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Mechanical Behavior of a Hot-Pressed Aluminum Nitride Under Uniaxial Compression

Subhash, G. and Ravichandran, G. (1998) Mechanical Behavior of a Hot-Pressed Aluminum Nitride Under Uniaxial Compression. Journal of Materials Science, 33 (7). pp. 1933-1939. ISSN 0022-2461. doi:10.1023/A:1004325926287.

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Failure strength of a hot pressed aluminum nitride (AlN) is measured as a function of strain rate under uniaxial compression. At low strain rates (10^(-6)–10^(-2)s^(-1)), the material is found to exhibit a weak strain rate sensitivity and at higher strain rates (10^2–10^3s^(-1)), a strongly strain rate sensitive behaviour is observed. The quasi-static failure strength is found to be around 2.81 GPa and it increases to 5.25 GPa at a strain rate of 2200 s^(-1). During high strain rate testing, the specimen fractured into columnar fragments by axial splitting. Microscopic examination of the fractured surfaces revealed a typical brittle fracture with a combination of inter and intragranular failure modes. Based on the experimental results and microscopic observations, a micromechanical model has been developed to predict the constitutive behaviour of these ceramics under uniaxial compression. The model predictions of failure strength are shown to to be in agreement with the experimental observations.

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Ravichandran, G.0000-0002-2912-0001
Additional Information:© 1998 Chapman & Hall. Received 7 May 1996 and accepted 7 January 1997. The support provided by the National Science Foundation (Grant No. CMS-9157846) through a Presidential Young Investigator award to G. Ravichandran and the matching funds provided by the Dow Chemical Company for this research is gratefully acknowledged. The authors would like to thank Drs Michael El-Raheb, William Rafaniello and Kwanho Yang of Dow Chemical Co., Midland, MI, for many useful discussions during this investigation.
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Dow Chemical CompanyUNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20150226-142100033
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55271
Deposited By: Cheryl Gause
Deposited On:03 Mar 2015 00:25
Last Modified:10 Nov 2021 20:44

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