Fabrication of artificial defects to study internal fatigue crack propagation in metals

SCRIPTA MATERIALIA

卷:171

Article

Junet, Arnaud¹  Messager, Alexandre²  Boulnat, Xavier¹  Weck, Arnaud^3,4,5  Boller, Elodie⁶  Helfen, Lukas^6,7  Buffiere, Jean-Yves¹ 

[1] Univ Lyon, INSA Lyon, MATEIS, CNRS,UMR 5510, F-69621 Villeurbanne, France

[2] Univ Bordeaux, CNRS, Arts & Metiers ParisTech, I2 M Bordeaux,Esplanade Arts & Metiers, F-33405 Talence, France

[3] Univ Ottawa, Dept Mech Engn, 150 Louis Pasteur, Ottawa, ON K1N 6N5, Canada

[4] Univ Ottawa, Ctr Res Photon, 25 Templeton, Ottawa, ON K1N 6N5, Canada

[5] Univ Ottawa, Dept Phys, 150 Louis Pasteur, Ottawa, ON K1N 6N5, Canada

[6] ESRF, 71 Ave Martyrs,BP 220, F-38043 Grenoble 9, France

[7] Karlsruhe Inst Technol, Inst Photon Sci & Synchrotron Radiat, POB 3640, D-76021 Karlsruhe, Germany

关键词: Internal fatigue cracks;    Three-dimensional tomography;    Synchrotron radiation;    Titanium alloys;    Spark plasma sintering;   

DOI  :  10.1016/j.scriptamat.2019.05.018

来源: Elsevier

【 摘 要 】

Fatigue specimens designed with controlled internal defects were obtained by diffusion bonding of Ti-6Al-4V sheets containing femtosecond laser drilled notches. Crack initiation from the internal defect occurred systematically. The cracks were characterised by in situ synchrotron X-ray tomography. Propagation rates are lower than those of surface cracks of comparable sizes in the same material and fall between experimental data obtained for fatigue cracks propagating in air and in vacuum. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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