Test method for dynamic anisotropy properties of solids under high temperature and medium-low strain rate loading

Abstract

The invention provides a method for testing dynamic anisotropy characteristics of solids under high temperature and medium-low strain rate loading. The method comprises the following steps that step 1, heating plates are attached to the surface of a sample, the sample is heated directly, and heating pipes are arranged in the heating plates in contact with the sample in a built-in mode; step 2, a total of 6N grooves is formed in rigid pressing plates in six directions of a rock sample, N is equal to 2 or N is equal to 3 or N is equal to 4 or N is equal to 5 or N is equal to 6, 6N acoustic emission sensors are embedded in the rigid pressing plate, and the acoustic emission sensors are provided with active excitation and reception ultrasonic functions; and step 3, according to an initial state rock sample, a temperature coupled load test rock sample and the test requirement correspondingly, the rock samples are monitored and acquired for dynamic mechanical parameters under different loading states. According to the method, the difficulty of dynamic data monitoring of a true triaxial test device is effectively overcome, by arranging the acoustic emission sensors in the rigid pressing plates in a built-in mode, and the quantitative measurement of the dynamic mechanical parameters of the rock samples, such as wave velocity and damage evolution characteristics, can be realized.

Description

technical field [0001] The invention relates to the field of material mechanics, in particular to the test of dynamic mechanical parameters of rocks, concrete and other materials under the condition of temperature-pressure coupled medium and low strain rate loading. Background technique [0002] When the strain rate level of the rock is greater than 10 -3 the s -1 , the influence of its own inertia effect cannot be ignored, which belongs to the category of dynamics research. The most commonly used test device for testing the dynamic mechanical properties of rocks is the Hopkinson bar test system, which can provide medium and high strain rate ranges, that is, 10 1 the s -1 to 10 2 the s -1 strain rate loading in the range. In contrast, the low and medium strain rate range, that is, the strain rate is 10 -3 the s -1 to 10 1 the s -1 There are relatively few test devices in the range, and conventional hydraulic servo machines can only provide up to 10 -1 the s -1 Th...

AI Technical Summary

Problems solved by technology

[0004] At present, there are still some deficiencies in the testing of dynamic mechanical parameters of rocks, especially for the dynamic true triaxial test system used for medium and low strain rates. Since the six surfaces of the sample are in direct contact with the indenter, the strain cannot be pasted on the surface of the sample. The deformation characteristics of the sample during the slice acquisition test

At the same time, high-speed cameras and speckle technology cannot capture the deformation and failure characteristics of the rock surface during the test.

In addition, parameters related to rock dynamics, such as wave velocity, dynamic damage evolution inside the sample, etc., cannot be determined quantitatively.

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