Articles you may be interested inOn the residual stress and fracture strength of crystalline silicon wafers Appl. Phys. Lett. 102, 021909 (2013); 10.1063/1.4776706
Effect of surface stress on the asymmetric yield strength of nanowiresShock wave experiments with inclined prisms have been used to determine the compression for shocks propagated along three axes of single-crystal Si. At stresses less than about 200 kbar, the shocks along the (110) and (111) axes exhibited four wave structures. The first three waves were taken to be related to the Hugoniot Elastic Limit and to two succeeding polymorphic phase transitions. Scatter in the magnitude of the HEL along the (100) axis may indicate mixing between the elastic wave and the first phase transition wave.
The dynamic yield strengths for several ceramics were measured under shock-wave compression. The Hugoniot elastic limit (HEL), taken as the amplitude of the observed elastic precursor traveling ahead of the compressional wave, was 154 and 82 kbar for B4C and BeO ceramics, respectively, and ranged from 61 to 134 kbar for several Al2O3 ceramics. These values apply to 6-mm-thick samples; in some cases there were variations with sample thickness. The offset of the Hugoniot from the isotropic compression curve in the stress-volume plane indicates a nonzero yield strength above the HEL for Al2O3. This yield strength is somewhat less than the yield strength at the HEL. The compaction of porous ceramics is found to follow a quadratic variation with stress, full compaction being reached at about four times the HEL.
The Hugoniot elastic limits (HEL) of a high-density aluminum oxide ceramic (Lucalox) and a slightly lower-density ceramic (porosity approximately 4%) were determined to be 112±13 and 83±5 kbar, respectively. Above the HEL, the shock-stress-volume Hugoniot curves for both materials are offset by 40 kbar or more above their hydrostatic-pressure-volume curves. These results indicate that shear stresses with magnitudes of about 30–40 kbar persist in aluminum oxide to shock-pressure levels of at least 300 kbar.
Articles you may be interested inA single quartz crystal to measure dynamic elastic moduli at several ultrasonic frequencies Rev.Dynamic yield strengths, compression data under uniaxial shock-wave loading, and sonic velocities at 1 bar are reported for polycrystalline TiB 2 , SiC, Be 4 B, Be 4 B+8 wt% BeO, Be 2 B, AIBw TiBe 1 2' and ZrBelJ. Hugoniot elastic limits were measured as 86, 80, 74, 77, 65, 87, 53, and 71 kbar, respectively. Evidence of phase transitions was seen for the Be 4 B materials at 500 kbar and for SiC at 240 and 960 kbar. H PBX 9404 (HMX) Pressed TNT J PBX 9205 (RDX)
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