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Endurance Limits and Fatigue Stress

Endurance limits and fatigue stress for some steels

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bolt fatigue failure

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

Steel	BS	Threatment	Tensile Styrength - σ_u - (N/mm²)	Endurance Limit - σ_e - (N/mm²)	σ_e/σ_u
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	Normilized	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.

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