Impression Creep of PMR-15 Resin at Elevated Temperatures
Abstract
The polyimides formed from the polymerization of monomeric-reactants (PMR) approach have been increasingly used as matrix materials in fiber-reinforced composites on aerospace and space structures for high temperature applications. The performance of PMR-based structures depends on the mechanical durability of PMR resins at elevated temperatures, including creep and stress relaxation. In this work, the creep behavior of PMR-15 resin was studied using the impression technique in the temperature range of 76-381 MPa. It was found that there existed a steady state creep for the creep tests performed at temperatures of 563 K and higher, from which a constant impression velocity was calculated. The steady state impression velocity increased with temperature and punching stress with the stress exponent in the range of 1.5-2.2. The average of the apparent activation energy of the PMR-15 was calculated at 122.7 +/- 6.1 kJ/mol.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2010
- Accession Number
- ADA513403
Entities
People
- Fuqian Yang
- G. A. Schoeppner
- G. P. Tandon
- Rong Chen
- Yili Lu
Organizations
- University of Kentucky