Mapping deformation and dissipation during fracture of soft viscoelastic solid
Mapping deformation and dissipation during fracture of soft viscoelastic solid
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绘制软粘弹性固体断裂过程中的变形和耗散
DOI：
10.1016/j.jmps.2024.105595
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发表时间：
2024
影响因子：
5.3
通讯作者：
Long, Rong
中科院分区：
文献类型：
--
作者：
Qi, Yuan;Li, Xueyu;Venkata, Sairam Pamulaparthi;Yang, Xingwei;Sun, Tao Lin;Hui, Chung-Yuen;Gong, Jian Ping;Long, Rong
在粘弹性固体中，扩展裂纹周围的能量耗散是提高断裂韧性的主要机制。这种耗散在空间上是不均匀的，并且由于粘弹性的历史依赖性而与裂纹扩展过程高度耦合。本文提出了一种实验方法来绘制软粘弹性固体中裂纹扩展过程中的耗散场。具体来说，我们跟踪随机分布的示踪粒子来测量不断变化的变形场。然后将测量的变形场放入非线性本构模型中以确定耗散场。我们的方法被用来调查周围的变形和耗散场的传播裂纹在聚两性电解质（PA）水凝胶。变形场的测量使我们能够评估通常假设的平移不变性粘弹性断裂理论是否在实际实验中成立。此外，通过将得到的变形场与非线性粘弹性模型相结合，我们捕获了裂纹扩展过程中耗散场的完整历史。我们发现，甚至在距离裂纹尖端几毫米的材料点处也发生耗散。映射的耗散场也使粘弹性水凝胶的断裂韧性的固有和耗散组件的单独测定。
Energy dissipation around a propagating crack is the primary mechanism for the enhanced fracture toughness in viscoelastic solids. Such dissipation is spatially non-uniform and is highly coupled to the crack propagation process due to the history-dependent nature of viscoelasticity. We present an experimental approach to map the dissipation field during crack propagation in soft viscoelastic solid. Specifically, we track randomly distributed tracer particles to measure the evolving deformation field. The measured deformation field is then put into a nonlinear constitutive model to determine the dissipation field. Our methodology was used to investigate the deformation and dissipation fields around a propagating crack in a Polyampholyte (PA) hydrogel. The deformation field measurements allowed us to assess whether the commonly assumed translational invariance in viscoelastic fracture theories holds true in practical experiments. Furthermore, by combining the obtained deformation fields with a nonlinear viscoelastic model, we captured the complete history of the dissipation field during crack propagation. We found that dissipation occurred even at material points that are a few millimeters away from the crack tip. The mapped dissipation field also enabled the separate determination of the intrinsic and dissipative components of fracture toughness for the viscoelastic hydrogel.
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坚韧自愈聚两性电解质水凝胶中的多尺度能量耗散机制
DOI：
--
发表时间：
2019
期刊：
影响因子：
--
作者：
Kunpeng Cui;Takayuki Kurokawa;Jian Ping Gong
通讯作者：
Jian Ping Gong
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影响因子：
4.7
作者：
Wang, Jikun;Cui, Kunpeng;Zhu, Bangguo;Gong, Jian Ping;Hui, Chung-Yuen;Zehnder, Alan T.
通讯作者：
Zehnder, Alan T.
影响因子：
3.4
作者：
Zhao X
通讯作者：
Zhao X
影响因子：
4.7
作者：
Guo, Qiang;Caillard, Julien;Colombo, Davide;Long, Rong
通讯作者：
Long, Rong
影响因子：
5.3
作者：
Qi, Yuan;Zou, Zhanan;Long, Rong
通讯作者：
Long, Rong