Abstract: Based on finite element method(FEM), the visualization research on the power flow of cracked structure is implemented. The concept of structural intensity(SI) is introduced, the expressions of shell element and solid element in FEM are given. The concept of streamline visualization is given and applied to the visualization of the SI streamline. The plots of displacement vector, SI vector and SI streamline of cracked structure are obtained, which realizes the visualization of energy distribution, propagation on the surface of structure and around the crack, and provides a new tool to understand the distribution of energy in damaged structures and damage detection.

Key words: Damaged structure, Finite element method, Structural intensity, Visualization of streamline