Modeling of Three-Dimensional Soft Tissue Deformation with DynamicNonlinear Finite Element

摘要

Soft tissue deformation is a significant part of surgical simulation. This paper presents a dynamic nonlinear finite element method for modeling of soft tissue deformation. This method models large-range deformation via the secondorder Piola-Kirchhoff stress. It condenses the stiffness matrix to reduce the degrees of freedom of the entire soft body at each node for every time step to improve the computational performance. Simulations and comparison analysis show that the proposed method can predict the nonlinear behaviors of soft tissues and requires a small amount of time.