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The Mechanism of Ductile Fracture in Constrained Thin Films

Published online by Cambridge University Press:  15 February 2011

M.E. Kassner ,
T.C Kennedy  and
K.K. Schrems
M.E. Kassner
Affiliation:
Department of Mechanical Engineering, Oregon State University, Corvallis, OR 97331USA
T.C Kennedy
Affiliation:
Department of Mechanical Engineering, Oregon State University, Corvallis, OR 97331USA
K.K. Schrems
Affiliation:
Department of Mechanical Engineering, Oregon State University, Corvallis, OR 97331USA
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Abstract

The mechanism of low macroscopic-plastic-strain, ductile fractures under various high triaxial stresses in constrained thin silver films was investigated. Particular emphasis was placed on investigating ductile fracture by unstable cavity growth. The various multi-axial loads to failure were experimentally measured. FEA analysis was used to determine the corresponding high triaxial stress-states within the interlayer, also considering cavity-cavity interaction, residual stresses and elastic incompatibility stresses across interfaces. These were compared to the stresses required for cavity instability. Ductile fracture under high triaxial stresses, associated with low macroscopic strains, appears to be explained by unstable cavity growth, where cavity growth may occur without large macroscopic (e.g., < 0.05) plastic strains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 539: Symposium M – Fracture & Ductile vs. Brittle Behavior - Theory, Modelling… , 1998 , 263
Copyright
Copyright © Materials Research Society 1999

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