Abstract
An experimental investigation of the compressive behavior of 64% porosity NiTi alloy was undertaken in this study. Both quasi-static and low-frequency fatigue compressive tests were carried out to obtain the compressive stress-strain curves of specimens. Special attention was paid to the loading-unloading history effect on the stress-strain curves. Full-field surface deformation measurement was carried out via moiré interferometry when specimens were compressed. Inhomogeneous deformation property of the material caused by the porous structure was clearly presented. The loading-unloading history effect was also studied using the moiré interferometry method. Finally real time metallographic analysis during compression tests explained the causes of the loading-unloading history effect of the porous material from microscopic point of view. These findings are believed to be essential elements in the theoretical modeling of compressive behavior especially loading-unloading history effect of the high porosity NiTi alloy, and which still need further systematic examination in the future.
| Original language | English |
|---|---|
| Pages (from-to) | 117-130 |
| Number of pages | 14 |
| Journal | Materials Science and Engineering: A |
| Volume | 515 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 25 Jul 2009 |
| Externally published | Yes |
Keywords
- 64% porosity NiTi alloy
- Full-field surface deformation
- Loading-unloading history
- Metallographical analysis