@inproceedings{f634b6090ce34d07a5de3fdc6e6b43d3,
title = "The Development of Split Hopkinson Tension-Torsion Bar for the Understanding of Complex Stress States at High Rate",
abstract = "A novel Tension-Torsion Split Hopkinson Bar apparatus conceived to achieve an arbitrary combination of tension and shear at high strain rates in a single loading event is proposed. The apparatus allows for the population of the failure and yield surfaces with experimental data and, in turn, for a better understanding of materials during deformation and failure. The proposed loading system enables combined direct-shear stress pulses of duration exceeding one millisecond to be applied to the sample under consideration; hence, allowing for the achievement of a wider range of strain rates than what currently exists in the open literature. Force, torque, and velocity histories at the interface between bars and specimen are measured via a data analysis procedure based on the method of characteristics and on D{\textquoteright}Alambert{\textquoteright}s solution of wave equations. Additional velocity measurements are conducted by means of photon Doppler velocimetry. The capability of the apparatus is validated by means of bar-attached tests and will be further demonstrated via experiments on commercially available pure titanium. The rate-dependent behavior of the material subjected to complex stress states will be analyzed and reported. The failure surface of specimens subjected to a prescribed combination of tension and torsion will be assessed by means of optical profilometry and scanning electron microscope.",
keywords = "Combined tensile-shear loading, Failure surface, Photon Doppler velocimetry, Split Hopkinson bar, Tension-torsion",
author = "Yuan Xu and Lukasz Farbaniec and Clive Siviour and Daniel Eakins and Antonio Pellegrino",
year = "2021",
month = apr,
day = "9",
doi = "10.1007/978-3-030-59947-8_16",
language = "English",
isbn = "9783030599461",
series = "Conference Proceedings of the Society for Experimental Mechanics Series",
publisher = "Springer, Cham",
pages = "89--93",
editor = "Leslie Lamberson and Steven Mates and Veronica Eliasson",
booktitle = "Dynamic Behavior of Materials - Proceedings of the 2020 Annual Conference on Experimental and Applied Mechanics",
note = "SEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2020 ; Conference date: 14-09-2020 Through 17-09-2020",
}