Crossover in the dynamics of jerky flow in AlMg polycrystals Conferences

abstract

• AbstractJerky flow in A1‐Mg alloys is investigated through the statistics of the stress drops size, and through a dynamic analysis of the stress vs. time records. At low applied strain rate levels, peaked distributions are associated with chaotic dynamics, while at higher strain rates, the unstable behavior is characterized by power law distributions reminiscent of a critical dynamics. In addition, the bands of localized plastic deformation shift from stationary to propagating. This crossover is discussed in terms of a nonlocal model of jerky flow, with a range of negative strain rate sensitivity and spatial interactions of varying strength.

authors

• Ananthakrishna, G
• Brechet, Yves
• Fressengeas, C
• Kubin, LP
• Lebyodkin, M

status

• published 

publication date

• January 2000

has subject area

• 01 Mathematical Sciences (FoR)
• 09 Engineering (FoR)
• Applied Mathematics (Science Metrix)

published in

• ZAMM Zeitschrift für Angewandte Mathematik und Mechanik  Journal

presented at event

• Annual Meeting of the Society-for-Applied-Mathematics-and-Mechanics (GAMM 99)  Conference

keywords

• Mathematics
• Mathematics, Applied
• Mechanics
• Physical Sciences
• Science & Technology
• TIME-SERIES
• Technology

Digital Object Identifier (DOI)

• 10.1002/zamm.20000801479

start page

• 415

end page

• 416

volume

• 80

issue

• S2