How rate-based stretchability of soft solids controls fracture morphology in dynamic conical puncture
How rate-based stretchability of soft solids controls fracture morphology in dynamic conical puncture
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DOI：
10.1016/j.ijimpeng.2024.104911
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发表时间：
2024-02
影响因子：
5.1
通讯作者：
Bingyang Zhang;P. S. Anderson
中科院分区：
文献类型：
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作者：
Bingyang Zhang;P. S. Anderson
穿刺是软材料和生物组织在受到冲击和动态深压痕时发生的主要失效机制。虽然许多穿刺力学的研究集中在与断裂相关的能量和力，大多数现有的模型只捕捉定性的实验测量在低速率和缺乏强大的预测能力的动态裂纹扩展及其材料基础。在这项工作中，我们采用了一种新的实验框架，调查之间的关系的断裂形态和基于速率的最终性能在动态穿刺软和可拉伸材料使用锥形工具。我们发现未变形裂纹和穿刺工具的半尖锥角的切线之间的比例关系，它给出了一个恒定的比率，其大小取决于穿刺过程中的材料中的有效应变率的组合，和材料的粘超弹性本构响应。我们的理论预测的拉伸断裂伸长率和应变率之间的关系表明，从动态圆锥穿刺试验确定的实验结果密切一致。这些研究结果，结合两个进一步的案例研究，证实了死后穿刺损伤表征的可行性，作为一种新的工具，在复杂的软生物材料和生物组织的动态/冲击载荷下提取极限拉伸。
Puncture is a primary failure mechanism occurring in soft materials and biological tissues when subjected to impact and dynamic deep indentation. While many studies on puncture mechanics focus on the energies and forces associated with fracture, most of the existing models only capture qualitatively experimental measures at low rates and lack strong predictive power for the dynamic crack growth and its material basis. In this work, we employ a novel experimental framework to investigate the relationship between the fracture morphology and rate-based ultimate properties during dynamic puncture of soft and stretchable materials using a conical tool. We discover a scaling relationship between the tangents of the half cusp angles of the undeformed crack and the puncture tool, which gives a constant ratio whose magnitude depends on the combination of the effective strain rate in the material during puncture, and the visco-hyperelastic constitutive response of the material. Our theoretical prediction for the relationship between tensile stretch at failure and strain rate shows a close agreement with the experimental results determined from dynamic conical puncture tests. These findings, combined with two further case studies, confirm the feasibility of postmortem puncture damage characterization as a new tool for extracting ultimate stretch in complex soft biomaterials and biological tissues under dynamic/impact loading.