Assessment of Elasticity, Plasticity and Resistance to Machining-induced Damage of Porous Pre-sintered Zirconia Using Nanoindentation Techniques
| Autor: | Ling Yin, Abdur-Rasheed Alao |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics Mechanical Engineering Machinability technology industry and agriculture Metals and Alloys Elastic energy Fracture mechanics 030206 dentistry 02 engineering and technology Plasticity Nanoindentation 021001 nanoscience & nanotechnology 03 medical and health sciences 0302 clinical medicine Mechanics of Materials Indentation Materials Chemistry Ceramics and Composites Composite material Deformation (engineering) Elasticity (economics) 0210 nano-technology |
| Zdroj: | Journal of Materials Science & Technology. 32:402-410 |
| ISSN: | 1005-0302 |
| DOI: | 10.1016/j.jmst.2016.02.009 |
| Popis: | Porous pre-sintered zirconia is subject to white machining during which its elasticity, plasticity and resistance to machining-induced damage determine its machinability and final quality. This study used nanoindentation techniques and the Sakai's series elastic and plastic deformation model to extract the resistance to plastic deformation from the plane strain modulus and the contact hardness for pre-sintered zirconia. The modulus and the resistance to plasticity were used to calculate the relative amount of elasticity and plasticity. The fracture energy and the normalized indentation absorbed energy were used to deconvolute the resistance to machining-induced cracking based on the Sakai–Nowak model. All properties were extracted at a 10 mN peak load and loading rates of 0.1–2 mN/s to determine the loading rate effects on these properties. We found that the resistance to plasticity and the resistance to machining-induced cracking were independent of the loading rate (ANOVA, p > 0.05). The elastic and plastic displacements depended on the loading rate through power laws. This loading rate-dependent deformation behaviour was explained by the maximum shear stress generated underneath the indenter and the indentation energy. The plastic deformation components and the indentation absorbed energy at all loading rates were higher than the elastic deformation components and the elastic strain energy, respectively. Finally, we established the linkage among the pore structure, indentation behaviour and machinability of pre-sintered zirconia. |
| Databáze: | OpenAIRE |
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