TY  - EJOU
AU  - Xu, Yuan 
AU  - Gour, Govind 
AU  - Galati, Manuela 
AU  - Saboori, Abdollah 
AU  - Pellegrino, Antonio 

TI  - High-Rate Multiaxial Behaviour of Electron Beam Melted Ti-6Al-2Sn-4Zr-2Mo: An Experimental Study Using a Novel Tension-Torsion Hopkinson Bar Apparatus
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2024
VL  - 31
IS  - 2
SN  - 1933-2815

AB  - 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<sup>-1</sup> and 2000 s<sup>-1</sup>. 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.
KW  - Electron beam melting (EBM); Ti-6Al-2Sn-4Zr-2Mo (Ti-6242); tension-torsion; Hopkinson bar; rate dependence

DO  - 10.32604/icces.2024.013220