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High-Rate Multiaxial Behaviour of Electron Beam Melted Ti-6Al-2Sn-4Zr-2Mo: An Experimental Study Using a Novel Tension-Torsion Hopkinson Bar Apparatus

Yuan Xu^1,*, Govind Gour², Manuela Galati³, Abdollah Saboori³, Antonio Pellegrino⁴

1 School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
2 Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
3 Integrated Additive Manufacturing Center (IAM), Department of Management and Production Engineering, Politecnico di Torino, 10129 Torino, Italy
4 Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, UK

* Corresponding Author: Yuan Xu. Email:

The International Conference on Computational & Experimental Engineering and Sciences 2024, 31(2), 1-1. https://doi.org/10.32604/icces.2024.013220

Abstract

The dynamic behaviour of Ti-6Al-2Sn-4Zr-2Mo additively manufactured by electron beam melting (EBM) is presented in this study considering synchronised tension-torsion loading. A bespoke spilt Hopkinson Tension-Torsion bar is used to generate combined tensile and torsional stress pulses that interact simultaneously with a novel specimen geometry. High-speed digital imaging correlation techniques are employed to assess the high-rate deformation and crack propagation of the specimen. The material's dynamic response was analysed across a spectrum of stress states, including uniaxial tension, shear, and combinations of tension and shear at strain rates ranging between 500 s^-1 and 2000 s^-1. Comparable failure envelopes of EBM and conventionally manufactured Ti-6Al-2Sn-4Zr-2Mo are presented for the first time, in both quasi-static and dynamic conditions. Results show significant strain rate sensitivity and moderate tension-compression asymmetry. Further scanning electron micrography of the failure surfaces of tested samples indicates the influence of manufacturing defects, stress state, and loading rate on deformation and failure mechanism.

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Keywords

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