An experimental technique for medium strain-rate loading by a progressive cam

MIAO Chunhe; XU Songlin; MA Hao; YUAN Liangzhu; LU Jianhua; WANG Pengfei

doi:10.11883/bzycj-2022-0344

Volume 43 Issue 3

Mar. 2023

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Article Navigation > Explosion And Shock Waves > 2023 > 43(3): 034101

MIAO Chunhe, XU Songlin, MA Hao, YUAN Liangzhu, LU Jianhua, WANG Pengfei. An experimental technique for medium strain-rate loading by a progressive cam[J]. Explosion And Shock Waves, 2023, 43(3): 034101. doi: 10.11883/bzycj-2022-0344

Citation:

MIAO Chunhe, XU Songlin, MA Hao, YUAN Liangzhu, LU Jianhua, WANG Pengfei. An experimental technique for medium strain-rate loading by a progressive cam[J]. Explosion And Shock Waves, 2023, 43(3): 034101. doi: 10.11883/bzycj-2022-0344

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An experimental technique for medium strain-rate loading by a progressive cam

doi: 10.11883/bzycj-2022-0344

1.
CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230026, Anhui, China
2.
United Laboratory of High-Pressure Physics and Earthquake Science, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China

Received Date: 2022-08-09
Rev Recd Date: 2022-10-08

Available Online: 2022-10-12

Publish Date: 2023-03-05

Abstract

Abstract

A medium strain rate compression experimental system based on a progressive cam was developed to realize multiple medium strain rate loading. The developed experimental system uses the servo motor to drive the energy storage flywheel to rotate at a certain speed, and when the clutch is started, the energy storage flywheel can drive the loading cam to rotate. The loading cam pushes the loading guide bar and the input bar to compress the sample. When the loading cam rotates one circle, a single medium strain-rate compression is completed. At the same time, when the first stage compression is about to end, the stepper motor rapidly pushes the energy storage flywheel close to the loading cam for the next compression, and the cycles repeat to achieve multiple medium strain rate compression. The load and deformation of the material during compression were measured by strain gauges and a velocity interferometer system for any reflector (VISAR), respectively. The strain gauges were affixed to the input bar and the support bar, respectively. The strain signals of the bars during compression were recorded by the strain gauges and the forces exerted on the sample were obtained based on these strain signals. Two fiber optic probes of the VISAR system were used to measure the velocities of the input bar and the support bar during compression. Based on the two velocity curves measured, the velocity difference curve between the two ends of the sample was obtained, and then the deformation of the sample was gained by integrating the velocity difference. The stress-strain curves were obtained from the load- and deformation-time curves. Taking the paper honeycomb sample as an example, the reliability of the developed medium strain rate experimental system was discussed based on the high-speed images. The dynamic compressive mechanical properties of the paper honeycomb samples with the thickness of 10 mm and the diameter of 14.5 mm at the strain rate of 3.5 s⁻¹ were studied. The stress-strain curves and deformation processes of the paper honeycomb samples during single compression and double compression were obtained. The experimental system could realize multistage progressive medium strain rate loading. The peak strength and plateau stress of the paper honeycomb samples at medium strain rates well connect the dynamic compression results at high strain rates with the quasi-static compression results at low strain rates. The failure modes of the samples are mainly out-of-plane buckling and in-plane shear after quasi-elastic deformation.
- medium strain rate,
- paper honeycomb,
- mechanical performance,
- compression experiment

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References(29)

References

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