Dynamic structures in shock-loaded copper
- Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, Saint Petersburg (Russian Federation)
Shock loading of polycrystalline copper under uniaxial strain conditions at 6.2 divide 7.3 GPa results in nucleating the dissipative structures of 5 divide 25 {mu}m in diameter. Interior of each structure is a network of microshear bands of 100 divide 300 nm spacing. Nucleation of structures occurs at the impact velocity where particle velocity dispersion begins to grow faster than mean particle velocity or when the local strain rate at the mesoscale becomes higher than the macroscopic strain rate. Simultaneously, defect of particle velocity at the plateau of compressive pulse, macrohardness, and spall strength grow in the same manner. Physically, nucleation of dissipative structures is estimated to be initiated under resonance condition between space periods of polarized dislocation structure and driving plastic front.
- OSTI ID:
- 21143624
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 78, Issue 6; Other Information: DOI: 10.1103/PhysRevB.78.064301; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dynamic properties of FeCrMnNi, a High Entropy Alloy
Dynamic properties of FeCrMnNi, a high entropy alloy