Momentum transfer on impact damping by liquid crystalline elastomers.
Momentum transfer on impact damping by liquid crystalline elastomers.
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DOI：
10.1038/s41598-023-37215-9
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发表时间：
2023-06-20
影响因子：
4.6
通讯作者：
Terentjev, Eugene M.
中科院分区：
文献类型：
--
作者：
Guo, Hongye;Terentjev, Andrew;Saed, Mohand O.;Terentjev, Eugene M.
弹性体阻尼垫的效果，软化硬物体的碰撞，进行了研究，比较参考硅树脂弹性体和多畴液晶弹性体，其具有更优越的上级内部耗散机制。我们特别关注的不仅仅是能量耗散，而且在碰撞过程中的动量守恒和转移，因为后者决定了施加在目标和/或撞击器上的力，并且是在撞击的短时间内造成损害的力，而能量可能在更长的时间尺度上耗散。为了更好地评估动量转移，我们比较了与非常重的物体的碰撞和与相当质量的碰撞，当一些撞击动量保留在远离碰撞的目标中时。我们还提出了一种方法来估计弹性体阻尼垫的最佳厚度，以最大限度地减少冲击器反弹的能量。已经发现，较厚的垫引入大的弹性回弹，因此最佳厚度是不遭受机械故障的最薄的可能的垫。我们发现我们的估计的最小厚度的弹性体穿刺之前，通过发生和实验观察之间有很好的协议。
The effect of elastomeric damping pads, softening the collision of hard objects, is investigated comparing the reference silicone elastomer and the polydomain nematic liquid crystalline elastomer, which has a far superior internal dissipation mechanism. We specifically focus not just on the energy dissipation, but also on the momentum conservation and transfer during the collision, because the latter determines the force exerted on the target and/or the impactor—and it is the force that does the damage during the short time of an impact, while the energy might be dissipated on a much longer time scale. To better assess the momentum transfer, we compare the collision with a very heavy object and the collision with a comparable mass, when some of the impact momentum is retained in the target receding away from the collision. We also propose a method to estimate the optimal thickness of an elastomer damping pad for minimising the energy in impactor rebound. It has been found that thicker pads introduce a large elastic rebound and the optimal thickness is therefore the thinnest possible pad that does not suffer from mechanical failure. We find good agreement between our estimate of the minimal thickness of the elastomer before the puncture through occurs and the experimental observations.
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影响因子：
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