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Theory of Environmental Effects on Transgranular Fracture

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Book cover Chemistry and Physics of Fracture

Part of the book series: NATO ASI Series ((NSSE,volume 130))

Abstract

We discuss recent theoretical work on the transgranular stress- corrosion cracking of ductile metals. Computer simulations were used to study the behavior of cracks coated with thin solid films in the intrinsically ductile 2D triangular Lennard-Jones Solid. The key parameters studied were the elastic modulus mismatch and lattice parameter misfit between the film and substrate. It was found that elastically hard films could induce the nucleation of secondary brittle cracks in the normally ductile substrate. Films with a lattice parameter smaller than the substrate caused the crack to respond in a cleavage cracking mode, whereas films with a larger lattice parameter resulted in dislocation injection into the substrate. The concepts of film-induced cleavage and dynamic embrittlement are discussed. Molecular dynamic simulations were also used to study crack dynamics in the 2D triangular Johnson solid. Additionally we also present analytical calculations which explore the effects of thin film formation at crack tips on fracture. The parameters studied included elastic modulus mismatch, lattice parameter misfit and coherency. Suitable combinations of these parameters lead to film-induced micro-cleavage in ductile substrates. Finally crack dynamics are discussed and an estimation of film-induced micro-cleavage distances is presented.

ArticleNote

This research was performed under the auspices of the U.S. Department of Energy, Division of Materials Sciences, Office of Basic Energy Sciences under Contract No. DE-AC02-76CH00016.

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Author information

Authors and Affiliations

  1. Brookhaven National Laboratory, Upton, New York, USA, 11973

    K. Sieradzki

Authors
  1. K. Sieradzki
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Editor information

Editors and Affiliations

  1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Room 8-202, 02139, Cambridge, MA, USA

    R. M. Latanision

  2. Materials Science and Technology Department, Battelle Northwest Laboratories, P.O. Box 999, 99352, Richland, WA, USA

    R. H. Jones

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© 1987 Martinus Nijhoff Publishers, Dordrecht

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Sieradzki, K. (1987). Theory of Environmental Effects on Transgranular Fracture. In: Latanision, R.M., Jones, R.H. (eds) Chemistry and Physics of Fracture. NATO ASI Series, vol 130. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3665-2_13

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  • DOI: https://doi.org/10.1007/978-94-009-3665-2_13

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-8140-5

  • Online ISBN: 978-94-009-3665-2

  • eBook Packages: Springer Book Archive

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