Test method for carrying out one-dimensional stress wave propagation on layered composite material

Abstract

The invention belongs to the technical field of engineering material tests, and discloses a test method for carrying out one-dimensional stress wave propagation on a layered composite material. According to the test method for carrying out one-dimensional stress wave propagation on the layered combined material, a layered combined material sample is composed of a bulletproof layer, a gravel dispersion layer and a structural layer and is packaged in a sleeve; a structural layer is fixed to the bottom of the sleeve, and a PVDF film pressure sensor is pasted to the upper end face of the structural layer; a gravel dispersing layer and a fixed bullet shielding layer are arranged in the sleeve; a PVDF film pressure sensor is also pasted on the end face of the lower end of the bullet shielding layer, and layered combined material samples are slowly installed between the incident bar and the transmission bar in parallel; a transmitting system is arranged in front of the incident bar; and a damper is arranged behind the transmission rod. The test method can be used for carrying out experimental research on the one-dimensional stress wave propagation rule of the layered combined material indoors, and also can be used for carrying out experimental research on the stress-strain constitutive relationship of the sandy soil type loose material.

Description

technical field [0001] The invention belongs to the technical field of engineering material testing, and in particular relates to a testing method for one-dimensional stress wave propagation of layered composite materials. Background technique [0002] The test of stress wave propagation law for layered composite materials is currently a common practice at home and abroad. Generally, the sensor is embedded in the layered composite material for testing through field explosion tests. The main problem of this kind of test method is that the requirements for the performance, size, explosion impact loading safety and field test environment of the sensor are getting higher and higher: First, the frequency bandwidth and response time of the sensor are required to measure the explosion impact load. The second is that the structure of the sensor should be reasonable to reduce the measurement error caused by the mismatch between the sensor and the layered material medium; the third is...

AI Technical Summary

Problems solved by technology

The main problem of this kind of test method is that the requirements for the performance, size, explosion impact loading safety and field test environment of the sensor are getting higher and higher: First, the frequency bandwidth and response time of the sensor are required to measure the explosion impact load. The second is that the structure of the sensor should be reasonable to reduce the measurement error caused by the mismatch between the sensor and the layered material medium; the third is that the size of the sensor should be flexible to meet the test needs of various loose or rigid media, For example, the size of the sensor should be as small as possible to meet the requirements of the field test; the fourth is to overcome the impact of the environment and climate change on the test results brought about by the impact explosion test in the field, including the safety of the test process and the cost of the test.

In addition, when measuring the stress on the interface embedded in the layered composite material, it is also required not to damage the integrity of the layered material interface due to the installation of sensors, thereby weakening or enhancing the strength of the material and causing deviations in test results

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