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An Orthotropic Integrated Flow-Stress Model for Process Simulation of Composite Materials ? Part I: Two-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:10.1115/1.4041861 History: Received June 05, 2018; Revised October 25, 2018

Abstract

An Integrated Flow-Stress (IFS) model provides a seamless and mechanistic connection between the two distinct regimes during the manufacturing process of composite materials; namely, fluid flow in the pre-gelation stage of the thermoset resin, and stress development in the composite when it acts as a solid material. In this two-part paper, the two- and three-phase isotropic IFS models previously developed by the authors, are extended to the general case of composite materials with orthotropic constituents. Part I presents the two-phase, fluid-solid, orthotropic model formulation for the case where the fluid phase solidifies during the course of curing. Part II [1] extends the orthotropic formulation to a three-phase model that includes a gas phase as the third constituent of the composite material system. A broader definition of material properties in poroelasticity formulation is adopted in development of the general orthotropic formulation. The model is implemented in a 2D plane strain u-v-P finite element code and its capability in predicting the flow-compaction behaviour and stress development is demonstrated through application to a case study involving an L-shaped unidirectional laminate undergoing curing on a conforming convex tool. Comparison of the results with those obtained from sequential modelling of flow and stress development regimes reveal the importance of capturing the simultaneous and interactive effect of the mechanisms involved during the entire process cycle using an integrated flow-stress modelling approach presented in this paper.

Copyright (c) 2018 by ASME
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