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Fatigue analysis method based on magnesium alloy test piece surface temperature characteristics

A surface temperature and fatigue analysis technology, which is applied in the direction of analyzing materials, strength characteristics, and preparation of test samples, can solve the problems that the specific characteristics of the magnesium alloy test piece are not accurately given, the test process is not simple enough, etc., and the test period is short. , save test time, the effect of less test pieces

Active Publication Date: 2014-08-27
TAIYUAN UNIV OF TECH
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Problems solved by technology

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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  • Fatigue analysis method based on magnesium alloy test piece surface temperature characteristics
  • Fatigue analysis method based on magnesium alloy test piece surface temperature characteristics
  • Fatigue analysis method based on magnesium alloy test piece surface temperature characteristics

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Embodiment Construction

[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 Ra0.32-0.63 μm; 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 100 Hz; during the experiment, the i...

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Abstract

The invention provides a fatigue analysis method based on magnesium alloy test piece surface temperature characteristics, and belongs to the technical field of magnesium alloy material mechanics properties. The method is characterized in that in terms of uneven stress distribution in a test piece under the fatigue load action of magnesium alloy, surface temperature of the test piece changes due to the elasticoplastic deformation effect, and a relation curve between the surface temperature of the test piece and local stress is obtained; curve shape features are analyzed, so that the stress condition of the test piece under fatigue is determined and the fatigue limit of the magnesium alloy is solved. According to the method, the test piece does not need to be loaded until fatigue failure occurs or loaded by specific cyclic times, the relation between internal stress of the test piece under fatigue and the fatigue limit of the magnesium alloy can be quickly determined through fatigue loading only for 3 minutes, and the method has the advantages of being convenient, fast, accurate and the like.

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 most important causes of failure of engineering structures. The failures caused by fatigue fracture accidents account for more than 80% of the total failures in engineering structures. Once fatigue failure 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....

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Application Information

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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
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