Abstract
The apparent fracture toughness of a porous cordierite ceramic was estimated using a large specimen whose geometry was inspired by the ASTM-C1421-standardized chevron-notch beam. Using the same combination of experiment and analysis used to develop the standardized chevron-notch test for small, monolithic ceramic bend bars, an apparent fracture toughness of 0.6 and 0.9 MPa√m were estimated for an unaged and aged cordierite diesel particulate filter structure, respectively. The effectiveness and simplicity of this adapted specimen geometry and test method lends itself to the evaluation of (macroscopic) apparent fracture toughness of an entire porous-ceramic, diesel particulate filter structure.
| Original language | English |
|---|---|
| Pages (from-to) | 383-391 |
| Number of pages | 9 |
| Journal | International Journal of Applied Ceramic Technology |
| Volume | 14 |
| Issue number | 3 |
| DOIs | |
| State | Published - May 1 2017 |
Funding
The authors thank Fresno State University's M. Jenkins and NASA-Glenn's J. Salem for their helpful insights, ORNL's R. Parten for the specimen machining, National Renewable Energy Laboratory's R. McCormick and ORNL's T. Toops for conducting the DPF aging test, and ORNL's E. Lara-Curzio and A. Shyam for their review of the manuscript. Support from the National Biodiesel Board, the United Soybean Board, and the U.S. Department of Energy, Vehicle Technologies Office, Propulsion Materials Program is gratefully acknowledged. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
Keywords
- diesel particulate filter
- fracture mechanics/toughness
- porous materials
- toughness