Delayed fracture caused by time-dependent damage in PDMS
Delayed fracture caused by time-dependent damage in PDMS
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DOI：
10.1016/j.jmps.2023.105459
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发表时间：
2023-10
影响因子：
5.3
通讯作者：
Jikun Wang;Bangguo Zhu;Chung-Yuen Hui;A. Zehnder
中科院分区：
文献类型：
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作者：
Jikun Wang;Bangguo Zhu;Chung-Yuen Hui;A. Zehnder
对聚二甲基硅氧烷（PDMS）的延迟断裂进行了实验和理论研究。以前的工作已经表明，在单边缺口试样的延迟断裂是由时间依赖性损伤，由于断链。在这里，我们研究损伤和弹性场之间的相互作用，使用不同的标本和裂纹的几何形状与钝和尖锐的裂纹。我们的实验表明，初始韧性是没有很好地定义，稳定的缓慢裂纹扩展可以发生在一个范围内的应用负载。我们的实验表明，裂纹扩展速率与外加能量释放速率之间存在着普遍的关系。提出了一个耦合非线性弹性变形和速率相关键断裂的模型，与实验数据符合得很好。
An experimental and theoretical study of delayed fracture of polydimethlsiloxane (PDMS) is presented. Previous works have demonstrated that delayed fracture in single edge notch specimens is caused by time dependent damage due to chain scission. Here we study the interactions between damage and the elastic field using different specimens and crack geometries with blunt and sharp cracks. Our experiments show that initial toughness is not well defined, as stable slow crack growth can occur over a range of applied loads. Our experiments demonstrate that there is a universal relation between crack growth rate and applied energy release rate. A model coupling the nonlinear elastic deformation and rate dependent bond scission is proposed and is in good agreement with experimental data.