Physical Parameter Identification of Rheological Object Based on FE Dynamic Model

There are many kinds of deformable objects in our living life. Some of them demonstrate rheological behaviors during deformation, such as food, clay, human tissues, and organs. Usually, finite element (FE) model was employed to restructure or simulate the deformation behavior of such objects. However, there are important physical parameters to be known before simulation. In this paper, we presented an approach to estimate the physical parameters of rheological object based on FE dynamic model. Firstly, 1D FE dynamic model was described briefly and simulations were done with initial parameters. Secondly, the identification method was proposed according to analysis of deformation behavior and the identification results of simulation were given. Thirdly, this method was extended to 2D/3D deformation and experiment was done by using clay as rheological object. Finally, identification results of experiment were given and a new model for describing rheological deformation was proposed based on the curve fitting of force relaxation for experiment data.