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Development of a novel energy-based method for multi-axial fatigue strength assessment

Scott-Emuakpor, Onome Ejaro
http://rave.ohiolink.edu/etdc/view?acc_num=osu1196280356

Abstract Details

2007, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
An accelerated method for determining the fatigue stress versus cycle life (S-N) behavior of isotropic materials is developed for prediction of axial (tension-compression), bending, shear, and multi-axial fatigue life at various stress ratios. The framework for this accelerated method was developed in accordance with a previous understanding of a strain energy and fatigue life correlation, which states: the total strain energy dissipated during a monotonic fracture and a cyclic process is the same material property, where each can be determined by measuring the area underneath the monotonic true stress-strain curve and the area within a hysteresis loop, respectively. The developed framework consists of the following six elements: (1) New experimental procedures used to acquire more sufficient uniaxial and multi-axial test results than conventional methods, (2) an analytical representation for the effect of the stress gradient through the fatigue zone, thus providing capability for bending fatigue prediction, (3) the effect of mean stress on fatigue life for tension/compression and bending, (4) development of an improved energy-based prediction criterion for shear loading at various stress ratios, (5) fatigue life prediction for materials experiencing the endurance limit phenomenon, and (6) the development of a multi-axial fatigue life prediction method. Validation of this accelerated fatigue life determination framework is achieved based on comparison with numerous experimental results acquired from Aluminum 6061-T6 and Titanium 6Al-4V. The results of the comparison are extremely encouraging, thus providing justification that the future direction for the strain-energy based fatigue life prediction method is very promising.
Mo-How Shen (Advisor)
181 p.
Engineering, Mechanical
fatigue; multiaxial; prediction; energy; failure; bending; uniaxial

Recommended Citations

Citations

  • Scott-Emuakpor, O. E. (2007). Development of a novel energy-based method for multi-axial fatigue strength assessment [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196280356

    APA Style (7th edition)

  • Scott-Emuakpor, Onome. Development of a novel energy-based method for multi-axial fatigue strength assessment. 2007. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1196280356.

    MLA Style (8th edition)

  • Scott-Emuakpor, Onome. "Development of a novel energy-based method for multi-axial fatigue strength assessment." Doctoral dissertation, Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196280356

    Chicago Manual of Style (17th edition)

osu1196280356
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© 2007, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.