Test method for cyclic fatigue life under condition of piezoelectric ceramics force electric coupling

A technology of piezoelectric ceramics and testing methods, which is applied in the direction of testing the strength of materials by applying repetitive force/pulsation force, etc., can solve the problems of difficulty in guaranteeing residual strength, exaggerated fatigue, and the stress state of ball compression method is not a standard stress state, etc. To achieve the effect of simple and feasible test method

Inactive Publication Date: 2012-07-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ball pressure method is a common method to evaluate the cyclic fatigue performance of ceramic materials at present. This method is simple to fix the sample, but the stress intensity is very concentrated during the test process, especially in the early stage of the test. Therefore, the evaluation results of this method often exaggerate the effect of fatigue. , and the stress state of the ball pressure method is not the standard stress state
In addition, after using the ball pressure method for fatigue loading, other methods still need to be used to evaluate the remaining strength, but it is difficult to ensure that the test point of the remaining strength is the loading point of the fatigue test

Method used

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  • Test method for cyclic fatigue life under condition of piezoelectric ceramics force electric coupling
  • Test method for cyclic fatigue life under condition of piezoelectric ceramics force electric coupling
  • Test method for cyclic fatigue life under condition of piezoelectric ceramics force electric coupling

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Embodiment 1

[0027] This embodiment discloses a test method for the cyclic fatigue life of piezoelectric ceramics under electromechanical coupling conditions. The samples used in this method are obtained by the following method: using PZT52 / 48 bulk piezoelectric ceramics purchased in the market, cut A square piece with a thickness of about 1mm and a side length of 10mm was produced, then after rough grinding and fine grinding, and finally a sample with a thickness of about 0.7mm was made by single-sided polishing with 1μm diamond, and silver electrodes were plated on both sides.

[0028] Using load control to test the cyclic fatigue performance of PZT ceramics, the steps are as follows:

[0029] Step 1. Apply an AC electric field to the sample 5 through the lower guide mold 3 and the lower carrier mold 7 from the high-voltage power supply 9, the amplitude of the AC electric field is 600V / mm, and the frequency is 50Hz;

[0030] Step 2. Apply load-controlled cyclic fatigue loading to the sam...

Embodiment 2

[0034] This embodiment discloses a test method for the cyclic fatigue life of piezoelectric ceramics under electromechanical coupling conditions. The samples used in this method are obtained by the following method: using PZT52 / 48 bulk piezoelectric ceramics purchased in the market, cut A disc with a thickness of about 1mm and a diameter of 10mm was produced, then after rough grinding and fine grinding, and finally a sample with a thickness of about 0.5mm was made by single-side polishing with 1μm diamond, and silver electrodes were plated on both sides respectively.

[0035] Using load control to test the cyclic fatigue performance of PZT ceramics, the steps are as follows:

[0036] Step 1. Apply an AC electric field to the sample 5 through the lower guide mold 3 and the lower carrier mold 7 from the high-voltage power supply 9, the amplitude of the AC electric field is 600V / mm, and the frequency is 50Hz;

[0037] Step 2. Apply load-controlled cyclic fatigue loading to the sa...

Embodiment 3

[0041] This embodiment discloses a test method for the cyclic fatigue life of piezoelectric ceramics under electromechanical coupling conditions. The samples used in this method are obtained by the following method: using PZT52 / 48 bulk piezoelectric ceramics purchased in the market, cut A disc with a thickness of about 1mm and a diameter of 10mm is produced, then after rough grinding and fine grinding, and finally a sample with a thickness of about 0.3mm is made by single-side polishing with 1μm diamond, and silver electrodes are plated on both sides respectively.

[0042] Using load control to test the cyclic fatigue performance of PZT ceramics, the steps are as follows:

[0043] Step 1. Apply a DC electric field to the sample 5 through the lower guide mold 3 and the lower carrier mold 7 from the high-voltage power supply 9. The amplitudes of the DC electric fields are respectively -1000V / mm, and the negative electric field means that the direction of the electric field is opp...

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Abstract

The invention provides a test method for cyclic fatigue life under the condition of piezoelectric materials force electric coupling, which comprises the following steps of: loading an electric field while measuring a mechanical property; introducing circuits on an upper end and a lower end of a sample so as to directly load an electric field; loading in various compounding forms such as circulation alternating stress and a steady electric field, steady stress and a circulation alternating electric field, and monotonous stress and the steady electric field to realize an effective force electric field coupling function, and thereby testing the cyclic fatigue life of piezoelectric materials under a force electric coupling field. The test method is simple and is suitable for small-size flaky materials, and the test cost is saved; and after the cyclic fatigue is applied, the residual strength of the materials can be tested directly, so that a position of the cyclic fatigue test and a position of the residual strength performance are kept in the same place, the effectiveness of the test result is ensured, and the cyclic fatigue life of the piezoelectric materials under the condition of force electric coupling is obtained.

Description

technical field [0001] The invention relates to a test method for the cyclic fatigue life of piezoelectric ceramics under electromechanical coupling conditions, which can test the cyclic fatigue life under electromechanical coupling loading, and is applicable to the cyclic fatigue life of small samples under electromechanical coupling conditions in the field of microelectronics evaluation of. Background technique [0002] Piezoelectric materials have excellent electromechanical coupling effects and responsiveness to external electric fields, and have been widely used in the production of conventional components such as large-capacity capacitors and sensors, as well as high-tech electronic products such as micro-drivers and micro-actuators. However, piezoelectric ceramics used in piezoelectric pressure sensors and microactuators need to serve under cyclic electric and force fields. After a large number of periodic fatigue loadings, it will suffer fatigue damage under the acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
Inventor 江莞邓启煌王连军李耀刚张青红王宏志
Owner DONGHUA UNIV
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