Density‐Dependent Impact Resilience and Auxeticity of Elastomeric Polyurea Foams
Density‐Dependent Impact Resilience and Auxeticity of Elastomeric Polyurea Foams
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密度——弹性聚脲泡沫的相关冲击回弹力和拉胀性
DOI：
10.1002/adem.202200578
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发表时间：
2022
影响因子：
3.6
通讯作者：
Koohbor, Behrad
中科院分区：
文献类型：
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作者：
Youssef, George;Kokash, Yazeed;Uddin, Kazi Zahir;Koohbor, Behrad
本文研究了不同密度的新型聚脲泡沫塑料在不同能量（1.77~7.09 J）下的单次和多次冲击下的动态响应。在冲击事件期间获得冲击和传递力-时间历史。还使用高速摄影记录样品的变形，并使用数字图像相关（DIC）进行分析，以表征密度相关应变率和泊松比。力-时间历程的分析突出了输入冲击能量和力特性（包括振幅和持续时间）之间的相互关系。实验结果表明，聚脲泡沫可以吸收近50%的传入的冲击能量，而不管它们的密度。即使在对相同样品进行连续冲击事件后，泡沫的动态冲击功效仍然存在，在连续七次冲击后，承载能力仅下降20%。此外，如通过电子显微镜观察所验证的，较高密度的泡沫没有表现出任何永久性损坏。这种高密度聚脲泡沫在本文考虑的所有冲击能量下均显示出可逆的拉胀转变。这项研究的结果表明，聚脲泡沫缓冲和冲击缓解应用的适用性，特别是在重复的生物力学影响的情况下。
This research investigates the dynamic response of a novel polyurea foam with different densities by separately submitting samples to single and multiple impacts at different energies ranging from 1.77 to 7.09 J. The impact and transmitted force‐time histories are acquired during the impact events. Deformation of the samples is also recorded using high‐speed photography and analyzed using digital image correlation (DIC) to characterize density‐dependent strain rate and Poisson's ratio. The analyses of the force‐time histories highlight the interrelationship between the incoming impact energy and force characteristics, including amplitude and durations. The experimental results reveal that polyurea foams can absorb nearly 50% of the incoming impact energy irrespective of their density. The dynamic impact efficacy of the foam persists even after sequential impact events are imparted on the same samples, with only a 20% drop in the load‐bearing capacity after seven consecutive impacts. Furthermore, as verified via electron microscopy observations, the higher‐density foam does not exhibit any permanent damage. This high‐density polyurea foam shows reversible auxetic transition at all impact energies considered herein. The outcomes of this research indicate the suitability of polyurea foams for cushioning and impact mitigation applications, especially in repeated biomechanical impact scenarios.
使用聚脲进行生物力学影响管理
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
J. Citron
通讯作者：
J. Citron