Mechanical and electromagnetic response synchronous test system and method for dynamic fracture of brittle material
A brittle material and synchronous testing technology, applied in the direction of analyzing materials, electromagnetic field characteristics, measuring devices, etc., can solve the problems of limited testing accuracy and inability to accurately study the characteristics of brittle materials, and achieve the effect of solving triggers
Inactive Publication Date: 2020-01-21
中国兵器工业规划研究院
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Problems solved by technology
In the prior art, there are some experimental loading methods for the mechanical properties of brittle materials, and the test accuracy is limited, but there are few experimental loading methods for the measurement of the electromagnetic response of brittle materials. Therefore, the existing technology cannot accurately study the brittleness. Material properties
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[0039] Specifically taking the dynamic Brazilian disc experiment of granite as an example, the present invention will be further described in conjunction with the accompanying drawings.
[0040] Such as figure 1 As shown, a simultaneous testing system of mechanical and electromagnetic responses for dynamic fracture of brittle materials, including a Hopkinson rod loading subsystem, a load displacement testing subsystem, a sample subsystem, an antenna testing subsystem and an electromagnetic shielding subsystem;
[0041] The Hopkinson rod loading subsystem includes a barrel body 1, an impact rod 2, a variable section rod 3, an incident rod 4, a transmission rod 5, an absorption rod 6 and a damper 7 arranged concentrically from left to right;
[0042] The load displacement testing subsystem includes an incident rod strain gauge 8, a transmission rod strain gauge 9, an ultra-dynamic strain gauge 10 and a high-performance oscilloscope 11;
[0043] The sample subsystem includes a s...
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The invention discloses a mechanical and electromagnetic response synchronous test system and method for dynamic fracture of a brittle material. The system comprises a Hopkinson rod loading subsystem,a load displacement testing subsystem, a sample subsystem, an antenna testing subsystem and an electromagnetic shielding subsystem, wherein the surface of the sample is attached with an electrode anda strain gauge. The method comprises the following steps of establishing connection and performing electromagnetic shielding; carrying out launching impact and triggering an oscilloscope, outputtingan incident wave, a transmission wave and a reflected wave waveform graph by the oscilloscope, calculating a load, a displacement and a loading rate; outputting a strain curve of the sample by the oscilloscope, and outputting a surface charge curve determined by a sample electrode; outputting an electromagnetic radiation oscillogram of an electromagnetic receiving antenna and an electric receivingantenna by the oscilloscope; and determining the mechanical and electromagnetic response time sequence at the arrival moment, fracture starting moment and ending moment of stress wave, and calculating the crack expansion speed. According to the system and method, the mechanical and electromagnetic response characteristics of the brittle material can be synchronously tested, and the dynamic fracture mechanics and electromagnetic response characteristics of the brittle material can be accurately studied.
Description
technical field [0001] The invention belongs to the technical field of brittle material testing, in particular to a mechanical and electromagnetic response synchronous testing system and method for dynamic fracture of brittle materials. Background technique [0002] Brittle materials such as glass, ceramics, rocks, coal, ice, semiconductors, inorganic salts, etc. are prone to charge separation when they break, and the separation of charge oscillations can produce electromagnetic responses of different frequencies. In engineering practice, the instability caused by brittle materials is one of the important causes of dynamic disasters. The dynamic fracture of brittle materials generally exists in the fields of earthquake monitoring, mining engineering, blasting engineering, protection engineering, etc. The present invention is a real-time, long-distance, non-contact and effective test experiment system and method for studying the dynamic fracture of brittle materials. [0003...
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IPC IPC(8): G01N3/307G01N3/06G01R29/08
CPCG01N3/06G01N3/066G01N3/307G01N2203/001G01N2203/0044G01N2203/0066G01N2203/0067G01N2203/0617G01N2203/0676G01N2203/0682G01N2203/0688G01R29/0835G01R29/0871G01R29/0878
Inventor 刘志祥张庆明王骏辉叶姣
Owner 中国兵器工业规划研究院
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