Universal type true-triaxial static load pre-loading system for split Hopkinson pressure bar

Abstract

A general-purpose true triaxial static load preloading system for split Hopkinson compression bars, the main reaction force steel frame is the carrier of the axial preloading system and the radial preloading system. The main reaction force steel frame is installed on the bracket of the guide rail system. Two sets of axial preloading systems are respectively located at both ends of the main body reaction steel frame, and are installed on the axial reaction frame of the main body reaction steel frame. The four sets of radial preloading systems are all installed in the middle of the longitudinal direction of the assembly beam of the main reaction force steel frame; the centerlines of the radial jack cylinders in each radial preloading system are perpendicular to the axial preloading system Centerline of the axial preload rod in the loading system. The present invention is applicable to a large-diameter separated Hopkinson pressure rod device, and can realize a variable-size true three-axis static load preloading system for independent and controllable application of three-way static loads on rock samples, and has strong versatility and good economical efficiency features. The invention has the advantages of simple structure, convenient installation and operation, and high degree of automation.

Description

technical field [0001] The invention relates to the technical field of material mechanical performance testing, in particular to a general-purpose true triaxial static load preloading system suitable for a split Hopkinson compression bar. Background technique [0002] Underground engineering rock masses are mostly under three-dimensional unequal stress conditions, and are often damaged by shock dynamic loads such as earthquake shocks, excavation blasts, and even weapon strikes. It is of great significance to study the impact mechanical properties of rock materials under true triaxial stress conditions. necessity. [0003] At present, it is difficult for the true triaxial testing machine to apply medium and high strain rate impact loads. 1 -10 3 the s -1 Classical test systems for dynamic properties of rock-like brittle materials have been widely used. The commonly used SHPB device is mainly used for testing the uniaxial mechanical properties of materials. The existing c...

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Problems solved by technology

The existing confining pressure SHPB device mainly conducts impact test after applying confining pressure to the sample, and the existing conventional three-axis dynamic and static combination test device mainly performs axial impact after applying lateral confining pressure and axial static stress to the sample. Both of them are difficult to achieve a good simulation of the three-dimensional unequal stress conditions of underground engineering rocks

[0004] At present, the improved multi-axis loading device based on the SHPB device has been applied. However, due to the diversity of the size and assembly of the SHPB device, most of them are upgraded and modified by the unit for its specific model. The universal variable-size true three-axis static The preloaded system has not yet appeared

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