Constant stress-ratio dynamic tension/compression-torsion testing device and method based on electromagnetic Hopkinson bar system

DU Bing; YUE Yifan; LIU Zhen; DING Yi; WANG Weibin; LIU Chenlin; GUO Yazhou; LI Yulong

doi:10.11883/bzycj-2025-0243

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DU Bing, YUE Yifan, LIU Zhen, DING Yi, WANG Weibin, LIU Chenlin, GUO Yazhou, LI Yulong. Constant stress-ratio dynamic tension/compression-torsion testing device and method based on electromagnetic Hopkinson bar system[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2025-0243

Citation:

DU Bing, YUE Yifan, LIU Zhen, DING Yi, WANG Weibin, LIU Chenlin, GUO Yazhou, LI Yulong. Constant stress-ratio dynamic tension/compression-torsion testing device and method based on electromagnetic Hopkinson bar system[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2025-0243

Citation:

DU Bing, YUE Yifan, LIU Zhen, DING Yi, WANG Weibin, LIU Chenlin, GUO Yazhou, LI Yulong. Constant stress-ratio dynamic tension/compression-torsion testing device and method based on electromagnetic Hopkinson bar system[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2025-0243

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Constant stress-ratio dynamic tension/compression-torsion testing device and method based on electromagnetic Hopkinson bar system

doi: 10.11883/bzycj-2025-0243

School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China

Received Date: 2025-08-10
Rev Recd Date: 2025-11-04

Available Online: 2025-11-13

Abstract

Abstract

In the field of material dynamic mechanical properties research, it is significant to obtain reliable data of materials under complex stress states. To address the challenge of achieving a stable stress ratio during combined loading, this work developed a novel device based on the electromagnetic Hopkinson bar (ESHB) platform. This device uniquely enables unilateral synchronous tension/compression-torsion combined dynamic loading. The paper detailed the device’s configuration and loading principles. The core innovation of this device is the independent generation of trapezoidal tensile/compressive and torsional stress waves. A multi-circuit pulse shaper produced tensile/compressive waves, while shear waves were generated using an electromagnetic clamp with torque storage. Crucially, a high-precision digital delay generator (DDG) ensured wave synchronization. With triggering accuracy within 0.1 μs, it controlled the arrival time difference of these distinct waves at the specimen to within 5 μs. This overcame the challenge posed by their different propagation velocities. Additionally, it described the synchronization control methodology and the wave propagation analysis essential for timing calculations. To validate the apparatus, dynamic tension-torsion experiments were conducted on CoCrFeMnNi high-entropy alloy specimens. The results show that the device is highly reliable and effective. It successfully achieved a stable stress ratio of approximately 1.7 throughout the loading duration. Furthermore, the experiments conclusively showed a key finding. Trapezoidal wave loading significantly enhances stress-ratio stability during combined dynamic loading. This improvement contrasts with the effect of traditional sinusoidal wave loading. This advancement offers a robust and controllable experimental method. It enables the study of materials’ dynamic mechanical responses under complex stress states. These states involve high-strain rates and multiaxial loading. This capability is especially valuable for aerospace, impact engineering, and materials science applications. The successful implementation of constant stress-ratio loading opens avenues for more accurate characterization of material yield criteria and failure mechanisms under dynamic multiaxial conditions.
- electromagnetic Hopkinson bar,
- dynamic loading,
- multiaxial loading,
- constant stress-ratio

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References(29)

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