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International Journal of Forming Processes
1292-7775
Publication suspended
 

 ARTICLE VOL 8/SI - 2005  - pp.283-298
TITLE
Experimental Verification of the PathIndependence of Forming Limit Stresses

ABSTRACT
The forming limit of a 5 000 series aluminum alloy tube subjected to combined axial loads and internal pressure is studied experimentally for linear and combined stress paths, using a servo-controlled tension-internal pressure testing machine. The testing machine is capable of assigning arbitrary stress paths to a tubular specimen using an electrical, closed-loop control system. The tubular material used is the same as that in our previous study (Kuwabara et al., 2005). Forming limit curves are plotted in strain space, as well as in stress space. The former gives a conventional Forming Limit Curve (FLC) whereas the latter gives a Forming Limit Stress Curve (FLSC). It is found that FLCs depend significantly on the strain/stress paths, but the stress states at the forming limit lie close to a single curve in the principal stress space for a variety of stress paths; the path-dependence of the FLC vanishes when viewed in stress space. We have confirmed that this effect is not a result of the saturation tendency of the stress-strain curves of the present material at high strain levels. The FLSC concept is therefore valuable for predicting the failure of metal tubes and sheets in plane stress states, particularly in multistage forming.


AUTEUR(S)
Kengo YOSHIDA, Toshihiko KUWABARA, Kouji NARIHARA, Susumu TAKAHASHI

KEYWORDS
Forming Limit Strain, Forming Limit Stress, Aluminium Alloy, Yield Function, Biaxial Stress Test.

LANGUE DE L'ARTICLE
Anglais

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