This paper discusses the prediction method and extension strategy of fatigue life of mechanical forgings. Firstly, the importance and present situation of fatigue life prediction are introduced, and then the common fatigue life prediction methods are described in detail. Then, different strategies to prolong the fatigue life of mechanical forgings are discussed, including material selection, design optimization, surface treatment and manufacturing process improvement. Finally, the significance of fatigue life prediction and extension strategy in practical application is summarized.
As a key component of various mechanical equipment and structures, the fatigue life of mechanical forgings is directly related to the safe operation and service life of equipment. It is of great significance to predict the fatigue life of mechanical forgings and adopt corresponding extension strategies for improving equipment reliability, reducing maintenance costs and ensuring personal safety. Therefore, it is of great practical significance to study the fatigue life prediction and extension strategy of mechanical forgings.
Fatigue life prediction is to predict the fatigue failure time and life of forging under cyclic load by analyzing the stress, strain, material properties and other factors. Common fatigue life prediction methods include nominal stress method, local stress strain method and fracture mechanics method. These methods have their own characteristics, and suitable methods can be selected for fatigue life prediction according to the actual situation.
Strategies for extending fatigue life of mechanical forgings
Material selection: The selection of materials with good fatigue properties, such as high-strength steel, titanium alloy, etc., can significantly improve the fatigue life of mechanical forgings.
Design optimization: By optimizing the structural design of forgings, reducing stress concentration and reducing the amplitude of alternating stress, the initiation and expansion of fatigue cracks can be delayed.
Surface treatment: The use of shot blasting, rolling and other surface treatment technology, can improve the residual compressive stress on the surface of the forging, inhibit the initiation and expansion of fatigue cracks.
Manufacturing process improvement: Optimizing forging process parameters, such as temperature, strain rate, etc., can improve the internal structure and mechanical properties of the forging, and improve its fatigue resistance.
The strategy of fatigue life prediction and extension is of great significance in practical application. Firstly, through fatigue life prediction, the fatigue performance of different design schemes can be evaluated at the design stage to avoid potential safety hazards. Secondly, adopting an appropriate extension strategy can improve the service life of mechanical forgings, reduce the frequency of equipment maintenance and replacement, and reduce operating costs. Finally, the research and application of fatigue life prediction and extension strategy is helpful to promote the technological progress of machinery manufacturing industry and improve the overall competitiveness and reliability of China’s machinery and equipment.
This paper discusses the fatigue life prediction method and extension strategy of mechanical forgings, and emphasizes its importance in the design and manufacture of mechanical equipment. The fatigue life of mechanical forgings can be extended effectively and the safety and economy of equipment can be improved by choosing the prediction method reasonably and adopting the corresponding strategies in material selection, design optimization, surface treatment and manufacturing process improvement. In the future, with the continuous progress of science and technology and the emergence of new methods, the fatigue life prediction and extension strategy of mechanical forgings will be more targeted and effective, providing strong support for the sustainable development of the machinery manufacturing industry.
