Loughborough University
Browse
Harvey_Manuscript_EFM_Revision2.pdf (2.2 MB)

Room temperature spallation of α-alumina films grown by oxidation

Download (2.2 MB)
journal contribution
posted on 2017-03-23, 14:03 authored by Simon WangSimon Wang, Christopher HarveyChristopher Harvey, Bin Wang
Tolpygo and Clarke (2000) presented an excellent experimental study on the room temperature circular spallation of α-alumina films grown by oxidation on Fe-Cr-Al alloy. Their observations are remarkable and thought-provoking and are worthy of mechanical interpretation. The present work hypothesizes that pockets of energy concentration (PECs) exist due to dynamic and non-uniform plastic relaxation or creep in the film and Fe-Cr-Al alloy substrate during cooling. PECs may be the driving energy for room temperature spallation failure. Based on this hypothesis, an analytical mechanical model is developed in this work to predict the spallation behavior, including the separation nucleation, stable and unstable growth, and final spallation and kinking off. The predictions from the developed model are compared against experimental results and excellent agreement is observed. The work reveals a completely new failure mechanism of thin layer materials.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Engineering Fracture Mechanics

Citation

WANG, S., HARVEY, C.M. and WANG, B., 2017. Room temperature spallation of α-alumina films grown by oxidation. Engineering Fracture Mechanics, 178, pp.401–415.

Publisher

© Elsevier

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

2017-03-02

Publication date

2017

Notes

This paper was published in the journal Engineering Fracture Mechanics and the definitive published version is available at https://doi.org/10.1016/j.engfracmech.2017.03.002.

ISSN

1873-7315

Language

  • en

Usage metrics

    Loughborough Publications

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC