Two-dimensional inter-layer debonding in deposited multi-layers

Beuth, J L; Narayan, S H

Title: Two-dimensional inter-layer debonding in deposited multi-layers

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Abstract

Two-dimensional problems of residual stress-driven inter-layer debonding or delamination in successively deposited isotropic multi-layers are studied, with direct applications to the modeling of delamination in multi-layered coatings and films. Planar and axisymmetric configurations of a delamination crack extending from a free edge are considered. The term successively deposited is used to designate that each layer experiences a free thermal contraction relative to the layers below it. Results for energy release rates as a function of crack length are presented from fracture mechanics models of planar and axisymmetric multi-layer geometries. In planar problems, energy release rates reach a constant value for crack lengths greater than one or two debond thicknesses and maintain this value until the multi-layer is almost completely debonded. In axisymmetric problems, energy release rates increase steadily with increasing crack length, reaching a maximum just before the multi-layer separates into two pieces. These observed energy release rate behaviors are explained qualitatively. Methods are outlined for quantitatively predicting the steady-state energy release rate for planar debonding problems. Methods are also outlined for determining a conservative upper bound for the maximum energy release rate for an axisymmetrically extending delamination crack. Both methods are based on potential energy calculations from a residualmore »« less

Authors:

Beuth, J L; Narayan, S H ^[1]

Carnegie Mellon Univ., Pittsburgh, PA (United States)

Publication Date:: Tue Dec 31 00:00:00 EST 1996

OSTI Identifier:: 441511

Report Number(s):: CONF-960214-
TRN: 96:006556-0044

Resource Type:: Conference

Resource Relation:: Conference: 19. annual meeting of the Adhesion Society, Inc, Myrtle Beach, SC (United States), 18-21 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 19th annual meeting of the Adhesion Society; Ward, T.C. [ed.]; PB: 567 p.

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; FILMS; BONDING; FAILURES; LAYERS; COATINGS

Citation Formats


                    Beuth, J L, and Narayan, S H. Two-dimensional inter-layer debonding in deposited multi-layers.  United States: N. p., 1996. 
        Web.

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                    Beuth, J L, & Narayan, S H. Two-dimensional inter-layer debonding in deposited multi-layers.  United States.

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                    Beuth, J L, and Narayan, S H. 1996.  
        "Two-dimensional inter-layer debonding in deposited multi-layers".  United States.

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@article{osti_441511,

  title        = {Two-dimensional inter-layer debonding in deposited multi-layers},

  author       = {Beuth, J L and Narayan, S H},

  abstractNote = {Two-dimensional problems of residual stress-driven inter-layer debonding or delamination in successively deposited isotropic multi-layers are studied, with direct applications to the modeling of delamination in multi-layered coatings and films. Planar and axisymmetric configurations of a delamination crack extending from a free edge are considered. The term successively deposited is used to designate that each layer experiences a free thermal contraction relative to the layers below it. Results for energy release rates as a function of crack length are presented from fracture mechanics models of planar and axisymmetric multi-layer geometries. In planar problems, energy release rates reach a constant value for crack lengths greater than one or two debond thicknesses and maintain this value until the multi-layer is almost completely debonded. In axisymmetric problems, energy release rates increase steadily with increasing crack length, reaching a maximum just before the multi-layer separates into two pieces. These observed energy release rate behaviors are explained qualitatively. Methods are outlined for quantitatively predicting the steady-state energy release rate for planar debonding problems. Methods are also outlined for determining a conservative upper bound for the maximum energy release rate for an axisymmetrically extending delamination crack. Both methods are based on potential energy calculations from a residual stress model for an uncracked multi-layer. These easily-calculated energy release rate quantities for planar and axisymmetric delamination problems can be used to guide the specification of layer thicknesses, stacking sequences and other characteristics of multi-layered coatings and films.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/441511},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Dec 31 00:00:00 EST 1996},

  month        = {Tue Dec 31 00:00:00 EST 1996}

}

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