundary constraints on the anti-fragment properties of the composite plate was analyzed. For thicker targets with thicknesses above 4.0 mm, the differences in shape and material of several commonly used 13.4 g steel fragment simulators have less effect on penetration. Compared with the existing experimental results, the results show that the accuracy of the calculation results is good when the mesh size of the finite element is close to the thickness of the monolayer of the composite material. When the diameter of the target plate is larger than a critical diameter related to the wave velocity of the target plate, The influence of target diameter and boundary constraint on the remaining velocity of the fragmentistic missiles can be neglected. The calculation results of the complete solidification conditions are closer to the calculation results of large-size targets than the simple support or free boundary conditions.