Jiang Xiaochun, Wang Zhengjin, Sun Danqi, Lu Tongqing, Wang Tiejun
State Key Lab for Strength and Vibration of Mechanical Structures, Soft Machines Lab, Department of Engineering Mechanics, Xi'an Jiaotong University, Xi'an, China.
Front Robot AI. 2021 Apr 30;8:673307. doi: 10.3389/frobt.2021.673307. eCollection 2021.
Composite materials have been long developed to improve the mechanical properties such as strength and toughness. Most composites are non-stretchable which hinders the applications in soft robotics. Recent papers have reported a new design of unidirectional soft composite with superior stretchability and toughness. This paper presents an analytical model to study the toughening mechanism of such composite. We use the Gent model to characterize the large deformation of the hard phase and soft phase of the composite. We analyze how the stress transfer between phases deconcentrates the stress at the crack tip and enhances the toughness. We identify two types of failure modes: rupture of hard phase and interfacial debonding. We calculate the average toughness of the composite with different physical and geometric parameters. The experimental results in literature agree with our theoretical predictions very well.
长期以来，人们一直在研发复合材料以改善其诸如强度和韧性等力学性能。大多数复合材料是不可拉伸的，这阻碍了其在软体机器人领域的应用。最近的论文报道了一种具有卓越拉伸性和韧性的单向软复合材料的新设计。本文提出了一个分析模型来研究这种复合材料的增韧机制。我们使用Gent模型来表征复合材料硬相和软相的大变形。我们分析了相之间的应力传递如何使裂纹尖端的应力分散并提高韧性。我们确定了两种失效模式：硬相破裂和界面脱粘。我们计算了具有不同物理和几何参数的复合材料的平均韧性。文献中的实验结果与我们的理论预测非常吻合。
