Dynamic Brazilian splitting experiment of bedding shale based on continuum-discrete coupled method

Tang, Wei; Zhai, Cheng; Yu, Xu; Xu, Jizhao; Sun, Yong; Cong, Yuzhou; Zheng, Yangfeng; Wang, Yu

doi:10.1016/j.ijimpeng.2022.104289

Cited by 19 publications

(1 citation statement)

References 43 publications

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“…With the development of material dynamic test technology and the increase in material diversity, the SHPB test technique's research objects have been expanded to brittle materials, soft materials, foam materials, polymer materials, and composite materials, which have been applied in various fields [1][2][3][4][5][6][7][8][9][10]. In addition to the conventional dynamic compression test, the dynamic tensile properties and crack propagation laws of materials can also be studied using the dynamic Brazilian disc split tensile test, which has a different loading mode compared to the former [11][12][13][14][15][16][17][18]. Since the introduction of the SHPB test technique, it has played a non-negligible role in the study of the mechanical response of materials under medium-and high-strain-rate loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

Yang,

Li,

Qiao

2023

Processes

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Since the split-Hopkinson pressure bar (SHPB) test technology was proposed, it has played an important role in the study of dynamic mechanical properties of materials under the impact of dynamic load. It is a major test technology for the study of dynamic mechanical properties of materials. The expansion of the range of materials studied has also posed a challenge to the SHPB test technique, requiring some improvements to the conventional SHPB test apparatus and analysis methods to meet the test conditions and ensure the accuracy of its results. Based on a systematic review of the development of the SHPB test technique and the test principles, the main factors that influence the test’s ability to meet the two basic assumptions at this stage are analyzed, and the ways to handle them are summarized. The stress wave dispersion phenomenon caused by the transverse inertia effect of the pressure bar means that the test no longer satisfies the one-dimensional stress wave assumption, while the pulse-shaping technique effectively reduces the wave dispersion phenomenon and also has the effect of achieving constant strain rate loading and promoting the dynamic stress equilibrium of the specimen. Impedance matching between the pressure bar and specimen effectively solves the problem of the test’s difficulty because the transmitted signal is weak, and the assumption that the stress/strain is uniformly distributed along the length of the specimen is not satisfied when studying low-wave impedance material with the conventional SHPB test device. The appropriate pressure bar material can be selected according to the value of the wave impedance of the test material. According to the wave impedance values of different materials, the corresponding suggestions for the selection of pressure bar materials are given. Moreover, a new pressure bar material (modified gypsum) for materials with very-low-wave impedance is proposed. Finally, for some materials (foamed concrete, aluminum honeycomb, porous titanium, etc.) that cannot meet the two basic assumptions of the test, the Lagrangian analysis method can be combined with SHPB test technology application. Based on the analysis and calculation of the energy conservation equation, the dynamic constitutive relationship of the materials can be obtained without assuming the constitutive relationship of the experimental materials.

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