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RESEARCH PAPERS: Special Issue on Time-Dependent Behaviors of Polymer Matrix Composites and Polymers

Modeling Thermo-Oxidative Layer Growth in High-Temperature Resins

[+] Author and Article Information
K. V. Pochiraju

Design & Manufacturing Institute and Dept. of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030

G. P. Tandon

 University of Dayton Research Institute, Dayton, OH 45469

J. Eng. Mater. Technol 128(1), 107-116 (Aug 01, 2005) (10 pages) doi:10.1115/1.2128427 History: Received January 27, 2005; Revised August 01, 2005

This paper describes modeling of degradation behavior of high-temperature polymers under thermo-oxidative aging conditions. Thermo-oxidative aging is simulated with a diffusion-reaction model in which temperature, oxygen concentration, and weight-loss effects are considered. A parametric reaction model based on a mechanistic view of the reaction is used for simulating reaction-rate dependence on the oxygen availability in the polymer. Macroscopic weight-loss measurements are used to determine the reaction and polymer consumption parameters. The diffusion-reaction partial differential equation system is solved using Runge-Kutta methods. Simulations illustrating oxidative layer growth in a high-temperature PMR-15 polyimide resin system under isothermal conditions are presented and correlated with experimental observations of oxidation layer growth. Finally, parametric studies are conducted to examine the sensitivity of material parameters in predicting oxidation development.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Six phases of thermo-oxidative damage evolution that include exposure to oxygen environment, sorption at the boundary, diffusion-reaction, oxidative layer growth, and material damage

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Figure 2

Typical model of reaction rate dependence on concentration

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Figure 3

Active reaction zone variation with time illustrating slowing of the oxidation reaction after 40hr of aging

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Figure 4

Simulations of active zone size for several values of R0

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Figure 5

Schematic of the three zones in thermo-oxidation. The oxidized region is followed by active zone separating the oxidized and unoxidized regions.

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Figure 6

Geometry of the specimen used for aging with all boundaries exposed to oxygen. The oxidized layer, active reaction zone, and the unoxidized regions are illustrated in the sectional view.

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Figure 7

Predicted oxidation layer growth for various R0 and α values and correlation with experimental data at 288°C

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Figure 8

Oxidation layer growth simulations with heterogeneous diffusivity and time-dependent α at 288°C

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Figure 9

Oxidation layer growth simulations with heterogeneous diffusivity and time-dependent α at 343°C

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Figure 10

Simulation results with variable diffusivity for oxidized and unoxidized regions at 343°C

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