Study of skin frictions based on SPH-FEM finger model
CHEN Si 1,2, QIAO Xiaoqi1,LI Tianbo3,WANG Hao3,YANG Jianan1,WANG Dongqing4*
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Department of Mechanical Engineering, University of Colorado, Boulder, colls 80309; 3. School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 4. School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：A finger modeling method based on finite element and smooth particle dynamics coupling algorithm(SPH-FEM)is proposed while optimizing the adaptability of the model under large and extreme deformation, to solve the problem that the traditional Lagrange FEM finger-modeling has great deviation for large deformation. and the solid-fluid biphasic behavior of subcutaneous tissue. In addition, due to the ″meshless″ property of the SPH-FEMmethod itself, it hasa natural advantage onthe simulation of the skin tissue exhibiting fluid-solid biphasic propertiesover the traditional finite element method(FEM). SPH-FEM finger model was established. The spike penetration simulation experiment and the plate friction simulation experiment were carried out to investigate the stress and strain of skin. In addition, in order to verify the rationality and effectiveness of the SPH-FEM finger modeling me-thod, it was compared with the FEM finger model. The resultsshow that the SPH-FEM finger model isconsistent with the traditional FEM method in the overall deformation,and the response speed is significantly higher than that of the FEM finger model when dealing with large deformation, but there is a certain hysteresis; the accuracy of the SPH-FEM finger model in small deformation is slightly insufficient.
