A System for Estimating Cumulative Fatigue Damage by Using the Miner Rule Corrected for Residual Stress

Download or read book A System for Estimating Cumulative Fatigue Damage by Using the Miner Rule Corrected for Residual Stress written by C. R. Smith and published by . This book was released on 1961 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: While the Miner rule for estimating cumulative damage is being used rather extensively in estimating service life, it is well known that such estimates can be off by several hundred percent. The largest contribution to these discrepancies is the residual stress acquired at concentrations at upper level loading. While this effect is usually beneficial, structures employing riveted connections usually suffer losses where highest loads do not exceed 30% of ultimate strength. This paper proposes using the Miner relationship in conjunction with S-N curves obtained after one application of a load equivalent to the highest load statistically probable in the first 10% of service life. Test data comparing the basic and modified methods are presented. An extension of this work would indicate that fatigue-life prediction for spectrum type loading can be based on single-load level tests. (Author).