To read this content please select one of the options below:

Fatigue limit prediction of A356-T6 cast aluminum alloys with different defect sizes sampled from an actual large-scale component

Yoshihiko Uematsu (Department of Mechanical Engineering, Gifu Daigaku, Gifu, Japan)
Toshifumi Kakiuchi (Department of Mechanical Engineering, Gifu Daigaku, Gifu, Japan)
Akiko Tajiri (Murata Machinery Ltd., Inuyama, Japan)
Masaki Nakajima (Toyota College, National Institute of Technology, Toyota, Japan)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 4 December 2017

222

Abstract

Purpose

The purpose of this paper is the proposal of fatigue-life-prediction curve for cast aluminum alloy A356-T6 with different casting defect sizes.

Design/methodology/approach

Four kinds of A356-T6 fatigue specimens were sampled from the actual large-scale cast component, where the cooling rates were different. In addition, three kinds of A356 were casted under different casting conditions to simulate different defect sizes in the actual component. Subsequently, rotating bending fatigue tests were conducted using those samples. The maximum sizes of casting defects were quantitatively evaluated through microstructural observation and extreme value statistics. The fatigue limits of all samples were predicted using hardness and defect sizes based on modified Murakami’s equation.

Findings

The modified equation for fatigue limit prediction in A356-T6 was proposed. Fatigue limits were successfully predicted using the proposed equation.

Originality/value

Fatigue limit prediction method using hardness and maximum defect size was limited to steels. This paper proposed the modified method for A356-T6 aluminum alloy with lower elastic modulus. The method was valid for A356-T6 with different defect sizes.

Keywords

Citation

Uematsu, Y., Kakiuchi, T., Tajiri, A. and Nakajima, M. (2017), "Fatigue limit prediction of A356-T6 cast aluminum alloys with different defect sizes sampled from an actual large-scale component", International Journal of Structural Integrity, Vol. 8 No. 6, pp. 617-631. https://doi.org/10.1108/IJSI-12-2016-0038

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

Related articles