A Numerical Study of the Mechanical Behavior of Silicon Carbide due to Pressure-Induced Phase Transformations During Nanoindentation
- Department of Mechanical Engineering and Engineering Science, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, NC 28223-0001 (United States)
In this paper, the nanoindentation of Drucker-Prager material with negative dilation angles is considered. The motivation behind the study comes from our interest in understanding and modeling pressure-induced phase transformation of silicon carbide (SiC) with the long-term goal being to understand how these phase transformations can be effectively used in material removal operations such as machining. The Drucker-Prager model is considered in order to account for the pressure sensitivity of SiC and the negative dilation angles capture the volume reductions that have been reported to accompany the phase transformations. Since not all Drucker-Prager material parameters can be determined from the available experimental data, a parametric study is carried out by varying the friction and dilation angles. Our studies show that the hydrostatic pressures reach values in excess of the hardness values of the material and the volume reductions are, in general, the largest in the area directly below the maximum pressure region. Based on the studies carried out in this work, the feasibility of applying the Drucker-Prager material with non-associative flow-rule to machining is also discussed.
- OSTI ID:
- 21057343
- Journal Information:
- AIP Conference Proceedings, Vol. 908, Issue 1; Conference: NUMIFORM '07: 9. international conference on numerical methods in industrial forming processes, Porto (Portugal), 17-21 Jun 2007; Other Information: DOI: 10.1063/1.2740968; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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