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Device for detecting fatigue crack growth rate of sample in high-temperature environment

A technology of fatigue crack growth and high temperature environment, which is applied in the field of metal sample fatigue crack growth rate detection devices, can solve the problems of organic adhesive and strain sensitive components, lag of strain sensitive components, large temperature coefficient of resistance, etc., and solve the problem of poor combination problems, reduce contact resistance, and prevent high-temperature oxidation

Inactive Publication Date: 2021-10-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively large temperature coefficient of resistance, constantan alloy is difficult to be used to make high temperature strain gauges
At present, the commonly used foil-type high-temperature strain gauge material is iron-chromium-aluminum alloy (20%Cr+5%Al, Fe balance), the content of chromium and aluminum in iron-chromium-aluminum alloy is about 25%, and the surface of the alloy is easy to form dense oxidation. The oxide film containing Cr and Al has extremely poor wettability, and it is difficult for metal leads to be connected to the pins of the foil strain-sensitive element by brazing and other welding methods. Poor welding quality will produce large contact resistance and cause measurement data fluctuations
[0005] The high temperature environment will have a serious impact on organic adhesives and strain-sensitive components, and the measurement data may change due to the influence of time and temperature, causing problems such as hysteresis, zero drift and creep of strain-sensitive components

Method used

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  • Device for detecting fatigue crack growth rate of sample in high-temperature environment
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  • Device for detecting fatigue crack growth rate of sample in high-temperature environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 1 The embodiment shown is a high temperature environment, a sample fatigue crack spread rate detecting device, including a base 1, a frame 2 is provided on a base, a furnace 3, an upper end and a lower end opening on the rack; the rack is Up the U-shaped openings, such as figure 2 As shown, the cross section of the furnace is circular, and the furnace includes a left resonant shaft 31 that is fixedly coupled through the left fixed block 301 and the left resilient edge of the left reside, rotating with the vertical rotary axis. The left residual body and the left residual left groove and the left groove, the left groove and the right groove are provided in the left residual, and the left groove and the right groove are provided with heating wire 34. The left-resilient plate 311 on the left residual body and the right connection plate 331 provided on the right furnace body are detachably connected by bolts, and the right furnace body is provided with a handle 332;...

Embodiment 2

[0070] The thickness of the Zr film was 350 nm, the thickness of the ZrO film was 700 nm, the thickness of the AlN film was 450 nm, and the thickness of the gate NIMOMNV alloy film was 900 nm, and the thickness of the Aln protective film was 100 nm;

[0071] Among them, the elemental matching group of the NIMMNV alloy target has become Mo 9%, Mn 7%, V 6%, Ni margin; the impurity content of the NIMMNV alloy target is less than 0.01%, and the cavity defect is less than 0.05mm, the grain size is less than 30 μm. . Other content is the same as in Example 1.

Embodiment 3

[0073] The thickness of the Zr film was 350 nm, the thickness of the ZrO film was 700 nm, the thickness of the AlN film was 300 nm, and the thickness of the gate NIMOMNV alloy film was 1100 nm, and the thickness of the AlN protective film was 150 nm;

[0074] Among them, the elemental matching group of the NIMMNV alloy target became Mo 5%, Mn 5%, V 5%, Ni margin; the impurity content of NIMMNV alloy targets was less than 0.01%, and the cavity defect was less than 0.05mm, and the grain size was less than 30 μm. . Other content is the same as in Example 1.

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Abstract

The invention discloses a device for detecting a fatigue crack growth rate of a sample in a high-temperature environment. The device comprises a base, a rack arranged on the base, and a furnace arranged on the rack, wherein the upper end and the lower end of the furnace are open; the cross section of the furnace is annular; and the furnace comprises a left furnace body fixedly connected with the left part of the rack, a vertical rotating shaft fixedly connected with the outer edge of the left furnace body, and a right furnace body rotationally connected with the vertical rotating shaft. The device has the advantages of good stability and high reliability.

Description

Technical field [0001] The present invention relates to the field of metal sample fatigue test in a high temperature environment, in particular, to a high temperature environment in a stable high temperature environment, a metal specimen fatigue crack spread rate detecting device. Background technique [0002] The strain gauge extensometer is often used in the measurement of cracking open displacement of fracture mechanical test. When measuring, the extension coupling is sandwiched on the sample, and the crack opening opens through the transmitting rod to the strain sensitive element. [0003] During the actual application of ordinary foil strain sensitive components, an organic adhesive is usually pasted, such as polyester resin, epoxy resin and phenolic resin, and the like when installing the sensitive element. External environmental conditions can affect the curing and properties of the binder in a long period of time. One of the most important environmental factors is tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/36G01N3/18G01N3/10G01N3/06
CPCG01N3/36G01N3/18G01N3/10G01N3/066G01N2203/0005G01N2203/0017G01N2203/0048G01N2203/0066G01N2203/0073G01N2203/0226G01N2203/0617G01N2203/0676G01N2203/0682
Inventor 张林张万亮周成双张凯宇
Owner ZHEJIANG UNIV OF TECH
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