Study of vibration frequency-fatigue strength action of 6061-T6 aluminum alloy during fillet welding

The research mainly focuses on the fatigue strength characteristics of 6061-T6 aluminum alloy fillet welds under different vibration frequencies. Firstly, by introducing Stress Life Curve (S-N Curve) and Probability (P-S-N Curve), external stress effects main load-bearing points in environment welded joints are analyzed. Subsequently, a test control system is designed to analyze relationship between frequency through nominal analysis hot spot analysis. findings revealed that method, P-S-N fitting curve showed declining trend with an increase life for variation curves survival rates 50 %, 95 97.7 % at frequencies 57.5 Hz, 67.5 77.5 Hz. At same rate conditions, formed resonance was smaller, state relatively lower. There certain correlation strength, corresponding low life. This result helps reveal behavior stresses, providing reference structural safety design components.