The correlation law between the causes of fatigue fracture of elastic bars and the line environment
How does stress concentration cause fatigue fracture of spring bars?
Stress concentration is prone to occur at the arc transition and sudden change in cross-section of the elastic bar. When the stress exceeds the fatigue strength of the material under repeated loading, microcracks will initiate and gradually expand, eventually leading to brittle fracture.
What effects do material defects have on the fatigue life of spring bars?
Defects such as inclusions, pores and microcracks in the material can become crack sources and accelerate fatigue failure. The more defects and the larger the size, the shorter the fatigue life of the spring bar and the higher the risk of fracture.
How does a corrosive environment accelerate the failure of spring bars?
Damp, salt spray, chemical waste gas and other environments can form corrosion pits on the surface of the spring bar, becoming new stress concentration points. Corrosion and fatigue work together, significantly shortening the service life of the spring bar and causing early fracture.
What influence does the vibration frequency of the line have on the fatigue fracture of the elastic bar?
The closer the vibration frequency is to the natural frequency of the elastic bar, the stronger the resonance will be, and the number of stress cycles will increase rapidly. Under high-frequency vibration, the fatigue damage of the elastic bar accumulates at an accelerated rate, and the probability of fracture increases significantly.
How to reduce the risk of fatigue fracture of the spring bar?
Optimize the structural design to reduce stress concentration, select high fatigue strength materials, and carry out surface anti-corrosion treatment well. Regularly check the condition of the spring bars, replace fatigued and damaged parts in a timely manner, and reduce the risk of breakage.