Application of Optimization Methodology and Specimen Specific Finite Element Models for Investigating Material Properties of Rat Skull

Author(s): 
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Wayne State University, Henry Ford Hospital, FENGJIAO GUAN, XU HAN, HAOJIE MAO, CHRISTINA WAGNER, YENER N. YENI, and KING H. YANG

CHALLENGE | Develop the most favorable material property parameters to develop finite element (FE) models of rat skull bone samples.This study represents a preliminary effort in the development and validation of FE models for the rat skull used to predict the reaction of traumatic brain injuries (TBI) in humans.

SOLUTION | Sample-specific FE models were prepared to eliminate any geometric effect due to inter-sample variations on model predicted force–deflection curves. An optimization-based material identification method was developed with modeFRONTIER to minimize differences in three-point bending test responses between experimental and simulation results and accurately identify the material parameters sought.

BENEFIT | modeFRONTIER automatically updated input parameters and submitted new keyword files to LS-DYNA, which ran in MPP mode, to reduce the time needed in completely the task. This same method can be used to other reverse engineering procedures to obtain accurate material parameters for FE models development.