期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 59, 期 5, 页码 1076-1093出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2011.02.003
关键词
AlN; Dynamic; Confining stress; Failure envelop; Deformation mechanism
资金
- Army Research Laboratory under ARMAC-RTP [DAAD19-01-2-0003, W911NF-06-2-0006]
Uniaxial quasi-static compression, uniaxial dynamic compression and confined dynamic compression experiments were performed to characterize the failure of Aluminum Nitride (AlN) using a servo hydraulic machine and a modified Kolsky bar set-up respectively. High-speed digital cameras are used to visualize the failure processes. A summary of the available experimental results, including that in the literature, shows that the compressive strength of the AIN is sensitive to strain rate in the range from 10(-3) to 10(3) s(-1), that the deviatoric strength of AIN is linearly dependent on pressure at low pressures and nearly independent of pressure above a transitional pressure (about 2 GPa). TEM characterization of fragments obtained after dynamic loading is used to characterize the deformation mechanisms in the AIN for varying confinement. The transition in the pressure dependent behavior is shown to be the result of a change of deformation mechanism. Classical wing crack micromechanics is used to predict the transition in the deformation mechanism, and to explain the observed behavior at low pressure. (C) 2011 Elsevier Ltd. All rights reserved.
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