Creep-fatigue and cyclically enhanced creep mechanisms in aluminium based metal matrix composites

Giugliano, D., Barbera, D., Chen, H., Cho, N.-K. and Yinghua, L. (2019) Creep-fatigue and cyclically enhanced creep mechanisms in aluminium based metal matrix composites. European Journal of Mechanics - A/Solids, 74, pp. 66-80. (doi: 10.1016/j.euromechsol.2018.10.015)

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An aluminium (Al 2024T3) matrix composite reinforced with continuous alumina (Al2O3) fibres is investigated under tensile off-axis constant macro stress and thermal cyclic loading. The micromechanical approach to modelling and three different fibre cross-section geometries have been employed. The effect of creep is included by considering three dwell times at the peak temperature of the thermal loading history. The presence of the hold time gives rise to different sources of failure such as cyclic enhanced creep and creep ratchetting. These failure mechanisms are carefully discussed and assessed. The linear matching method framework has been used for the direct evaluation of the crucial parameters for creep-fatigue crack initiation assessment at the steady cycle. A detailed representation of the steady-state hysteresis loops is provided by using the strain range partitioning and a method for dealing with multiaxiality is reported with regard to the algebraic sign of the Mises-Hencky equivalent stress and strain. All the results obtained have been benchmarked by fully inelastic step-by-step (SBS) analyses. The design of a long fibre metal matrix composite should consider not only the detrimental effect of their dissimilar coefficient of thermal expansion, but also the state of stress at the interface between the matrix and fibre.

Item Type:Articles
Additional Information:The authors gratefully acknowledge the support of the University of Strathclyde, the Royal Society (IE140842), the International Cooperation and Exchange Project NSFC (11511130057) and the National Science Foundation for Distinguished Young Scholars of China (11325211) during the course of this work.
Glasgow Author(s) Enlighten ID:Barbera, Dr Daniele
Authors: Giugliano, D., Barbera, D., Chen, H., Cho, N.-K., and Yinghua, L.
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:European Journal of Mechanics - A/Solids
ISSN (Online):1873-7285
Published Online:25 October 2018
Copyright Holders:Copyright © 2018 Elsevier Masson SAS
First Published:First published in European Journal of Mechanics - A/Solids 74: 66-80
Publisher Policy:Reproduced in accordance with the publisher copyright policy
Data DOI:10.15129/13787d1c-1741-4445-a042-b33e021ba8e5

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