TITLE:
Experimental Study on Mechanical Properties of Q690 High-Strength Steel after High Cycle Fatigue Damage
AUTHORS:
Ran Luo
KEYWORDS:
Q690 High-Strength Steel, Fatigue Damage, Mechanical Property, Stress-Strain Curve, Reduction Factor
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.12 No.2,
February
23,
2022
ABSTRACT: Through the static tensile test of Q690 high-strength steel, the relevant mechanical parameters
are obtained and the maximum fatigue load is determined. The fatigue life is
measured by the fatigue test under the load. According to the fatigue
cumulative damage method, the number of fatigue pre-damage vibration is
designed in proportion. Then the fatigue pre-damage test is carried out on the
high-strength steel, the stress-strain curve and the variation of residual
mechanical property reduction coefficient with fatigue damage were drawn. The results
show that: compared with the undamaged specimens, the yield strength and
tensile strength of Q690 steel are less affected by fatigue damage, but the
elongation changes more significantly, and the elastic modulus is not
significantly affected. Finally, through the change of mechanical properties of Q690 high-strength steel with different fatigue damage, it provides a scientific basis for the performance evaluation of
existing Q690 high-strength steel structure after fatigue damage.