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Mechanical Analysis of Indentation Cracking in Al2O3/ZrO2 Nanostructured Laminated Ceramics

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Residual stress is not the only driving force for indentation cracking in Al2O3/ZrO2 laminated ceramics. An additional driving force is induced by martensitic transformation in the plastic zone beneath the indenter, whereas surface residual compressive stress controls the expansion of surface cracks. Contributions of the transformation driving force and surface residual stress are not considered in the traditional indentation and indentation-strength theory. Therefore, fracture toughness value measured by the traditional methods is usually lower than the practical one in Al2O3/ZrO2 laminated ceramics. When the improved SENB (Single edge notched beam method)—indentation-fracture method from Japanese Industrial Standard (No. JIS R 1607-1990) is used to measure fracture toughness of Al2O3/ZrO2 laminated ceramics, the value is more reliable.
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Document Type: Research Article

Publication date: 01 November 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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