Title

Investigation of Dynamic Fracture Behavior of Additively Manufactured Al-10Si-Mg using High-Speed Synchrotron X-Ray Imaging

Abstract

The dynamic tensile properties of additively manufactured (AM) and cast Al-10Si-Mg alloy were investigated using high-speed synchrotron X-ray imaging coupled with a modified Kolsky bar apparatus. A controlled tensile loading (strain rate ≈ 750 s-1) was applied using the Kolsky bar apparatus and the deformation and fracture behavior were recorded using the high-speed X-ray imaging setup. The synchrotron X-ray computed tomography (CT) and high-speed imaging results worked together to identify the location of the critical flaw and to capture the dynamics of crack propagation. In all experiments, the critical flaw was located on the surface of each specimen. The AM specimens showed significantly higher crack propagation speed, yield strength, ultimate tensile strength, strain hardening coefficient, and yet lower ductility compared to the cast specimens under dynamic tension. Although the strength values were higher for the AM specimens, the critical mode I stress intensity factors were comparable for both specimens. The microstructures of the samples were characterized by CT and scanning electron microcopy. The correlation between the dynamic fracture behavior of the samples and the microstructure of the samples is analyzed and discussed.

Department(s)

Mechanical and Aerospace Engineering

Second Department

Materials Science and Engineering

Research Center/Lab(s)

Intelligent Systems Center

Comments

This work is funded by Honeywell Federal Manufacturing & Technologies (FM&T), National Science Foundation (NSF, CMMI-1562543), University of Missouri Research Board (UMRB) , and Intelligent Systems Center at Missouri S&T.

Keywords and Phrases

Al-10Si-Mg; Fracture; High-speed X-ray imaging; Kolsky bar; Laser powder bed fusion

International Standard Serial Number (ISSN)

2214-7810; 2214-8604

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Elsevier B.V., All rights reserved.

Publication Date

01 Dec 2019

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