Accession Number:

AD0253377

Title:

A SYSTEM FOR ESTIMATING CUMULATIVE FATIGUE DAMAGE BY USING THE MINER RULE CORRECTED FOR RESIDUAL STRESS

Descriptive Note:

Corporate Author:

GENERAL DYNAMICS SAN DIEGO CA CONVAIR DIV

Personal Author(s):

Report Date:

1961-03-10

Pagination or Media Count:

19.0

Abstract:

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE