Plastic deformation and microstructural transformation of metals in shock waves
The authors present a model for plastic deformation of a metal in a shock wave in which they distinguish the mechanisms for the defectstructure transformation in the EP, the plastic loading wave, and the unloading one (i.e., they incorporate the contributions from the various mechanisms to the various parts of the wave profile), and they also present a simulation of the wave-front evolution on the basis of relaxation. The model incorporates the possibility that the dislocation density may be increased by heterogeneous generation and has been used in calculating the propagation of planar shock waves of intensity up to 10GPa in aluminum alloys Al-1060, Al-6061-T6 and D-16. The model is based on a relationship defining the rate of planar shear strain in terms of the average values for the microscopic parameters. Results show that the EP damping is determined mainly by dislocation generation. The decisive part in the production and evoluation of the plastic-wave front is played by dislocation multiplication. The structure of the unloading waves is essentially related to the accumulated plastic strains and to the level of the oriented residual stresses.
- OSTI ID:
- 5111332
- Journal Information:
- Combust., Explos. Shock Waves (Engl. Transl.); (United States), Journal Name: Combust., Explos. Shock Waves (Engl. Transl.); (United States) Vol. 19:5; ISSN CESWA
- Country of Publication:
- United States
- Language:
- English
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