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An Orthotropic Integrated Flow-Stress Model for Process Simulation of Composite Materials ? Part II: Three-Phase Systems

[+] Author and Article Information
Sina Amini Niaki

Composites Research Network (CRN), Departments of Civil Engineering and Materials Engineering, The University of British Columbia, Vancouver, B.C., V6T 1Z4, Canada
sina@composites.ubc.ca

Alireza Forghani

Convergent Manufacturing Technologies Inc., 6190 Agronomy Rd, Suite 403, Vancouver B.C., V6T 1Z3, Canada
alireza.forghani@convergent.ca

Reza Vaziri

Composites Research Network (CRN), Departments of Civil Engineering and Materials Engineering, The University of British Columbia, Vancouver, B.C., V6T 1Z4, Canada
reza.vaziri@ubc.ca

Anoush Poursartip

Composites Research Network (CRN), Departments of Civil Engineering and Materials Engineering, The University of British Columbia, Vancouver, B.C., V6T 1Z4, Canada
anoush.poursartip@ubc.ca

1Corresponding author.

ASME doi:10.1115/1.4041862 History: Received June 05, 2018; Revised October 25, 2018

Abstract

In the current paper, the two-phase orthotropic integrated flow-stress (IFS) process model presented in Part I [1] is extended to a three-phase model where the third phase accounts for the presence of gas in the composite material system. The gas flow and its compressibility are taken into account while the seamless transformation of the resin material from its initially liquid stage to a cured solid material is incorporated within the previously developed IFS framework. A three-phase orthotropic flow model is employed to describe the behaviour of the composite material during the pre-gelation stage of the process cycle which transforms continuously to a solid mechanics model using a stepwise three-phase micromechanics. The model is implemented in a u-v-P plane strain finite element code similar to that presented in Part I but with extended degrees of freedom accounting for the velocity and pressure of the gas phase. The numerical model is applied to the debulking and curing process of an L-shaped unidirectional composite laminate. Performance of the model is assessed through evaluating the process-induced deformations and residual porosity distribution over the domain of the laminate.

Copyright (c) 2018 by ASME
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