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Tensile fatigue-four-point flexural fatigue in-situ mechanical testing device and testing method thereof

A four-point bending and testing device technology, applied in the direction of using a stable bending force to test the strength of materials, measuring devices, and using repeated force/pulse force to test the strength of materials, etc. Real-time observation of material microstructure and other problems, to achieve the effect of compact structure and small volume

Pending Publication Date: 2017-05-31
YANCHENG INST OF TECH
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Problems solved by technology

Due to the limitation of commercial testing machines, the experiment cycle is long and expensive, and the fatigue fracture microstructure of the material specimens is researched and analyzed after the fatigue test is completed using scanning microscope

Method used

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  • Tensile fatigue-four-point flexural fatigue in-situ mechanical testing device and testing method thereof
  • Tensile fatigue-four-point flexural fatigue in-situ mechanical testing device and testing method thereof
  • Tensile fatigue-four-point flexural fatigue in-situ mechanical testing device and testing method thereof

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Embodiment Construction

[0040] The detailed content of the present invention and its specific implementation will be further described below in conjunction with the accompanying drawings.

[0041] see Figure 1 to Figure 6 As shown, the tensile fatigue-four-point bending fatigue in-situ mechanical testing device of the present invention includes four-point bending preload loading and detection unit, four-point bending fatigue loading unit, tensile preload loading and detection unit, tensile fatigue Load unit.

[0042] The four-point bending preload loading unit is: the DC servo motor I1 is connected to the test platform base 33 through the motor flange I2, and the deceleration and torque increase are realized through the worm gear I5 and the worm I6, driving the one-way ball screw II36 to The rotary motion is converted into the linear reciprocating motion of the bending module support seat 34 , finally realizing the quasi-static loading of the four-point bending test indenter 28 on the tested sample...

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Abstract

The invention relates to a tensile fatigue-four-point flexural fatigue in-situ mechanical testing device which comprises a tensile-fatigue pre-load loading unit, a tensile fatigue loading unit, a four-point flexural fatigue pre-load loading unit and a four-point flexural fatigue loading unit, wherein the tensile fatigue loading unit is used for driving a first-stage worm and gear component to drive a bidirectional screw rod nut pair to achieve quasi-static loading through a motor; a flexible chain is driven by piezoelectric ceramic to achieve medium-low frequency reciprocation movement of a test part in an axial tensile direction; the four-point flexural fatigue loading unit is used for driving a worm and gear to drive a one-way screw rod nut pair to achieve four-point flexural pressure head loading through another motor, four-point flexural pressure head loading is achieved with the combination of piezoelectric stack and a flexible hinge mechanism, and under a certain flexural load, a pressure head is driven through piezoelectric stack to output micro alternating displacement, and thus low-frequency fatigue loading under a flexural load. The tensile fatigue-four-point flexural fatigue in-situ mechanical testing device is compact in structure and reliable in principle, and in-situ testing on micro deformation, damage and cracking process of a material under flexural fatigue and four-point flexural fatigue stress can be implemented under observation of various imaging instruments.

Description

technical field [0001] The invention relates to the field of electromechanical integration precision scientific instruments, in particular to an in-situ mechanical testing device based on tensile fatigue-four-point bending fatigue. Background technique [0002] Metal fatigue is an important part of material science, and it has increasingly shown its important role in improving product quality and engineering applications. Due to the limitation of commercial testing machines, the experiment cycle is long and expensive, and the fatigue fracture microstructure of the material specimens is studied and analyzed after the fatigue test is completed using imaging equipment such as scanning microscopes, which cannot realize the material specimens being subjected to multiple loads. The real-time observation of the microscopic morphology of materials under stress has certain limitations on the study of the fatigue mechanical properties of materials. [0003] The fatigue testing machin...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/20G01N3/38
CPCG01N3/08G01N3/20G01N3/38G01N2203/0026G01N2203/0007
Inventor 侯鹏亮王福元刘必荣黄晓峰耿其东崔建中荣冬松梁华王凤兰
Owner YANCHENG INST OF TECH
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