The mechanism of ductile fracture in constrained thin silver films

✍ Scribed by M.E. Kassner; T.C. Kennedy; K.K. Schrems

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 681 KB
• Volume: 46
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/s1359-6454(98)00299-7

✦ Synopsis

AbstractÐThe mechanisms of ductile fracture in pure silver under various high-triaxial stresses in constrained thin silver ®lms were investigated. New experiments and analyses have been performed that have both improved and extended the ®ndings of earlier work by the authors. Particular emphasis was placed on investigating ductile fracture by unstable cavity growth. Here, cavities grow without the necessity for continual increase in ¯ow stress and without substantial far-®eld plastic strain. This mechanism was recently described by Huang, Hutchinson and Tvergaard. Improvements in the analysis of unstable cavity growth included direct determination of the stress states for cavity instability with FEA analysis using more accurate determinations of the stress states within the interlayer, the consideration of cavity±cavity interaction, residual stresses and elastic incompatibility stresses across interfaces. Ductile fracture under high-triaxial stresses, associated with low macroscopic strains, appears to be explained by unstable cavity growth.