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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Postmortem Analysis Using Different Sensors and Technologies on Aramid Composites Samples after Ballistic Impact
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Postmortem Analysis Using Different Sensors and Technologies on Aramid Composites Samples after Ballistic Impact

机译：弹道撞击后使用不同传感器和技术对芳纶复合材料样品进行事后分析

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This work focuses on the combination of two complementary non-destructive techniques to analyse the final deformation and internal damage induced in aramid composite plates subjected to ballistic impact. The first analysis device, a 3D scanner, allows digitalising the surface of the tested specimen. Comparing with the initial geometry, the permanent residual deformation (PBFD) can be obtained according to the impact characteristics. This is a significant parameter in armours and shielding design. The second inspection technique is based on computed tomography (CT). It allows analysing the internal state of the impacted sample, being able to detect possible delamination and fibre failure through the specimen thickness. The proposed methodology has been validated with two projectile geometries at different impact velocities, being the reaction force history on the specimen determined with piezoelectric sensors. Different loading states and induced damages were observed according to the projectile type and impact velocity. In order to validate the use of the 3D scanner, a correlation between impact velocity and damage induced in terms of permanent back face deformation has been realised for both projectiles studied. In addition, a comparison of the results obtained through this measurement method and those obtained in similar works, has been performed in the same range of impact energy. The results showed that CT is needed to analyse the internal damage of the aramid sample; however, this is a highly expensive and time-consuming method. The use of 3D scanner and piezoelectric sensors is perfectly complementary with CT and could be relevant to develop numerical models or design armours.
机译：这项工作着眼于两种互补的非破坏性技术的结合，以分析芳纶复合材料板在受到弹道冲击后的最终变形和内部损伤。第一个分析设备，即3D扫描仪，可以数字化被测样品的表面。与初始几何形状相比，可以根据冲击特性获得永久残余变形（PBFD）。这是盔甲和屏蔽设计的重要参数。第二种检查技术基于计算机断层扫描（CT）。它可以分析受冲击样品的内部状态，并能够通过样品厚度检测可能的分层和纤维破坏。所提出的方法已经在不同的冲击速度下以两种弹丸几何形状进行了验证，这是使用压电传感器确定的试样上的反作用力历史。根据弹丸类型和撞击速度，观察到不同的载荷状态和诱发的损伤。为了验证3D扫描仪的使用，已经针对两种研究的射弹实现了撞击速度与永久性背面变形引起的损伤之间的相关性。另外，在相同的冲击能量范围内，对通过这种测量方法获得的结果与通过类似工作获得的结果进行了比较。结果表明，需要使用CT分析芳纶样品的内部损伤。但是，这是一种非常昂贵且耗时的方法。 3D扫描仪和压电传感器的使用与CT完美互补，可能与开发数值模型或设计铠装有关。

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