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Analysis method for fatigue crack propagation based on magnesium alloy electron beam welded sample

A fatigue crack propagation and electron beam welding technology, applied in the direction of analyzing materials, using sonic emission technology for material analysis, instruments, etc., can solve the problems of consuming test materials, long test cycles, etc., to achieve simple test process, simplify the test process, Work-saving effect

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

This fatigue crack growth test method requires a long test period on a single test piece, and in order to obtain reliable test data, multiple sets of tests need to be carried out. Therefore, the current test method not only consumes a large amount of test materials, but also due to The crack length is directly observed with the eyes, there is a certain observation error

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  • Analysis method for fatigue crack propagation based on magnesium alloy electron beam welded sample
  • Analysis method for fatigue crack propagation based on magnesium alloy electron beam welded sample
  • Analysis method for fatigue crack propagation based on magnesium alloy electron beam welded sample

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with specific embodiments.

[0039] The material that the present invention adopts is the AZ31B magnesium alloy of commercial 10mm thick extrusion molding, and test piece size is as follows figure 1As shown, the wire cutting method is used to process along the direction perpendicular to the extrusion; after the processing is completed, the surface of the test piece is polished with 800 mesh, 1000 mesh and 1500 mesh metallographic sandpaper in order to make the surface and the wire cutting surface smooth. Roughness up to R a =0.32-0.63μm; the surface of the test piece starts from the prefabricated crack, and draws 30 parallel lines with an interval of 1mm perpendicular to the crack propagation direction to observe the crack propagation length; the fatigue test equipment is a low-frequency tension-compression fatigue crack growth test machine. The fatigue load is a pull-pull load, the cyclic characte...

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Abstract

The invention discloses an analysis method for fatigue crack propagation based on a magnesium alloy electron beam welded sample, and belongs to the technical field of mechanical properties of magnesium alloy materials. The analysis method is characterized by being a process of expanding a test piece under action of fatigue load for a magnesium alloy containing precracks; inner energy of the test piece is increased as a result of an elasticoplastic deformation effect; and finally, energy is released when the cracks propagate, so as to obtain a relation curve of an acoustic emission signal inside the test piece and circulating times; and an expansion condition of a fatigue test piece is determined by analyzing curve shape characteristics, so that a critical value that the magnesium alloy enters an unstable propagation stage is obtained. The method does not require experiment personnel 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 relates to an analysis method for fatigue crack growth of a magnesium alloy electron beam welding sample, which belongs to the technical field of mechanical properties of magnesium alloy materials. It specifically relates to the critical stress intensity factor amplitude ΔK for crack propagation of a magnesium alloy fatigue test piece TC The technical scheme of the analytical method. Background technique [0002] Fatigue and fracture are the most important causes of failure of engineering structures. In engineering structures, failures caused by fatigue fracture accidents account for more than 80% of the total failures. Once fatigue cracks appear, if the expansion cannot be reasonably predicted, people’s lives will be lost. Catastrophic loss of property. Over the years, people have accumulated rich experience in the observation of fatigue phenomena, the study of fatigue mechanism, the prediction of fatigue life and the development of an...

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Application Information

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IPC IPC(8): G01N29/14
CPCG01N29/14G01N2291/0234
Inventor 闫志峰董鹏张红霞王文先苏应虎李程浩
Owner TAIYUAN UNIV OF TECH
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