Page 317 - Biaxial Multiaxial Fatigue and Fracture

The Background of Fatigue Limit Ratio of Torsional Fatigue to Rotating Bending Fatigue in .__ 301

Table 5. Classification of fatigue limit ratios z ,,,/ u

Characteristics of material Z ,,,/ (T I Example material

Fatigue Crack Age-hardened Al-alloy
limit does
not depend initiates
on defects from
0.65-0.7 I Cast carbon steel
Fatigue Shape 0.75 Steel with a hole
limit
depends on of Connected hole 0.9 Nodular cast iron
defects defect Crack-like defect 1 1 Gray cast iron

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