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An Investigation on Collapse Behavior of Shear Localization in Elasto- Thermo- Viscoplastic Materials  

Kim, Hyun-Gyu (Department of Mechanical Engineering, Seoul National University of Technology)
Im, Se-Young (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Journal of Mechanical Science and Technology / v.20, no.12, 2006 , pp. 2178-2188 More about this Journal
Abstract
The stress collapse in the formation of shear bands in elasto-thermo-viscoplatic materials is systematically studied within the framework of one-dimensional formulation via analytical and numerical methods. The elastic energy released in a domain is found to play an important role in the collapse behavior of shear localization. A non-dimensional parameter named the stability indicator is introduced to characterize the collapse behavior, with approximate forms of the incremental governing equations. The stability indicator offers useful information regarding the degree of severity of an abrupt change of deformations during the stress collapse. Numerical experiments are carried out to verify the stability indicator by varying material properties.
Keywords
Shear Localization; Shear Band; Instability; Stress Collapse; Elastic Unloading;
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