Abstract
The notch strengthening effect is studied experimentally in closed cell aluminum foams. The limit loads, net section strength were found for a set of double-edge-notched (DEN) and single-edge-notched (SEN) specimens loaded in compression. In addition, the evolution of the deformation is monitored through a digital image correlation procedure. The influence of independently varying the net section width, b. and the crack length to width ratio, a/W is examined. The DEN specimens showed notch-strengthening behavior, while the SEN specimens were found to be notch-insensitive. From the plastic deformation measurements the dominant deformation mode for the SEN specimens was found to be a crushing/twinning mode. The constraint imposed on this twinning mode by the DEN geometry leads to the observed notch-strengthening behavior. A phenomenological model is developed to ratiorialize the observed strength enhancement for the DEN-specimens, featuring a dependence on the ligament width to cell size ratio, b/d. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 2377-2386 |
| Number of pages | 10 |
| Journal | Acta Materialia |
| Volume | 52 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 3-May-2004 |
Keywords
- cellular material
- size effects
- notch
- foam
- net section strength
- TENSILE-STRENGTH
- METALLIC FOAMS
- DEFORMATION
- SIZE
- BEHAVIOR
- MECHANISMS
- CRACKS
- SOLIDS
- MODEL
- HOLES