Experimental and Computational Study of the Shearing Resistance of Polyurea at High Pressures and High Strain Rates

Grujicic Mica; Yavari R.; Snipes J. S.; Ramaswami S.; Jiao T.; Clifton R. J.

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Experimental and Computational Study of the Shearing Resistance of Polyurea at High Pressures and High Strain Rates

机译：高压高应变速率下聚脲抗剪强度的实验与计算研究

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Mechanical response of polyurea, a nanophase segregated elastomeric co-polymer, is investigated using all-atom, equilibrium, molecular-dynamics methods and tools. Specifically, the effects of high pressure (1-30 GPa) and high strain rate (10(5)-10(6) s(-1)) on the shearing resistance of polyurea are examined. Such loading conditions are encountered by polyurea coatings subjected to impact by high-velocity projectiles, shell shrapnel, and improvised explosive device fragments. Computed results are compared with their experimental counterparts obtained using the so-called pressure-shear plate impact experiments. Computed results have also been rationalized in terms of the nanosegregated polyurea microstructure consisting of rod-shaped, discrete, the so-called hard domains embedded in a highly compliant, the so-called soft matrix. By analyzing molecular-level microstructure and its evolution during high-rate deformation and under high imposed pressures, an attempt is made to identify and quantify main phenomena in viscous/inelastic deformation and microstructure-reorganization processes that are most likely responsible for the observed mechanical response of polyurea.

机译：使用全原子，平衡，分子动力学方法和工具研究了聚脲（一种纳米相分离的弹性体共聚物）的机械响应。具体而言，研究了高压（1-30 GPa）和高应变速率（10（5）-10（6）s（-1））对聚脲抗剪切力的影响。受到高速射弹，弹片和简易爆炸装置碎片撞击的聚脲涂层会遇到这种加载条件。将计算结果与使用所谓的压剪板冲击实验获得的实验结果进行比较。就纳米分离的聚脲微观结构而言，计算结果也已得到合理化，该结构由杆状，离散的，嵌入高顺应性的所谓的软结构域（即所谓的软基质）组成。通过分析分子水平的微观结构及其在高速变形和高施加压力下的演变，尝试识别和量化粘性/非弹性变形和微观结构重组过程中最可能引起观察到的机械响应的主要现象聚脲。

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《Journal of Materials Engineering and Performance》 |2015年第2期|共21页
作者
Grujicic Mica; Yavari R.; Snipes J. S.; Ramaswami S.; Jiao T.; Clifton R. J.;
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正文语种 eng
中图分类金属学与金属工艺;工程材料学;
关键词
high-pressure/high-strain-rate mechanical response; molecular-level modeling and simulations; polyurea;

机译：高压/高应变率机械响应;分子水平的建模与仿真;聚脲;

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2. Experimental and Computational Study of the Shearing Resistance of Polyurea at High Pressures and High Strain Rates [J] . Grujicic Mica, Yavari R., Snipes J. S., Journal of Materials Engineering and Performance . 2015,第2期

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机译：高应变速率下流变应力的实验/计算评估及其在绝热剪切带中的应用

Experimental and Computational Study of the Shearing Resistance of Polyurea at High Pressures and High Strain Rates

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