Dynamic response and failure mode of PVC sandwich plates subjected to impact loading
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摘要: 通过开展对泡沫金属子弹撞击加载聚氯乙烯(polyvinyl chloride, PVC)夹芯板的实验，结合三维数字图像相关性(three dimensional digital image correlation, DIC-3D)技术，研究固支夹芯板在撞击加载条件下的动态响应，获得夹芯板受撞击及响应的变形过程，并结合图像分别分析夹芯板整体及三层结构的变形和失效模式；研究子弹冲量与背板最终变形之间的关系和相似冲量下等面密度不同芯层密度的夹芯结构的抗撞击性能。结果表明：夹芯板的破坏和失效主要集中在泡沫金属子弹直接作用区域，背板挠度由中间向固定端逐渐减小，子弹冲量与背板变形近似成线性关系。在等质量的条件下，降低芯层密度、增加芯层厚度可以有效降低背板的变形，实验结果对聚合物夹芯结构的工程优化设计具有一定的参考意义。Abstract: The dynamic response of sandwich plates with identical face sheets separated by compressible PVC (polyvinyl chloride) core subjected to shock loading was investigated. Combined with the three-dimensional digital image correlation technology, the deflection-time history of the back face sheet was measured. Deformation and failure modes of the sheets and core were exhibited to examine the effects of the projectile impulse and the core density. It was found that the fracture and failure occurred mainly at the center of the sandwich plates, and the deflection of the back sheets decreased gradually from the center to the outside, and finally the deformation turned into a corn-like shape. The results indicate that there is a good linear relationship between the projectile impulse and the permanent deflection of the central point of the back face sheets. Reducing the density of the core and raising the thickness of the core can effectively decrease the deflection of the back face sheets while maintaining the quality. The experimental results can provide help for the optimum design of polymer sandwich structures.
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Key words:
- solid mechanics /
- dynamic response /
- impact loading /
- PVC sandwich plate /
- deformation and failure mode
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图 13 泡沫弹冲量与夹芯板挠度的关系
Figure 13. Relation between deflection and impulse for sandwich plates impacted by foam projectiles
图 14 3种不同种结构的中点处挠度时程曲线
Figure 14. Histories of deflection for three different configurations at middle points
表 1 冲击加载夹芯板的实验结果
Table 1. Experimental results of sandwich plates under blast loading
No. v0/(m·s-1) I/(g·m·s-1) w/mm C1-1 92.27 1282.50 9.3 C1-2 98.49 1398.62 11.4 C1-3 137.36 1950.58 16.2 C1-4 189.58 2729.97 21.1 C1-5 260.69 3649.69 33.9 C1-6 274.90 4096.00 C1-7 290.23 4295.41 C2-1 201.92 2927.77 18.1 C3-1 193.78 2848.63 12.7 
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