2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 1: Aifantis Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Bordas S, Estrin Y |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Generation of Fine Grain Layers in the Vicinity of Frictional Interfaces: Theory and Experiment
Sergei Alexandrov1; Robert Goldstein1;1INSTITUTE FOR PROBLEMS IN MECHANICS, Moscow, Russian Federation;
Type of Paper: Regular
Id Paper: 469
Topic: 1
Abstract:
Narrow fine grain layers often are generated in the vicinity of frictional interfaces in metal forming processes. One of the main contributory mechanisms responsible for the generation of such layers is intensive plastic deformation. It is a challenging task to develop an adequate model for describing such material behavior. The approach proposed in the present paper is based on the strain rate intensity factor (SRIF) previously introduced for rigid perfectly plastic materials. This factor is the coefficient of the leading singular term in a series expansion of the equivalent strain rate (quadratic invariant of the strain rate tensor) in the vicinity of maximum friction surfaces. It follows from this expansion that the equivalent strain rate approaches infinity near maximum friction surfaces and that SRIF controls its magnitude within a narrow sub-surface layer. Such theoretical behavior of the equivalent strain rate is in qualitative agreement with the aforementioned experimental facts. To develop a model for the quantitative prediction of the generation of fine grain layers, it is necessary to propose and carry out a special purpose experimental program. The present paper is based on experiment on plane strain extrusion. Standard finite element packages are not capable to calculate SRIF. In the present paper, a numerical approach based on the method of characteristics is developed to find SRIF in plane strain extrusion. A correlation between the magnitude of SRIF and the experimental thickness of the fine grain layer is discussed.
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