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http://dx.doi.org/10.5228/KSPP.2005.14.9.751

Spring Back in Amorphous Sheet Forming at High Temperature  

Lee Y-S (국민대학교 기계자동차공학부)
Publication Information
Transactions of Materials Processing / v.14, no.9, 2005 , pp. 751-755 More about this Journal
Abstract
This paper is concerned with spring back after sheet forming of bulk amorphous alloys in the super cooled liquid state. The temperature-dependence and strain-rate dependence of Newtonian/non-Newtonian viscosities as well as the stress overshoot/undershoot behavior of amorphous alloys are reflected in the thermo-mechanical Finite Element simulations. Hemispherical deep drawing operations are simulated for various forming conditions such as punch velocity, die comer radius, friction, blank holder force, clearance and initial funning temperature. Here, spring back by an instantaneous elastic unloading was followed by thermal deformation during cooling, and two modes of spring back are examined in detail. It could be concluded that the superior sheet formability of an amorphous alloy can be obtained by taking the proper forming conditions for loading/unloading.
Keywords
Spring Back; Amorphous Alloy; Newtonian/Non-Newtonian; Sheet Forming; Finite Element Method;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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