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Cruciform specimens’ experimental analysis in ultrasonic fatigue testing.

Costa, P., Montalvão, D., Freitas, M., Baxter, R. and Luis, R., 2019. Cruciform specimens’ experimental analysis in ultrasonic fatigue testing. Fatigue and Fracture of Engineering Materials & Structures, 42 (11), 2496-2508.

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DOI: 10.1111/ffe.13041

Abstract

In this work, two special aluminium cruciform specimens are designed and tested in an ultrasonic fatigue machine. They were designed based on Single-Input-Multiple-Output (SIMO) modal analysis to induce in-plane biaxial stress combinations (in-phase T-T and out-of-phase C-T) when at resonance at 20 kHz. The geometries were subjected to both numerical analysis and experimental testing to understand if they can indeed create the intended biaxial state of stresses. Both numerical and experimental results showed an impact of nearby resonant modes of non-interest on the correct functioning of the specimens, especially regarding the T-T specimen where a large deviation from the mode of interest was measured. This means that future work includes re-designing T-T specimens taking into account these mode shapes. Only out-of-phase specimens demonstrated to work properly and tests until failure were conducted. The first failure results showed to be consistent with literature when out-of-phase biaxial stress is applied cyclically.

Item Type:Article
ISSN:8756-758X
Uncontrolled Keywords:Cruciform specimens; Biaxial stresses; axial-axial; Ultrasonic fatigue; VHCF
Group:Faculty of Science & Technology
ID Code:32235
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:13 May 2019 08:54
Last Modified:29 May 2020 01:08

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