The analysis of fatigue and fracture behavior of magnesium forgings of construction machinery is to analyze and study the process of fatigue damage and final fracture of parts under alternating or periodic loading conditions, so as to understand the life and safety performance of parts. The following are the general steps and key contents of fatigue and fracture behavior analysis of magnesium forgings of construction machinery:
- Material property analysis: First of all, it is necessary to understand the basic mechanical properties and fatigue parameters of magnesium alloy materials, including tensile strength, yield strength, elongation, etc. Experimental methods such as tensile test, impact test and hardness test can be used to obtain relevant data.
- Fatigue test: Through fatigue test, the fatigue life and S-N curve (stress amplitude – cycle life curve) of magnesium forgings of construction machinery can be obtained. This can be done by standard test methods such as tensile compression fatigue test, bending fatigue test or rotary fatigue test.
- Fracture behavior analysis: For fractured parts, fracture surface analysis and research are needed to determine the fracture type (such as fatigue fracture, corrosion fracture, etc.). Metallographic microscope, scanning electron microscope (SEM) and energy spectrometer were used to observe the morphology and chemical composition of the fracture surface.
- Stress analysis: study the load and stress state of the parts under actual working conditions, simulate and calculate the stress distribution of the parts through finite element analysis and other methods. This helps to understand key stress concentration areas of the part as well as potential fatigue sensitive areas.
- Failure mechanism analysis: Understanding the failure mechanism of magnesium forgings of construction machinery is very important for the analysis of fatigue and fracture behavior. The analysis includes consideration of material properties, stress states, surface conditions, heat treatment and other factors, combined with experimental and numerical simulation methods, to study the damage accumulation, crack growth and final fracture mode of the part.
- Life prediction and evaluation: Based on fatigue test and stress analysis results, life prediction and evaluation can be carried out to determine the service life and safety factor of parts. The commonly used methods include limit stress theory, linear life evaluation method and fatigue strength reduction factor method.
In summary, the fatigue and fracture behavior analysis of magnesium forgings of construction machinery involves material property analysis, fatigue test, fracture behavior analysis, stress analysis, failure mechanism analysis and life prediction and evaluation. Through in-depth research and analysis, it can help optimize the design of parts, extend the service life and improve the reliability of construction machinery products.
