Test system and test method of multiphysics fatigue property

A technology of fatigue performance testing and multi-physics field, which is applied in the direction of measuring devices, strength characteristics, instruments, etc., can solve the problems that the fatigue performance of small piezoelectric ceramic samples cannot be effectively evaluated, and achieve the effect of high test accuracy

Inactive Publication Date: 2011-08-31
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0007] In order to overcome the difficulty in the existing equipment and technology that cannot effectively evaluate the fatigue performance of small piezoelectric ceramic samples in the electromechanical and thermoelectric coupling field

Method used

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  • Test system and test method of multiphysics fatigue property
  • Test system and test method of multiphysics fatigue property
  • Test system and test method of multiphysics fatigue property

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Experimental program
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Embodiment approach

[0050] Step 1: Refer to attached figure 1 , the PZT sample (6) is built into the mold (4), and the center of the sample (6) is located on the axis of the mold (4), and the upper and lower surfaces of the sample (6) are connected to the high and low voltage of the high voltage power supply (21) respectively. terminal connection, refer to the attached figure 2 , the acoustic emission sensor (31) is connected to the outer surface of the mold (4);

[0051] Step 2: Set the material mechanical performance testing machine (11) to provide the amplitude (2N), frequency (5Hz) and waveform (half sine wave) of the load, the current form (AC) and the test voltage (1kV) provided by the high-voltage power supply (21) ;

[0052] Step 3: Start the material mechanical performance testing machine (11) and the high-voltage power supply (21), apply the electromechanical cyclic load in the vertical direction to the PZT sample (6), and give the electromechanical coupling cyclic loading by the aco...

Embodiment 2

[0058] Implementation method of fatigue performance evaluation and life prediction of lead zirconate titanate (PZT) samples based on real-time monitoring of material damage and destruction under force-thermoelectric coupling conditions

[0059] With reference to specific embodiment 1, in step 1, with reference to the attached Figure 4 , connect one end of the waveguide rod (35) to the outer surface of the mold (4), and connect the other end to the acoustic emission sensor (31), refer to the attached image 3 , 4 , and further place the mold (4), part of the waveguide rod (35) in the cavity of the high temperature furnace (51); in step 2, further set the test temperature (120°C) of the high temperature furnace (51), and the high voltage power supply (21) test voltage (0.8kV); in step 3, start the high temperature furnace (51) further, carry out the cyclic loading of force thermoelectric coupling; other steps of force thermoelectric coupling are with the steps 4-7 of specific ...

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Abstract

The invention relates to a test system and a test method of multiphysics fatigue property, in particular to a fatigue property test system, a fatigue property evaluation and a life prediction method under the condition of coupling between power electricity and power thermoelectricity based on material damage and real-time monitoring damage, belonging to the field of material property evaluation. The fatigue property of piezoelectric ceramics small samples cannot be evaluated easily under the condition of coupling between power electricity and power thermoelectricity by current test device andtest technique due to the restrictions of test device and test platform, thus restricting the application development of piezoelectric ceramics materials and devices. Aiming at the existing problems,the invention completes reasonable selection and optimal combination design of force field, thermal field, electric field and acoustic emission in the fatigue property test system and a mould which is applicable to an MSP method, and provides the fatigue property evaluation and life prediction method of small samples; on the basis, the fatigue property evaluation and life prediction of piezoelectric ceramics and other samples which are based on material damage and real-time monitoring damage can be realized in the coupling field of power electricity and power thermoelectricity.

Description

technical field [0001] The invention relates to a multi-physics field fatigue performance testing system and a testing method, belonging to the field of material performance evaluation. Background technique [0002] The study of fatigue properties is very important for ceramic materials under long-term or reciprocating loads. Traditional fatigue performance testing methods usually use pre-crack uniaxial tensile and bending tests to study the fatigue behavior of ceramic materials. However, with the development trend of functional ceramic materials and their components in pieces and miniaturization, ceramic materials It is a thin plate or sheet, such as ceramic coating, substrate, etc., and it is impossible to obtain a test sample of a standard size. In addition, when the unidirectional tensile and bending test methods are used for cyclic fatigue testing, it is difficult to fix the sample. Therefore, traditional fatigue performance testing methods are difficult to evaluate th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00G01N29/14
Inventor 蔡艳红唐云山邓启煌张建峰王连军江莞陈立东
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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