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.

Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
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

Grahic Jump Location
Figure 2

Typical model of reaction rate dependence on concentration

Grahic Jump Location
Figure 3

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

Grahic Jump Location
Figure 4

Simulations of active zone size for several values of R0

Grahic Jump Location
Figure 5

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

Grahic Jump Location
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.

Grahic Jump Location
Figure 7

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

Grahic Jump Location
Figure 8

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

Grahic Jump Location
Figure 9

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

Grahic Jump Location
Figure 10

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



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In