In-silico experimentations of multimode shock response of polyurea
In-silico experimentations of multimode shock response of polyurea
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聚脲多模式冲击响应的计算机实验
DOI：
10.1016/j.ijmecsci.2021.106542
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发表时间：
2021
影响因子：
7.3
通讯作者：
Youssef, George
中科院分区：
文献类型：
--
作者：
Gamez, Carlos;Huynh, Nha Uyen;Youssef, George
在没有侵入性全场测量和可视化的情况下，计算研究可以补充现有的高应变率实验技术。在这项研究中，一个计算模型来阐明各种现象伴随的产生，传播和相互作用的多模冲击波的粘弹性材料。具体地，将厚度为0.5mm的直径为4mm的聚脲塞建模为线性粘弹性固体，其中使用Prony系列描述剪切模量的松弛行为，而基于聚脲的泊松比假设体积模量为线性弹性。结果在三个案例研究，在不同类型的冲击波强调在每种情况下，而集中在该地区的前沿和后缘的冲击波阵面。通常，波前与伴随的和反射的波相互作用，导致损害所寻求的加载条件的纯度，特别是在接近自由表面的波的回程期间。在案例研究I中，激光诱导的压力波的传播在朝向自由表面的前向行程期间保持纯净，但受到伴随的剪切波和侧球形图案压力波的影响。案例研究II模拟了表面波的产生，将一个环形的加载网站，在释放的表面位移被发现集中和放大的中心点。在最后一个案例研究中，案例研究III，施加的剪切波在100应变率产生二次压力和水平剪切波的边缘加载网站，这复杂的加载方案，但提供了新的见解激光产生的冲击波的相互作用在固体。研究结果可用于改进实验数据的分析，以量化聚合物在超高速撞击下的变形和破坏机制。
Computational studies can supplement existing ultrahigh strain rate experimental techniques in the absence of invasive full-field measurement and visualization. In this study, a computational model is employed to elucidate various phenomena accompanying the generation, propagation, and interaction of multimode shock waves in a viscoelastic material. Specifically, a 4 mm diameter polyurea plug with a thickness of 0.5 mm was modeled as a linear viscoelastic solid, where the relaxation behavior of the shear modulus was described using a Prony series while the bulk modulus was assumed to be linear elastic based on the Poisson's ratio of polyurea. The results are presented in three case studies, where a different type of shock wave was emphasized in each case while focusing on the regions at the leading and trailing edges of the shock wavefront. Generally, the wavefront interacted with the accompanying and reflected waves, resulting in compromising the purity of the sought-after loading condition, especially during the return trip of the wave upon approaching the free surface. In Case Study I, the propagation of laser-induced pressure wave remained pure during the forward trip towards the free surface but was compromised by the accompanying shear wave and side spherical patterned pressure waves. Case Study II simulated the generation of surface waves by incorporating a ring-shaped loading site, where the release of a surface displacement was found to be focused and amplified at the central point. In the final case study, Case Study III, the applied shear wave at ultrahigh strain rate generated secondary pressure and horizontal shear waves at the edges of the loading site, which complicated the loading scenario but provided new insight into the interaction of laser-generated shock waves within the solid. The results can be used to improve the analysis of experimental data to quantify the accompanying deformation and failure mechanisms of polymers subjected to hypervelocity impacts.
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影响因子：
2.3
作者：
V. Gupta;Jun Yuan;A. Pronin
通讯作者：
V. Gupta;Jun Yuan;A. Pronin
影响因子：
5.9
作者：
Ian Whitten;G. Youssef
通讯作者：
Ian Whitten;G. Youssef
第 14 章 – 激光焊接的应用
DOI：
--
发表时间：
1997
期刊：
影响因子：
--
作者：
J. Ready
通讯作者：
J. Ready
通过激光诱导冲击波表征晶圆间键合强度
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
G. Youssef;C. Moulet;M. Goorsky;V. Gupta
通讯作者：
V. Gupta
通过激光散裂测量薄膜-基材结合强度
DOI：
--
发表时间：
1978
期刊：
影响因子：
--
作者：
J. Vossen
通讯作者：
J. Vossen