Logozzo Silvia, Valigi Maria Cristina, Malvezzi Monica
Department of Engineering, University of Perugia, Via Duranti, 06125 Perugia, Italy.
Department of Information Engineering and Mathematics, University of Siena, Italy.
MethodsX. 2022 Jul 8;9:101781. doi: 10.1016/j.mex.2022.101781. eCollection 2022.
This paper presents a methodology to study the contact of human fingers with surfaces based on 3D techniques. This method helps to investigate the fingertip mechanical properties which are crucial for designing haptic interfaces. The dependence of the fingertip deformation on the applied forces is obtained both with theoretical and experimental approaches. The experimental procedure is based on digital measurements by 3D optical scanners to reconstruct the geometry of the fingertip impression and on force measurements by an instrumented plate. Results highlight the force-displacement trend and can be validated with a Finite Element Model (FEM), with data from literature or with measurements at a force-strain gauge. Gross contact areas, radii and work of adhesion are also detected, and results are compared with contact models available in literature. • A sensorized plate with a thin force sensitive resistor and a dough material layer is used to measure the contact force corresponding to a specific digital imprint. • 3D indentation maps are obtained and evaluated by comparing the 3D scan model of fingertips during imprinting with the digital model of the undeformed fingers and of the imprints. • Force-displacement results can be validated by comparison with a developed FEM, a force-displacement gauge or literature outcomes.
本文提出了一种基于三维技术研究人类手指与表面接触的方法。该方法有助于研究对于设计触觉界面至关重要的指尖力学特性。通过理论和实验方法均可获得指尖变形与所施加力之间的关系。实验过程基于三维光学扫描仪的数字测量以重建指尖压痕的几何形状，以及基于仪器化平板的力测量。结果突出了力 - 位移趋势，并且可以通过有限元模型（FEM）、文献数据或力 - 应变仪测量进行验证。还检测了总接触面积、半径和粘附功，并将结果与文献中可用的接触模型进行比较。• 使用带有薄力敏电阻和面团材料层的传感平板来测量与特定数字印记相对应的接触力。• 通过将压印过程中指尖的三维扫描模型与未变形手指和压痕的数字模型进行比较，获得并评估三维压痕图。• 力 - 位移结果可以通过与所开发的有限元模型、力 - 位移仪或文献结果进行比较来验证。
