Dynamic finite element analysis of stress and fracture in IM7/8552 monolithic composite laminates under impact loading conditions.

摘要

This study used the finite element method to evaluate impact resistance and dynamic stress intensity factors (DSIFs) of the composite laminate, IM7/8552, using the FEA package, ANSYS, to find normalized von Mises stress as well as orthotropic SIFs for the 11 layer laminate. It was performed for six common carbon fibers for this material. An approach was taken to obtain an optimal design for the IM7/8552 composite and was based on the idea that the composition of the laminate such as the fiber orientations within each individual lamina, directly effects the physical properties of the laminate. The last part of this study focused on dynamic fracture analysis for the IM7/8552 multilayered composite laminate. The normalized mode-I DSIF was calculated using results from the ANSYS model. It was found that the higher values of fiber volume fraction yielded better results and that material composition does directly affect resistance to impact loading.