Fatigue Endurance Limit of Steel
An endurance or fatigue limit which is defined as the maximum stress below which the steel could presumably endure an infinite number of cycles is discussed. A simple rule of thumb calculation for the fatigue limit is one-half of the ultimate tensile strength. This relationship works up to ultimate strengths of 150,000 psi or 150 ksi (1,034 MPa). A fatigue limit of 100 ksi appears to be maximum value that can be obtained for steel. The stress intensity (K) for a penny- shaped flaw embedded in an infinite plate will be used to model a nonmetallic inclusion. Improved steel cleanliness of 52100 steel using vacuum melting and/or vacuum degassing translates into an increase of three times the life at a specified stress or a 50% increase in the stress at specified life.
D. C. Van Aken, "Fatigue Endurance Limit of Steel," Industrial Heating, BNP Media, Inc., Jan 2001.
Materials Science and Engineering
Article - Journal
© 2001 BNP Media, Inc. , All rights reserved.