Title

Enhanced fatigue characteristics of a topology-optimized porous titanium structure produced by selective laser melting

Author Identifier

L. C. Zhang
Orcid: https://orcid.org/0000-0003-0661-2051

Document Type

Journal Article

Publication Title

Additive Manufacturing

Publisher

Elsevier

School

School of Engineering

Funders

Australian Research Council.

Further funding information available at: https://doi.org/10.1016/j.addma.2020.101060

Grant Number

ARC Number : DP170104307

Comments

Liu, Y. J., Ren, D. C., Li, S. J., Wang, H., Zhang, L. C., & Sercombe, T. B. (2020). Enhanced fatigue characteristics of a topology-optimized porous titanium structure produced by selective laser melting. Additive Manufacturing, 32, Article 101060. https://doi.org/10.1016/j.addma.2020.101060

Abstract

The fatigue properties are critical considerations for porous structures, and most of the existing porous materials have unsatisfactory performances due to a lack of structural optimization. This work shows that a topology-optimized structure fabricated by selective laser melting using commercial-purity titanium (CP-Ti) exhibits excellent fatigue properties with an ultra-high normalized fatigue life of ∼0.65 at 106 cycles and at a low density of 1.3 g/cm3. The main factors affecting fatigue, i.e., material properties and a porous structure were studied. Both the factors can affect the fatigue crack initiation time, thereby affecting the fatigue life. Because of twinning that occurred during the fatigue process, the porous CP-Ti samples exhibit a high plasticity. In addition, the fatigue crack propagation rate is significantly reduced because of the high plasticity of the CP-Ti material and the occurrence of fatigue crack deflection.

DOI

10.1016/j.addma.2020.101060

Share

 
COinS