Fatigue analysis is usually used to predict the cycle load life of magnesium forgings of construction machinery. Here is a common method:
- Determine the fatigue performance parameters of the material: fatigue performance parameters include the stress-strain curve of the material, fatigue limit, stress amplitude and life relationship. These parameters can be obtained experimentally or from relevant material databases.
- Build load spectrum: According to the actual use conditions and working environment, determine the typical working conditions of construction machinery, and convert it into the corresponding load spectrum. The load spectrum describes the stress variation during loading and is the basis of fatigue analysis.
- Stress analysis: Using finite element analysis and other methods to carry out stress analysis of magnesium forgings under different working conditions. By calculating the stress distribution under different loads, the stress concentration of parts can be evaluated.
- Fatigue life estimation: According to the fatigue performance parameters and load spectrum of materials, fatigue life estimation methods (such as Miner’s criterion, Smith-Watson-Topper criterion, etc.) are used to calculate the fatigue life of parts under given working conditions.
It should be noted that this method can only provide a relatively accurate prediction, and the specific service life is still affected by a number of factors, such as manufacturing quality, material strength, and working environment. Therefore, in practical applications, it is necessary to consider other factors and carry out additional safety margin design.
