Piezoelectric stack direct driving type macro-micro combined biaxial stretching-fatigue testing system

A technology of piezoelectric stacking and biaxial stretching, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve the problems of low control accuracy, large volume, expensive imaging equipment, etc., and achieve Convenient specimen clamping, good compatibility and quick response

Pending Publication Date: 2017-05-17
JILIN UNIV
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Problems solved by technology

[0003] The existing large-scale biaxial tensile testing machine has the advantages of large loading force, large stroke, strong rigidity, and good stability. However, due to volume limitations, the types of compatible imaging devices are limited, and the imaging equipment used in conjunction with them is also relatively expensive. It is difficult to install and clamp small millimeter-scale test pieces. The hydraulic system is used as the driving

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  • Piezoelectric stack direct driving type macro-micro combined biaxial stretching-fatigue testing system
  • Piezoelectric stack direct driving type macro-micro combined biaxial stretching-fatigue testing system
  • Piezoelectric stack direct driving type macro-micro combined biaxial stretching-fatigue testing system

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[0027] The detailed content of the present invention and its specific implementation will be further described below in conjunction with the accompanying drawings.

[0028] see Figure 1 to Figure 4 As shown, the present invention provides a piezoelectric stack direct-drive macro-micro combined biaxial tension-fatigue testing system. It includes a precision drive-transmission unit, a CCD imaging detection unit, a mechanical and deformation signal detection unit, a specimen clamping unit, a piezoelectric stack driver unit, etc.; wherein the precision loading-transmission unit is fixed on the base plate 10 by screws, The piezoelectric stack driver unit is installed on the precision load-transmission unit through the pull ring I 8 and the pull ring II 7. The piezoelectric stack driver unit is respectively connected to the specimen clamping unit through two identical pull-ring connection blocks 9, the mechanical and deformation signal detection unit is installed on the pull-ring ...

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Abstract

The invention relates to a piezoelectric stack direct driving type macro-micro combined biaxial stretching-fatigue testing system, and belongs to the field of precision scientific instruments. The piezoelectric stack direct driving type macro-micro combined biaxial stretching-fatigue testing system is mainly composed of a precision driving-transmission unit, a CCD (Charge Coupled Device) imaging detection unit, a mechanical and deformation signal detection unit, a test piece clamping unit and a piezoelectric stack driver unit. In a testing process, the CCD imaging detection unit is used for carrying out in-situ observation on a central point of a test piece; once the central point is deviated, real-time deviation compensation can be carried out through the large-rigidity and high-frequency response piezoelectric stack driver unit, and a position of the central point of the test piece in the testing process is relatively fixed. The testing system has a wide application range, and can be used for realizing single-axis/double-axis stretching tests and single-axis/double-axis stretching fatigue tests; the testing system has good compatibility with an optical imaging system, and can be used for carrying out correlation rule researches of a microstructure and a deformation damage mechanism of materials.

Description

technical field [0001] The invention relates to a tensile testing device, which can be used for uniaxial / biaxial stretching, uniaxial / biaxial stretching-fatigue material micromechanical property testing platform. The system can be combined with other optical microscopes to dynamically monitor the microstructure evolution behavior and fatigue failure mechanism of the test piece during the test process; through the mechanical and displacement signal detection unit, the tensile and deformation signals of the test piece during the test process can be collected, and finally can be Record the stress-strain history of the specimen under the corresponding load, and then analyze the relevant mechanical properties of the material; through the analysis and processing of the force and deformation signals collected by the mechanical and deformation signal detection unit, combined with the output compensation of the piezoelectric stack, the test system can be realized closed-loop control. ...

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0051G01N2203/0073
Inventor 范尊强周明星张富于淼王顺博乔元森洪坤刘航肖慧琼杨立国任壮王志伟薛博然刘秋成
Owner JILIN UNIV
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