NONLINEAR STRAIN RATE DEPENDENT COMPOSITE MODEL FOR EXPLICIT FINITE ELEMENT ANALYSIS

 
 
 
 

NONLINEAR STRAIN RATE DEPENDENT COMPOSITE MODEL FOR EXPLICIT FINITE ELEMENT ANALYSIS

Show full item record


Title: NONLINEAR STRAIN RATE DEPENDENT COMPOSITE MODEL FOR EXPLICIT FINITE ELEMENT ANALYSIS
Author: Zheng, Xiahua
Description: With the increasing application of fiber reinforced polymer matrix composites in the aerospace industry, a composite model that has the capability to capture the nonlinear, strain rate dependent deformation behavior of the material is desired for finite element analysis. Polymers are believed to be the major contributors to the nonlinearity and rate dependence of the composites. In this study, the nonlinear, rate dependent constitutive polymer model developed by Goldberg has been modified to incorporate the rate dependence of the elastic modulus and a simple damage model is proposed to improve its unloading prediction. The polymer constitutive equations are then implemented within a strength of material based micromechanics method in order to predict the nonlinear, strain rate dependent deformation of the composite. Strain rate dependent failure criteria and post failure progressive damage model are incorporated into the composite model. The polymer and the composite models are implemented into a commercially available explicit finite element code, LS-DYNA, as user defined materials (UMATs). The deformation behaviors of several representative polymers and two polymer matrix composites of various fiber configurations are simulated in LS-DYNA with the UMATs for a wide range of strain rates, and the numerical results agree well with the experimental data. To expand the application of the unidirectional lamina based composite UMAT, braiding/weaving with through-thickness integration points method is proposed with examples to simulate the deformation behavior of textile composites.
Permanent Link: http://rave.ohiolink.edu/etdc/view?acc_num=akron1145626022
http://hdl.handle.net/2374.OX/3469
Date: 2006

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show full item record