Details

MICROMECHANICS BASED COMPOSITE MATERIAL MODELS FOR CRASHWORTHINESS FINITE ELEMENT SIUMLATION

by YI, WEITAO

Abstract (Summary)
A micromechanical model is developed for laminated unidirectional fiber reinforced composite materials and implemented in the explicit finite element method. The objective of this study is to get an accurate and simple micro-model, which can be used in the displacement-based nonlinear explicit finite element code LS-DYNA. Within the model a representative volume cell is assumed. The micromechanical model implemented in the explicit finite element code can be used for simlulating the behavior of composite structures under various loads such as impact and crash. The stress-strain relation for the micro-model is derived for shell element and solid element. Micro Failure Criterion (MFC) is presented for each material constituent and failure mode. The implemented model is validated through several test examples. As a demonstration case of the stability of the developed micro-model, a finite element model of Graphite/Epoxy tube structure is developed and simulated under axial crash. A good correlation is observed between the predicted and the experiment results in the published literature. Base on the micromechanical model described above, rate dependent inelastic constitutive equations are implemented to predict the strain rate dependent deformation response of a composite material. Another micromechanical model for woven fabric composite with nonlinear stress-strain relation is also developed to simulate crashworthiness of woven composite.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:composite material micromechanics finite element nonlinear crashworthiness

ISBN:

Date of Publication:01/01/2001

© 2009 OpenThesis.org. All Rights Reserved.