Volume 2, 2009DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
|Page(s)||955 - 961|
|Published online||15 September 2009|
A new perspective on adiabatic shear failureD. Rittel
Faculty of Mechanical Engineering, Technion, 32000 Haifa, Israel
Published online: 15 September 2009
Adiabatic shear failure is commonly considered to be induced by thermal softening, for which a critical strain describes the onset of failure. This paper revisits this concept on the basis of experimental evidence showing that the homogeneous temperature rise prior to localization often remains quite modest. Instead, we consider the dynamically stored energy of cold work as a key factor in the process, whose role is to trigger dynamic recrystallization (DRX) at an early deformation stage where thermal effects are negligible. DRX, which precedes the localization instead of being its result, causes local softening of the material. The dynamically recrystallized enclaves are believed to grow and coalesce into a fully developed adiabatic shear band.
© EDP Sciences 2009