10. Quasi-Ductile Behavior of Diesel Particulate Filter Axial Strength Test Bars with Ridges

  1. Manuel E. Brito,
  2. Peter Filip,
  3. Charles Lewinsohn,
  4. Ali Sayir,
  5. Mark Opeka and
  6. William M. Mullins
  1. Gary M. Crosbie1 and
  2. Richard L. Allor2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291283.ch10

Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8

Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8

How to Cite

Crosbie, G. M. and Allor, R. L. (2005) Quasi-Ductile Behavior of Diesel Particulate Filter Axial Strength Test Bars with Ridges, in Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8 (eds M. E. Brito, P. Filip, C. Lewinsohn, A. Sayir, M. Opeka and W. M. Mullins), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291283.ch10

Author Information

  1. 1

    Research and Advanced Engineering, Ford Motor Company MD3083 SRL Bldg.; 2101 Village Road Dearborn, Michigan 48124

  2. 2

    Research and Advanced Engineering, Ford Motor Company MD3135 SRL Bldg.; 2101 Village Road Dearborn, Michigan 48124

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982619

Online ISBN: 9780470291283

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Keywords:

  • honeycomb;
  • frequency;
  • combustion;
  • porosity;
  • continuum

Summary

Since a high porosity is needed to maintain a low backpressure with a diesel paniculate filter, mechanical strength becomes critical in DPF honeycomb structures. In our mechanical tests, we have observed a quasi-ductile stress-strain behavior of the cellular refractories used in exhaust gas aftertreatment. In particular, in 3×3-cell cross-section bend bars used for estimating the axial strength, we find a saw-tooth-type behavior. Associated with this behavior are monotonic decreases in bar stiffness with increasing load, as determined by repeatedly interrupting bar loading and measuring the small decreases in beam resonant frequency. Results are interpreted as the stopping of ridge-borne cracks when the greater crack-front length when the perpendicular wall is reached. This interpretation allows an improvement in a calibration factor for estimating overall honeycomb strength from bend testing of such small bars.