Is Adiabatic Shear Failure really Adiabatic?
Event details
| Date | 24.04.2012 |
| Hour | 13:15 › 14:15 |
| Speaker | Prof. Daniel Rittel, Technion - Israel Institute of Technology |
| Location | |
| Category | Conferences - Seminars |
Adiabatic shear failure is a dynamic failure mechanism that results from the formation of a localized narrow band in which the shear strain concentrates and reaches very high values. An early and well accepted analysis of ASB formation relies on the competition between strain-hardening and thermal softening, so that when the latter overcomes the former, the material can no longer harden and fails by shear localization. Therefore, the role of thermally induced strain-softening is viewed as central in ASB formation. We propose another approach to the phenomenon, based on the dynamically stored energy of cold work, the latter being identified as a key factor for the onset of shear localization. This energy affects and dictates the microstructural re-arrangements (dynamic recrystallization, twinning) occurring during dynamic deformation. In this talk, we will present experimental results on the evolution of the temperature and the microstructure of the dynamically sheared material, and a model describing its evolution. These results will be discussed to propose another physical explanation to dynamic shear localization as a microstructure-related instability
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Practical information
- General public
- Free
Organizer
- IGM