Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 77, Issue -, Pages 199-215Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2015.02.010
Keywords
Cumulative damage; Life prediction; Linear damage rule; Double linear damage rule; Austenitic stainless steel
Funding
- French technical safety organisation IRSN (Institut de Radioprotection et de Surete Nucleaire)
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In order to investigate cumulative damage in fatigue, a multi-level fatigue programme has been carried out on an austenitic stainless steel AISI 304L. All the tests have been performed under controlled strain-amplitude conditions, with several changes of levels up to rupture; values of strain-amplitude were included between 0.20% and 0.80%. The present experimental programme shows that applying a linear damage rule (LDR), also referred to as Palmgren-Miner's rule, has been demonstrated to be unreliable in some cases. A loading sequence (loading history) effect is clearly shown for the two-level sequence tests; application of the LDR leads to residual fatigue-life overestimation for high-to-low loading (H-L) sequences whereas residual fatigue-life is underestimated for low-to-high loading (L-H) sequences. The multi-level and block tests, undertaken in this campaign, confirm also a possible non-verification of the LDR. Within this framework, the double linear damage rule (DLDR) has been tested. Its application would seem to be promising as an additional approach in certain situations. However, complex sequences and random fatigue tests are still needed to draw a conclusion, and to more clearly evaluate the conditions where use of the LDR would not be sufficient. (C) 2015 Elsevier Ltd. All rights reserved.
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