期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 48, 期 4, 页码 709-734出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0022-5096(99)00050-2
关键词
buckling; crack propagation and arrest; fracture toughness; coatings; films; finite elements; stability and bifurcation
The influence of prototypical imperfections on the nucleation and propagation stages of delamination of compressed thin films has been analyzed. Energy release rates for separations that develop from imperfections have been calculated, These demonstrate two characteristic quantities: a peak that governs nucleation and a minimum that controls propagation and failure. These quantities lead to two separate criteria that both need to be satisfied to cause failure. They involve a critical film thickness for nucleation and a critical imperfection wavelength for buckling. Implications for the avoidance of failure are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.
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