Accession Number : ADA548016


Title :   A Weakest-Link Approach for Fatigue Limit of 30CrNiMo8 Steels (Preprint)


Descriptive Note : Journal article (preprint)


Corporate Author : TEXAS TECH UNIV LUBBOCK DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Ekwaro-Osire, S ; Kulkarni, H V


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a548016.pdf


Report Date : Mar 2011


Pagination or Media Count : 30


Abstract : The transfer of fatigue data from laboratory specimens to field components under multiaxial fatigue is a difficult task. This is particularly the case in the transfer of data from specimens with well-defined shapes to components in the field with arbitrary shapes. A number of effects are to be considered in the transfer of data from a laboratory specimen to a field component. These effects include: pure size effect, pure gradient effect or notch size effect, and load type effect. The research question for this study was: Can an effective weakest-link approach for the fatigue limit of 30CrNiMo8 steels be developed? The specific aims constructed to address the research question were: (1) to develop an algorithm for the weakest-link approach to capture the pure size effect; (2) to perform verification studies on the algorithm for the weakest-link approach; and (3) to investigate volume effect and other effects on predictions of the probabilities of failure. The theory of the weakest-link formulation combined with the Dang Van fatigue failure criteria was used to develop an algorithm for the calculated probability of failure.


Descriptors :   *STEEL , *TEST METHODS , ALGORITHMS , COMPARISON , DATA ACQUISITION , EXPERIMENTAL DATA , FAILURE(MECHANICS) , FATIGUE(MECHANICS) , FIELD TESTS , LABORATORY TESTS


Subject Categories : Metallurgy and Metallography
      Test Facilities, Equipment and Methods
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE