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An experimental study of high-velocity impact on elastic-plastic crushable polyurethane foams

机译：高速冲击对弹塑性可压碎聚氨酯泡沫的影响

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The mechanical behavior of elastic-plastic polyurethane foams was studied experimentally under high velocity local impact loading in normal and oblique directions, in particular, the energy absorption and the situation of damage zone were investigated. In order to obtain the mechanical properties, at first quasi-static compressive global loading was performed on the foams. Then, several samples of rigid polyurethane with different thicknesses (between 10 and 80 mm) and densities (between 40 and 320 kg/m(3)) were prepared and subjected to high-velocity normal impact loading (with projectile velocity range between 30 and 140 m/s). The results showed that the foam with density of 320 (kg/m(3)) at thickness of 40 (mm) has the highest energy absorption between them and also increasing the density and thickness of the foam increases the energy absorption and the area of the damage zone on rear side of the foam. Furthermore, it was found that the damage area consists of two different cylindrical and frustum-like zones. It was shown that the absorbed energy was dependent on both density and thickness; therefore, it was attempted to statistically formulize the relationship between absorbed energy on the one hand and thickness and density on the other hand based on experimental data. The effect of projectile nose including the five shapes such as flat-ended, hemi-spherical, semi-elliptical, right-conical and sharp-conical was investigated on penetration depth of projectile into the target. The results have revealed that the penetration depth increases with decreasing in the curvature radius of projectile nose cross-section; hence, the foams were too weak against sharp noses. On the other hand, performing the oblique impacts showed that increasing the oblique angle increases the damage area and changes the shape of rear side from ellipsoid-like to triangle-shape. (C) 2015 Elsevier Masson SAS. All rights reserved.
机译：实验研究了弹塑性聚氨酯泡沫在高速和局部高速冲击载荷下在正向和斜向的力学行为，特别是研究了能量吸收和损伤区域的情况。为了获得机械性能，首先对泡沫进行准静态压缩整体加载。然后，制备了几个具有不同厚度（在10到80毫米之间）和密度（在40到320千克/平方米（3）之间）的硬质聚氨酯样品，并经受了高速法向冲击载荷（射弹速度范围在30到30毫米之间）。 140 m / s）。结果表明，在厚度为40（mm）时密度为320（kg / m（3））的泡沫在它们之间具有最高的能量吸收，并且增大泡沫的密度和厚度会增加能量吸收，并且泡沫的面积增大。泡沫背面的损坏区域。此外，发现损坏区域由两个不同的圆柱和截头圆锥形区域组成。结果表明，吸收的能量取决于密度和厚度。因此，尝试基于实验数据来统计地一方面公式化吸收能量与另一方面厚度和密度之间的关系。研究了弹头对包括弹头，平头，半球形，半椭圆形，右圆锥形和尖圆锥形在内的五种形状对弹丸穿透目标的影响。结果表明，穿透深度随着弹头横截面曲率半径的减小而增加。因此，泡沫对于尖锐的鼻子来说太弱了。另一方面，进行倾斜冲击表明，增加倾斜角度会增加损伤面积，并使后侧的形状从椭圆形变为三角形。 （C）2015 Elsevier Masson SAS。版权所有。

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