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Glossary

Endurance Limit (S_FL)

Steel specimens tested in the laboratory exhibit a safe stress below which failure will not occur. This safe stress is called the endurance limit or the fatigue limit. This behavior is only found in steel. In aluminum alloys, a fatigue strength at 10⁷ cycles is usually used in place of the fatigue limit. This is a stress which will produce failures in 10⁷ cycles.