The creeping motion of thin sheet metal damaged by elliptical cutouts ('cavities') is observed experimentally and compared to a parallel analytical simulation. The metal matrix satisfies a power-law strain-rate sensitivity behavior and the overall heterogeneous sheet (the 'structure') is subjected to a constant bi-axial stretch produced by a newly suggested bulging test. The tests are conducted at superplastic conditions with Tin-Lead sheets (50-50 Pb-Sn) and last until rupture occurs. The computational simulation of the damage evolution (in particular, the expansion and rotation of each cavity), makes use of a Green-function solution for the motion of a single isolated cavity in an infinite viscoplastic continuum. The extension of the solution to a multi-cavity continuum is performed in an approximate fashion.
Damage evolution in sheet metal forming
Die Schadensentwicklung beim Umformen von Metallblech
1994
7 Seiten, 9 Bilder, 18 Quellen
Aufsatz (Konferenz)
Englisch
Damage Evolution in Sheet Metal Forming
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