Influence of Tension-torsion Stress Amplitude Ratio on Short Fatigue Crack Behaviour of LZ50 Steel

Reliability analysis for systems based on degradation rates and hard failure thresholds changing with degradation levels

“…2) The crack growth of mechanical systems: the fatigue crack is one of the dominant failure modes of mechanical systems. As the size of the crack becomes larger, not only the growth of the crack gets faster but also the hard failure due to vibrations and random loads is triggered more often [41].…”

Research on evolution behavior of 42CrMo microscopic fatigue short crack based on microstructure effect of material

“…The micro fatigue study shows that the fatigue failure process of components includes three stages: crack initiation, propagation, and final instantaneous fracture. 1–5 As symbols of fatigue life, crack initiation, crack propagation, and late fracture are controlled by the synergy of inevitability and contingency, among which the crack initiation stage is the main stage strongly affected by contingency factors. 6–10 Therefore, in order to explore the essential reason of the dispersion of fatigue properties, it is necessary to study the microdamage mechanism of fatigue short crack initiation and propagation at the stage of crack initiation.…”