The Development of Split Hopkinson Tension-Torsion Bar for the Understanding of Complex Stress States at High Rate

Xu, Yongbin; Farbaniec, Lukasz; Siviour, Clive R.; Eakins, Daniel; Pellegrino, Antonio

doi:10.1007/978-3-030-59947-8_16

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…1a-b. More details about the development of the TTHB system can be found in Xu et al (2020) [17]. A schematic representation of a single PDV channel is shown in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

Application of the Photon Doppler Velocimetry (PDV) technique in tension-torsion Hopkinson bar experiments

Farbaniec

Zhou

et al. 2021

EPJ Web Conf.

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The Photon Doppler Velocimetry (PDV) technique is used to capture simultaneously propagating elastic waves of longitudinal and shear nature in a Tension-Torsion Hopkinson Bar (TTHB) apparatus. The system uses a pair of probes per velocity measurement, which were taken on the opposite sides of the TTHB bar with a laser irradiated spot size of ~35 µm. The collected data were compared to the measurements obtained from the conventional strain gauge technique, and were in good agreement. The PDV method was effective in separating longitudinal and rotation signals even when they were superimposed on each other at the gauge location. This approach is also shown to be effective in detecting and accounting for the presence of bending waves in the TTHB bars.

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“…1a-b. More details about the development of the TTHB system can be found in Xu et al (2020) [17]. A schematic representation of a single PDV channel is shown in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

Application of the Photon Doppler Velocimetry (PDV) technique in tension-torsion Hopkinson bar experiments

Farbaniec

Zhou

et al. 2021

EPJ Web Conf.

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“…Details of the wave propagation and interaction with the specimen, as well as signal interpretation in a typical TTHB experiment, can be found in [41]. The mechanical design of the pre-loads in tension and torsion is elaborated in [42].…”

Section: Working Principlementioning

confidence: 99%

Optimal Design, Development and Experimental Analysis of a Tension–Torsion Hopkinson Bar for the Understanding of Complex Impact Loading Scenarios

Zhou

Farbaniec

et al. 2023

Exp Mech

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Background Advanced testing methodologies and measurement techniques to identify complex deformation and failure at high strain rates have drawn increasing attention in recent years. Objective The objective of the current study is the development of a novel combined tension–torsion split Hopkinson bar (TTHB) conceived to generate a combination of tensile and torsional stress waves in a single loading case, and to measure material data representative of real case impact scenarios. Methods An energy store and release mechanism was employed to generate both the longitudinal and shear waves via the rapid release of a bespoke clamp assembly. A parametric study of the material and geometry of the clamp was implemented via numerical simulations to optimise critical aspects of the wave generation. Thin-walled tube specimens made of two metallic materials were utilised to examine the capability of the developed TTHB system by comparing the experimental measurements with those obtained from conventional split Hopkinson tension and torsion bars. Results The experimental results demonstrate that the synchronisation of the longitudinal and torsional waves was achieved within 15 microseconds. Different wave rise time were obtained via the controlled release of the clamp using fracture pins of various materials. The analysis indicates that the developed TTHB is capable of characterising the dynamic behaviour of materials under tension, torsion, as well as under a wide range of complex stress states. Conclusions The presented apparatus, testing and analysis methods allow for the direct population of the dynamic failure stress envelopes of engineering materials and for the accurate evaluation of existing and novel constitutive models.

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“…a transmitted bar, with the specimen sandwiched in between, a rapid release clamp station, a tensile and torsional loading unit, and a data acquisition system. The working principle and the technical specification of the TTHB, as well as data interpretation of a typical TTHB experiment, are elaborated in previous work [40][41][42][43] and is not detailed here.…”

Section: Tablementioning

confidence: 99%

Effects of Build Orientation and Strain Rate on the Tensile-Shear Behaviour of Polyamide-12 Manufactured Via Laser Powder Bed Fusion

Quino

Ramakrishnan

et al. 2023

Preprint

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The Development of Split Hopkinson Tension-Torsion Bar for the Understanding of Complex Stress States at High Rate

Cited by 8 publications

References 8 publications

Application of the Photon Doppler Velocimetry (PDV) technique in tension-torsion Hopkinson bar experiments

Application of the Photon Doppler Velocimetry (PDV) technique in tension-torsion Hopkinson bar experiments

Optimal Design, Development and Experimental Analysis of a Tension–Torsion Hopkinson Bar for the Understanding of Complex Impact Loading Scenarios

Effects of Build Orientation and Strain Rate on the Tensile-Shear Behaviour of Polyamide-12 Manufactured Via Laser Powder Bed Fusion

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