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Three-dimensional impact loading experiment device

A technology of loading experiment and loading device, which is applied in the direction of measuring device, using repeated force/pulsation force to test the strength of material, instruments, etc., to achieve the effect of improving accuracy and ensuring synchronization

Inactive Publication Date: 2011-08-31
浣石
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The conventional three-dimensional SHPB testing machine can only realize the impact test of simply adding confining pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0051] Influence of the incident rod on the waveform

[0052] (1) A single loading rod ensures synchronization

[0053] If three one-dimensional SHPB pressure rods act on the specimen from three directions, there must be three loading rods, and the loading rods need to be pushed by the gas in the firing gun. Three loading rods need three solenoid valves. The minimum opening time of the solenoid valve is also on the order of microseconds, while the propagation speed of the shock wave in the rod is more than 5000 meters per second, that is to say, the opening time of the two valves is at least different , that is, it spreads as much as 5mm in the rod. For a SHPB compression rod with a diameter of 50mm, the thickness of the general specimen is only 1 to 20 mm, so the difference between the three waveforms in the loading time of the specimen will be large. It is very large, which obviously has a large error for three-axis simultaneous loading. Therefore, a single loading rod mu...

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Abstract

The invention discloses a three-dimensional impact loading experiment device, which belongs to the technical field of impact dynamics experiment devices. The three-dimensional impact loading experiment device is characterized by comprising a loading device, an incidence rod, a test piece and a transmission rod which are arranged sequentially; foil gauges are arranged on the incidence rod and the transmission rod respectively; the foil gauges are connected with a data acquisition and processing unit; the test piece is a cube; three incidence rods and three transmission rods are provided; one end of each of the incidence rods corresponds to a loading device, and the other end of the incidence rod is vertical to three vertical side faces of the test piece; the transmission rods are vertically arranged on the other three side faces of the test piece; and the incidence rods and the transmission rods correspond to each other one to one. The invention aims at providing the three-dimensional impact loading experiment device which is capable of really realizing three-dimensional dynamic loading and used for researching the dynamics performance of engineering materials under the three-dimensional dynamic loading.

Description

technical field [0001] The present invention relates to an impact loading experiment device, and more specifically relates to a three-dimensional impact loading experiment device. Background technique [0002] The Split Hopkinson Pressure Bar (SHPB) device is one of the basic experimental methods for studying the dynamic mechanical properties of various engineering materials. ~ between. The device was first proposed by B. Hopkinson, and later by R.M. Davis improved on it. In 1949, H. Based on these, Kolsky established a test method for the uniaxial dynamic compression performance test of materials, and tested the mechanical properties of metal materials at high strain rates. Its structure is as figure 1 As shown, the principle is that the sample is clamped between two slender elastic rods (incident rod and transmission rod), and the cylindrical bullet hits the other end of the incident elastic rod at a certain speed, generating a compressive stress pulse and moving alo...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01N3/02
Inventor 浣石陶维俊
Owner 浣石
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