Rotating bending fatigue detecting device and rotating bending fatigue test method

A bending fatigue detection device technology, applied in the field of bending fatigue test, can solve problems such as complex structure, poor loading accuracy, cumbersome assembly of parts, etc., and achieve the effects of high safety, low cost and high degree of automation

Active Publication Date: 2018-03-13
CHINA AERO POLYTECH ESTAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing rotary bending fatigue testing machine, such as complex structure, cumbersome assembly of components, and poor loading accuracy by relying on weights, a lightweight, high-precision, safe and environmentally friendly rotary bending fatigue testing device is provided.

Method used

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  • Rotating bending fatigue detecting device and rotating bending fatigue test method
  • Rotating bending fatigue detecting device and rotating bending fatigue test method
  • Rotating bending fatigue detecting device and rotating bending fatigue test method

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specific Embodiment

[0057] The following is an example of the rotating bending fatigue test of the rotating bending smooth test piece of No. 45 steel after normalizing treatment, where E=200.1Gpa, σ max =250Mpa,k t =1.

[0058] Calculate strain gauge ε=,, σmax / E=, 250×1000 / 200.1≈1250

[0059] E - modulus of elasticity

[0060] σmax———Test stress value

[0061] Kt - stress concentration factor

[0062] ε——strain value.

[0063] According to the test requirements, the test piece is connected with the self-aligning unit and the supporting connection unit respectively and the strain gauges are installed.

[0064] Connect the strain gauge and strain tester, and adjust to zero. A prescribed loading stress is applied by adjusting the loading bolt. In this embodiment, the reading of the strain tester is adjusted to 1250 microstrain, and the locking nut is fixed. According to the test requirements, the speed is set to 3000r / min, the speed can be adjusted during the test, and the number of test life...

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Abstract

The invention provides a rotating bending fatigue detecting device. The rotating bending fatigue detecting device comprises an aligning unit, a strain measuring unit, a supporting connecting part, a fixed mounting unit, a servo motor and a test control unit, wherein the fixed mounting unit is fixedly arranged on ground through a fixed bottom plate; a first end of a test part is connected with oneend of the aligning unit; a second end of the test part is connected with the first end of the supporting connecting unit; the second end of the supporting connecting unit is connected with the firstend of a shaft coupler through an adapting joint; the first end of the shaft coupler is connected with one end of the servo motor; and the aligning unit, the supporting connecting unit and the servo motor are fixedly arranged on the fixed mounting unit separately. A strain plate and an eccentric device are adopted to regulate a stress load value and a conventional rotating bending fatigue film, sothat a complex weight loading device is omitted, mounting use is more convenient, and loading precision is higher; and the tester is simpler, is lower in cost, is high in degree of automation of thetest, and is safety to use.

Description

technical field [0001] The invention belongs to the technical field of bending fatigue tests, and in particular relates to a rotating fatigue bending test device and a rotating bending fatigue testing method. Background technique [0002] Bending fatigue is a common phenomenon in engineering. In the early stage of fatigue, the internal structure will change, followed by the nucleation and propagation of fatigue cracks. When the fatigue cracks are unstable and expand to a certain extent, fatigue fracture will occur. The relationship curve (S-N curve) between the maximum stress or stress amplitude and its fracture cycle can be established through the standard method bending fatigue test to evaluate the bending fatigue test performance of different materials. Rotary bending fatigue test is a typical material bending fatigue test method, which is used to evaluate the cleanliness of materials. [0003] Most of the existing rotary bending fatigue testing machines are test devices...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N3/02
CPCG01N3/02G01N3/32G01N2203/0258G01N2203/0682G01N2203/0005G01N2203/0023G01N2203/0073
Inventor 张辉郭浩然张宗华
Owner CHINA AERO POLYTECH ESTAB
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