Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


holycross_dissertation.pdf (134.99 MB)

ETD Abstract Container

Abstract Header

A multiscale analysis and extension of an energy based fatigue life prediction method for high, low, and combined cycle fatigue

Holycross, Casey M.
http://orcid.org/0000-0002-6426-6305
http://rave.ohiolink.edu/etdc/view?acc_num=osu1462572899

Abstract Details

2016, Doctor of Philosophy, Ohio State University, Aeronautical and Astronautical Engineering.
An improved fatigue life prediction method has been developed for Al 6061-T6511 test specimens using strain energy density as the criteria for assessing fatigue strength of plain and notched geometries at various stress ratios and loading spectra for cyclic lives from 10 to 105. The approach features interrogation at continuum and mesoscales using both a traditional fracture mechanics approach and a newly developed experimental procedure to determine strain energy density about machined notch roots in situ using digital image correlation. Testing revealed a critical strain energy density value independent of load ratio, notch geometry, and the effects of localized plasticity, indicating a new material dependent quantity to assess cyclic damage. The method better predicts lifetimes in low cycle fatigue than previously developed approaches, and has inherent capability to describe an endurance limit phenomenon. This study constitutes the most comprehensive investigation of strain energy density within the framework of the energy based fatigue life prediction method developed by Scott-Emuakpor et al., offering significant insight into cyclic damage behavior for all practical length scales and lifetimes.
M.-H. Herman Shen, Ph.D. (Advisor)
Noriko Katsube, Ph.D. (Committee Member)
Jen-Ping Chen, Ph.D. (Committee Member)
Brian Harper, Ph.D. (Committee Member)
Tommy George, Ph.D. (Committee Member)
Onome Scott-Emuakpor, Ph.D. (Committee Member)
243 p.
Aerospace Engineering
fatigue; strain energy density; digital image correlation; fracture mechanics; control volume

Recommended Citations

Citations

  • Holycross, C. M. (2016). A multiscale analysis and extension of an energy based fatigue life prediction method for high, low, and combined cycle fatigue [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1462572899

    APA Style (7th edition)

  • Holycross, Casey. A multiscale analysis and extension of an energy based fatigue life prediction method for high, low, and combined cycle fatigue. 2016. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1462572899.

    MLA Style (8th edition)

  • Holycross, Casey. "A multiscale analysis and extension of an energy based fatigue life prediction method for high, low, and combined cycle fatigue." Doctoral dissertation, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1462572899

    Chicago Manual of Style (17th edition)

osu1462572899
271
© 2016, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.