Li Yuanzhe, Bai Pengpeng, Cao Hui, Li Lvzhou, Li Xinxin, Hou Xin, Fang Jingbo, Li Jingyang, Meng Yonggang, Ma Liran, Tian Yu
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
Sci Adv. 2022 Mar 18;8(11):eabm0984. doi: 10.1126/sciadv.abm0984. Epub 2022 Mar 16.
Traction stress between contact objects is ubiquitous and crucial for various physical, biological, and engineering processes such as momentum transfer, tactile perception, and mechanical reliability. Newly developed techniques including electronic skin or traction force microscopy enable traction stress measurement. However, measuring the three-dimensional distribution during a dynamic process remains challenging. Here, we demonstrated a method based on stereo vision to measure three-dimensional traction stress with high spatial and temporal resolution. It showed the ability to image the two-stage adhesion failure of bionic microarrays and display the contribution of elastic resistance and adhesive traction to rolling friction at different contact regions. It also revealed the distributed sucking and sealing effect of the concavity pedal waves that propelled a snail crawling in the horizontal, vertical, and upside-down directions. We expected that the method would advance the understanding of various interfacial phenomena and greatly benefit related applications across physics, biology, and robotics.
接触物体之间的牵引应力无处不在，对于诸如动量传递、触觉感知和机械可靠性等各种物理、生物和工程过程至关重要。包括电子皮肤或牵引力显微镜在内的新开发技术能够进行牵引应力测量。然而，在动态过程中测量三维分布仍然具有挑战性。在这里，我们展示了一种基于立体视觉的方法，能够以高空间和时间分辨率测量三维牵引应力。它显示了对仿生微阵列两阶段粘附失效进行成像的能力，并展示了弹性阻力和粘附牵引力对不同接触区域滚动摩擦的贡献。它还揭示了推动蜗牛在水平、垂直和倒置方向爬行的凹形踏板波的分布式吸附和密封效果。我们预计该方法将促进对各种界面现象的理解，并极大地惠及物理、生物学和机器人技术等相关应用。
