کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
800748 1467499 2011 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Concomitant wrinkling and buckle-delamination of elastic thin films on compliant substrates
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Concomitant wrinkling and buckle-delamination of elastic thin films on compliant substrates
چکیده انگلیسی

Compressing a thin elastic film attached to a thick compliant substrate can lead to buckling instability. Two commonly observed buckling modes, buckle-delamination and wrinkling, have each been analyzed separately in previous studies. Recent experiments have observed that the two modes can co-exist and co-evolve. In this paper, by analytical and finite element methods, we present a study on concomitant wrinkling and buckle-delamination for an elastic film on a highly compliant substrate. First, without delamination, we present an analytical solution for wrinkling that takes into account the effect of Poisson’s ratio of the substrate. In comparison with a nonlinear finite element analysis, an approximate formula is derived to estimate the normal traction at the interface and to predict initiation of wrinkle-induced delamination. Next, with a pre-existing delamination crack, the critical strain for the onset of buckling instability is predicted by finite element eigenvalue analysis. For an intermediate delamination size, a mixed buckling mode is predicted with the critical compressive strain lower than previous solutions for both wrinkling and buckle-delamination. Post-buckling analyses show a significant shear-lag effect with an effective load transfer length three orders of magnitude greater than the film thickness. Finally, concomitant wrinkling and buckle-delamination is simulated to illustrate the interaction between the two buckling modes, and the results are discussed in view of failure mechanisms and applications in thin film metrology.


► An approximate formula is developed to predict initiation of wrinkle-induced delamination.
► The effect of pre-existing delamination crack on onset of buckling instability is predicted.
► A mixed buckling mode is predicted with the critical strain lower than previous solutions.
► Numerical simulations demonstrate coexistence of the two primary buckling modes.
► Potential failure criteria for hybrid thin film materials are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanics of Materials - Volume 43, Issue 11, November 2011, Pages 627–642
نویسندگان
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