Endurance Limits and Fatigue Stress

Endurance limits and fatigue stress for some steels

bolt fatigue failure

Most steels have an endurance limit about half the tensile strength.

Steel BS Treatment Tensile Strength
- σu -
(N/mm2)
Endurance Limit
- σe -
(N/mm2)
σeu
0.4% Carbon BS970 080M40 Normalized 540 270 0.5
0.4% Carbon BS970 080M40 Hardened and tempered 700 340 0.49
Carbon, manganese BS970 150M19 Normalized 540 250 0.46
Carbon, manganese BS970 150M19 Hardened and tempered 700 325 0.53
3% Chrome molybdenum BS970 709M40 Hardened and tempered 1000 480 0.48
Spring steel BS970 735A50 Hardened and tempered 1500 650 0.43
18.8 Stainless Cold rolled 1200 490 0.41
  • Fatigue limit, endurance limit, and fatigue strength are used to describe the amplitude (or range) of cyclic stress that can be applied to the material without causing fatigue failure.

Related Topics

  • Mechanics - Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects
  • Statics - Loads - force and torque

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