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Title: Room temperature spallation of α-alumina films grown by oxidation
Authors: Wang, Simon
Harvey, Christopher M.
Wang, Bin
Keywords: Alumina film
Energy release rate
Pockets of energy concentration
Residual stress
Spallation
Issue Date: 2017
Publisher: © Elsevier
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.
Abstract: 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.
Description: This paper is in closed access until 14th Mar 2018.
Version: Accepted for publication
DOI: 10.1016/j.engfracmech.2017.03.002
URI: https://dspace.lboro.ac.uk/2134/24506
Publisher Link: http://dx.doi.org/10.1016/j.engfracmech.2017.03.002
ISSN: 1873-7315
Appears in Collections:Closed Access (Aeronautical and Automotive Engineering)

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