The research and prediction of fatigue life of aluminum forgings of agricultural machinery is an important engineering problem, which is related to the reliability and safety of agricultural machinery in use. The following I will introduce to you the general methods and steps of fatigue life research and prediction of agricultural machinery aluminum forgings.
- Material properties test: First of all, it is necessary to test the material properties of agricultural machinery aluminum forgings, including the chemical composition, mechanical properties (such as strength, toughness), hardness and so on. These test data will provide basic data for subsequent research.
- Microstructure analysis: Through metallographic microscopy, scanning electron microscopy and other means to analyze the microstructure of agricultural machinery aluminum forgings, including grain size, grain boundary characteristics, inclusions, defects, etc. The microstructure has an important effect on the fatigue properties, and the strength distribution and stress concentration inside the material can be understood through analysis.
- Fatigue test: fatigue test of agricultural machinery aluminum forgings to obtain fatigue life data. The test is usually carried out with sinusoidal load or step load, and the data of load, strain and life are recorded. The fatigue properties under different load levels, different strain ratios and different environmental conditions can be considered in the test.
- Establishment of fatigue life prediction model: According to the test data, the fatigue life prediction model of agricultural machinery aluminum forgings was established. The commonly used models include limit stress method, strain allowance method and residual life method based on stress-strain theory. Factors such as material properties, test conditions and loading forms should be considered in the establishment of the prediction model, and the model should be verified.
- Life prediction and reliability analysis: Using the established fatigue life prediction model, combined with the actual working load, working environment and other parameters, the life prediction and reliability analysis of agricultural machinery aluminum forgings are carried out. Through the analysis, the fatigue life of aluminum forgings of agricultural machinery can be understood, its service life can be predicted and corresponding improvement measures can be put forward.
It should be noted that the research and prediction of fatigue life is a complex process, which needs to fully consider the comprehensive effect of multiple factors such as material characteristics, test conditions and actual use environment. At the same time, the research process also needs to rely on professional test equipment and analytical means to support and verify the relevant research results.
