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For specific applications such as for radioactive materials, indentation techniques are still the most suitable means of obtaining information on fracture properties. Progress in theory, and extensive testing and calibration with other techniques, have largely increased the acceptability and applicability of indentation techniques. These are now applied to a large range of materials including, for example, transformation-toughened ZrO(2) and bioceramics. Besides measuring fracture toughness, indentation creep is increasingly investigated as a convenient means to obtain information on mechanical behaviour at elevated temperature. A breakthrough in instrumentation and accuracy has been achieved with the commercial development of different nanoindenters capable of measuring hardness, modulus, creep and stress relaxation with a displacement resolution of 0.04 to 3 nm, a force resolution of 75 to 500 nN and an accuracy of indent placement of +/- 200 nm, depending on the producer. Typical examples of recent work are given to indicate the trend in the recent past and at present. Emphasis is placed on difficulties and error sources in performing experiments and in evaluating experimental data.

Additional information

Authors: MATZKE H-J, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: International Symposium on Advanced Ceramics ISAC 90, Bombay (IN), Nov. 26-30, 1990
Availability: Available from (1) as Paper EN 35988 ORA
Record Number: 199110427 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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