A Fatigue Analysis Method Based on Surface Temperature Characteristics of Magnesium Alloy Specimen
A surface temperature and fatigue analysis technology, applied in the analysis of materials, strength properties, preparation of test samples, etc., can solve the problems of not accurately giving the specific characteristics of magnesium alloy specimens, and the test process is not simple enough, and achieve a short test period. , The effect of saving test time and the number of test pieces is small
Inactive Publication Date: 2016-06-08
TAIYUAN UNIV OF TECH
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However, this method only emphasizes the differences in the surface temperature rise of the specimens under different stress levels, and does not accurately give the specific characteristics of the magnesium alloy specimens at a specific stress level. Multiple groups of tests need to be compared to obtain fatigue limit, the test process is not simple enough
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[0039] The present invention will be described in detail below in conjunction with specific embodiments.
[0040] 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 1 As 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. The roughness reaches Ra0.32-0.63μm; the surface of the test piece is coated with a layer of black matte paint to increase the heat reflectivity.
[0041] The fatigue test equipment is a high-frequency tension and compression fatigue testing machine. The fatigue load is a pull-pull load, the cycle characteristic coefficient is 0.1, and the vibration frequency is 100Hz; during the experiment, the infr...
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Abstract
A fatigue analysis method based on the surface temperature characteristics of a magnesium alloy test piece belongs to the technical field of the mechanical properties of magnesium alloy materials. The deformation effect changes the surface temperature of the test piece, and the relationship curve between the temperature and the local stress on the surface of the test piece is obtained; by analyzing the shape characteristics of the curve, the stress of the fatigue test piece is determined, and then the fatigue limit of the magnesium alloy is obtained. The relationship between the internal stress of the fatigue specimen and the fatigue limit of the magnesium alloy can be quickly determined after only 3 minutes of fatigue loading until the specimen is loaded to fatigue failure or a specific cycle, which has the advantages of convenience, speed and accuracy.
Description
technical field [0001] The invention discloses a fatigue analysis method based on the surface temperature characteristics of a magnesium alloy test piece, belonging to the technical field of mechanical properties of magnesium alloy materials. In particular, the invention relates to a technical scheme of a rapid fatigue analysis method for the surface temperature characteristics of a magnesium alloy fatigue test piece. Background technique [0002] Fatigue and fracture are the main 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 damage accidents occur, they often bring catastrophic losses to people's lives and properties. 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 anti-fatigue design technology. The current ...
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IPC IPC(8): G01N3/00G01N1/32G01N1/34G01J5/10
Inventor 张红霞郭少飞王文先闫志峰郝俊丽周亚国陈鹏达张虔铭
Owner TAIYUAN UNIV OF TECH