Abstract
Effects of the sintering characteristics and the number of layers on cracking and warping of graded powder compacts were studied experimentally and the internal stress was analyzed theoretically with the finite element method to find the condition for crack formation. Many cracks were observed on the surface of the top ceramic layer when the number of layers was large. Although the direction of warping of the compacts depends on the sintering characteristics of the top layer, it does not influence crack formation. In this analysis, the tensile stress is found to be produced in the top layer as a consequence of constrained shrinkage and warpage in the multilayered compacts. Even when the mismatch stress due to the constrained shrinkage is small in the top layer, the tensile stress on the top surface does not decrease much, because the bending stress compensates it.
| Original language | English |
|---|---|
| Pages (from-to) | 785-790 |
| Number of pages | 6 |
| Journal | Key Engineering Materials |
| Volume | 233-236 |
| Issue number | II |
| Publication status | Published - Jan 1 2002 |
| Externally published | Yes |
| Event | Proceedings of the 6th Asia-Pacific Symposium on Engineering Plasticity and Its Applications (AEPA2002) - Sydney, NSW, Australia Duration: Dec 2 2002 → Dec 6 2002 |
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering