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Method for predicting fatigue limit of magnesium alloy component

A fatigue limit, magnesium alloy technology, applied in the preparation of test samples, measuring devices, using repetitive force/pulse force to test the strength of materials, etc. Harsh and other problems, to achieve the effect of advanced technology and reasonable

Inactive Publication Date: 2017-06-20
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two methods require the use of thermal imaging cameras, the equipment cost and use conditions are relatively harsh, and the test process is not simple enough, which is not conducive to popularization and use.

Method used

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  • Method for predicting fatigue limit of magnesium alloy component
  • Method for predicting fatigue limit of magnesium alloy component
  • Method for predicting fatigue limit of magnesium alloy component

Examples

Experimental program
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Embodiment Construction

[0033] A method for predicting the fatigue limit of magnesium alloy components includes the following steps:

[0034] The chemical materials used are: magnesium alloy plate, ethanol, mechanical pencil, scale and sandpaper. The amount to be prepared is as follows: millimeters and milliliters are the unit of measurement

[0035] Magnesium alloy plate: 3 pieces of AZ31B 300 mm×300 mm×5mm

[0036] Ethanol: C2H5OH 500 mL±10 mL

[0037] Sandpaper: SiC 800 mesh 276 mm×0.5 mm×230 mm 2 sheets

[0038] Sandpaper: SiC 1000 mesh 276 mm×0.5 mm×230 mm 2 sheets

[0039] Sandpaper: SiC 1500 mesh 276 mm×0.5 mm×230 mm 2 sheets

[0040] The first test piece processing and preparation

[0041] ① According to the GB / T 228-2008 standard, 15 AZ31B magnesium alloy fatigue specimens were processed, and the specimen axis was the plate rolling direction;

[0042] ② Grind the fatigue test piece with sandpaper to make the surface of the test piece and the wire cutting surface smooth. The roughness of the front and back...

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Abstract

The invention relates to a method for predicting thefatigue limit of a magnesium alloy component, and belongs to the technical field of magnesium alloy material mechanical properties. The method is characterized by comprising the following steps: by aiming at a deformation process of magnesium alloy under action of a cyclic load, obtaining an average cyclic strain curve along with a regular change of strain since a magnesium alloy sample can generate irreversible deformation under higher cyclic stress; through analyzing a linear relation between an average cyclic strain curve stabilization value and the cyclic load, determining an intersection point of two straight lines, and thus obtaining the fatigue limit of the magnesium alloy. The method does no need experimenters to observe the sample all the time, and has the advantages of convenience, quickness, accuracy and the like.

Description

Technical field [0001] The invention provides a method for predicting the fatigue limit of magnesium alloy components, which belongs to the application field of the measurement of fatigue dangerous points of magnesium alloy materials and the prediction of fatigue limit. Background technique [0002] Magnesium alloy is the lightest metal structural material. It has the characteristics of low density, high specific strength and specific rigidity, good damping and shock absorption, excellent machining performance, stable size of parts, and easy recycling. "The transportation equipment industry has potential application value. At the same time, these structures are inseparable from the support of welding technology, and are subject to fatigue loads, which are prone to fatigue failure. [0003] Fatigue fracture is a main form of failure of metal materials and their welded structures. It occurs in structures that are subjected to alternating or pulsating strain. Generally speaking, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N1/28G01N1/34
CPCG01N2203/0073G01N2203/0005G01N3/08G01N2203/0016G01N2203/0676
Inventor 闫志峰董鹏张红霞王文先李程浩贺秀丽李宇力
Owner TAIYUAN UNIV OF TECH
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