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Research Papers

A Chemomechanical Model for Stress Evolution and Distribution in the Viscoplastic Oxide Scale During Oxidation

[+] Author and Article Information
Hailong Wang

State Key Laboratory for Strength
and Vibration of Mechanical Structures,
School of Aerospace,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: wang_hl@stu.xjtu.edu.cn

Shengping Shen

State Key Laboratory for Strength
and Vibration of Mechanical Structures,
School of Aerospace,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: sshen@mail.xjtu.edu.cn

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received January 21, 2016; final manuscript received February 13, 2016; published online March 10, 2016. Editor: Yonggang Huang.

J. Appl. Mech 83(5), 051008 (Mar 10, 2016) (6 pages) Paper No: JAM-16-1039; doi: 10.1115/1.4032796 History: Received January 21, 2016; Revised February 13, 2016

Using the location-dependent growth strain, a chemomechanical model is developed for the analysis of the stress evolution and distribution in the viscoplastic oxide scale during high-temperature oxidation. The problem of oxidizing a semi-infinite substrate is formulated and solved. The numerical results reveal high compressive stress and significant stress gradient. The maximum stress is at the oxide/substrate interface and the minimum stress at the oxygen/oxide interface in short oxidation time, while the maximum stress is no longer at the oxide/substrate interface in long oxidation time. The stress evolutions at different locations are also presented. The predicted results agree well with the experimental data.

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Figures

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Fig. 1

Schematic of the oxygen/oxide/substrate system

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Fig. 2

Oxide scale thickness with time

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Fig. 3

Oxide scale thickness with the square root of time

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Fig. 4

Oxygen distribution along the oxide scale thickness

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Fig. 5

Zirconium distribution along the oxide scale thickness

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Fig. 6

Compressive stress distribution along the oxide scale thickness

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Fig. 7

Compressive stress evolution with time at different locations in the oxide scale

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Fig. 8

Comparison of predicted average stress with experimental data [41] in the oxide scale

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Fig. 9

Average stress evolution with time for different viscoplastic coefficient

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