Acoustic emission inspection based research method for expanding characteristics of fatigue cracks of magnesium alloy stir-friction welding head

A fatigue crack propagation and friction stir welding technology, which is used in material analysis, strength characteristics, and measuring devices using sonic emission technology. Effect

Inactive Publication Date: 2017-06-20
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] Acoustic emission technology is a non-destructive testing technology widely used in various material deformation, fracture and phase transformation processes. However, acoustic emission is rarely used to study the loading process of magnesium alloys, and the research on crack propagation characteristics after friction stir welding has not been involved.

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  • Acoustic emission inspection based research method for expanding characteristics of fatigue cracks of magnesium alloy stir-friction welding head

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[0019] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] The research method of fatigue crack growth characteristics of magnesium alloy friction stir joint based on acoustic emission detection includes the following steps:

[0021] First, set the friction stir welding parameters, and process a 5mm thick AZ31B magnesium alloy butt weld on the friction stir welding machine. The equipment model of the friction stir welding machine is FSW-LM-AM16-2D. The length of the stirring needle is 4.85mm, the diameter of the stirring needle is 5mm, the rotation speed of the spindle is 1200r / min, and the welding speed is 300mm / min;

[0022] Second, according to the GB / T6398-2000 standard, three sets of compact tensile samples after friction stir welding of AZ31B magnesium alloy were processed. and back side (10mm from the center of the weld). The thickness of the sample is B=5mm, ...

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Abstract

The invention discloses an acoustic emission inspection based research method for expanding characteristics of fatigue cracks of a magnesium alloy stir-friction welding head, and belongs to the technical field of mechanical properties of the magnesium alloy materials. The method is characterized in that in a process of expanding a test piece under action of fatigue load for a precrack-containing magnesium alloy, internal energy of the test piece is increased as a result of an elastic-plastic deformation effect, and finally, the energy is released while the cracks expand to obtain a relationship curve between an internal acoustic emission signal of the test piece and circulating times; the expansion condition of the fatigue test piece is determined by analyzing curve shape features, so that the critical value when the magnesium alloy enters an unstable propagation stage is obtained. The method does not require an experimenter to observe the test piece all the time, and has the advantages of being convenient, quick, accurate and the like.

Description

technical field [0001] The invention discloses a research method for fatigue crack growth characteristics of magnesium alloy friction stir joints based on acoustic emission detection, and belongs to the technical field of mechanical properties of magnesium alloy welded joints. It relates to the field of materials, specifically a technical solution for the fatigue crack propagation characteristics of magnesium alloys after friction stir welding based on acoustic emission detection. Background technique [0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, excellent electrical and thermal conductivity, good vibration absorption and noise reduction and electromagnetic shielding, dimensional stability and ductility, small specific gravity, easy to recycle, etc., and partially replaces aluminum There is a lot of room for development in alloy or steel structures. However, as a service structural part, due to the characteristics of low melti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N29/14
CPCG01N3/32G01N29/14G01N2203/0005G01N2203/0073G01N2291/0234
Inventor 闫志峰董鹏张红霞王文先王小娇李程浩
Owner TAIYUAN UNIV OF TECH
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