Device for testing fatigue crack growth rate of metal material in aqueous corrosive medium

A fatigue crack propagation and metal material technology, applied in the field of metal fatigue crack growth rate test devices, can solve problems such as difficulty in accurately observing crack length, and achieve the effect of reducing labor intensity and improving accuracy

Inactive Publication Date: 2014-01-01
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when there is a corrosive medium, it is generally difficult to accurately observe

Method used

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  • Device for testing fatigue crack growth rate of metal material in aqueous corrosive medium
  • Device for testing fatigue crack growth rate of metal material in aqueous corrosive medium

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Embodiment Construction

[0018] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0019] combine Figure 1~2 , the test device of the metal material fatigue crack growth rate in the aqueous corrosive medium adopts a single-side notch three-point bending (SEB) test piece, and an integral knife edge is designed on the test piece, and the knife edge of the test piece is upward, so that the extensometer is just above the test piece.

[0020] According to the installation method of the specimen, the corrosion solution circulation system was designed so that the specimen below the crack tip was completely immersed in the corrosion solution. It is characterized in that it includes a test container 1, a lower pressure head 12 and an overflow pipe 11 installed on the test container 1, a temperature controller 2, a rust filtering device 6 and a water pump 8 are connected through a hose 7, and the water pump 8 connects the The corrosive solution 10 is i...

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Abstract

The invention aims to provide a device for testing a fatigue crack growth rate of a metal material in an aqueous corrosive medium. The device comprises a liquid storage container, a test container and a fatigue testing machine, wherein the liquid storage container is filled with a corrosive solution for testing, the corrosive solution sequentially flows through a rust filtering device and a temperature controller through a water supply hose to be communicated with the test container, an upper pressure head and a lower pressure head are mounted on the fatigue testing machine respectively, a test piece is clamped between the upper pressure head and the lower pressure head and placed in the test container, the upper pressure head has two loading points matched with the upper surface of the test piece, the lower pressure head has one loading point matched with the lower surface of the test piece, an extensometer is mounted in a crack opening of the test piece and connected with the fatigue testing machine, an overflow pipe is arranged in the test container and communicated with the corrosive solution in the liquid storage container through the water returning hose. The device can completely protect the extensometer and the fatigue testing machine from being corroded by the corrosive solution, the labor intensity can be reduced, and the testing accuracy of a fatigue crack length can be improved.

Description

technical field [0001] The invention relates to a test device, in particular to a metal fatigue crack growth rate test device. Background technique [0002] Fatigue problems of metal materials in aqueous corrosive media are ubiquitous in the fields of ship and ocean engineering, petrochemical, aviation and nuclear power. In order to carry out reasonable material selection and evaluation, fatigue crack growth rate testing of metallic materials in aqueous corrosive media is required. [0003] The difficulty of the fatigue crack growth test in the aqueous corrosive medium environment lies in the installation of the extensometer and the design of the corrosive solution circulation device. GB / T6398-2000 recommends using compact tensile (CT) specimens and central crack tensile (MT) specimens for testing. The installation position of the extensometer of the CT specimen is at the same level as the crack growth plane, and only the horizontal fatigue testing machine can be used for ...

Claims

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Application Information

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IPC IPC(8): G01N3/32
Inventor 曲先强马永亮崔洪斌谢耀国李新飞
Owner HARBIN ENG UNIV
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