A universal functional for the physical description of fatigue crack growth in high-cycle and low-cycle fatigue conditions and in various specimen geometries

•A universal functional correlates fatigue crack growth data of a wider variety of materials.•The inversed version provides excellent descriptions of crack length versus cycles data.•This concept provides a new physical basis to characterize fatigue crack growth. [Display omitted] A simple universal...

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Bibliographic Details
Published inInternational journal of fatigue Vol. 102; pp. 261 - 269
Main Author Ravi Chandran, K.S.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.09.2017
Elsevier BV
Subjects
Aluminum
Bend tests
Bending
Bending fatigue
Crack growth
Crack propagation
Fatigue
Fatigue failure
Fatigue life
Fatigue tests
Fracture mechanics
High-cycle fatigue
Low cycle fatigue
Materials fatigue
Metals
Nickel
PMMA
Polymers
Titanium
PMMA
Aluminum
Low-cycle fatigue
Titanium
Fatigue
Nickel
High-cycle fatigue
Crack growth
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Summary:•A universal functional correlates fatigue crack growth data of a wider variety of materials.•The inversed version provides excellent descriptions of crack length versus cycles data.•This concept provides a new physical basis to characterize fatigue crack growth. [Display omitted] A simple universal functional is shown here to correlate fatigue crack growth data of a wide variety of materials (metals, polymers), test conditions (high-cycle and low-cycle fatigue), and specimen configurations (tension and bending). The proposed functional is a power law that relates the normalized remaining ligament size to the normalized remaining fatigue life in a cyclically loaded specimen. The functional evolved from the idea that at any stage during fatigue, the remaining fraction of cycles required to fracture the specimen, completely, depends on the remaining fraction of section to be broken by the fatigue crack before that final fracture. More importantly, the surrogate form of the functional is shown to provide excellent descriptions of the raw crack-length-versus-cycles data in fatigue crack growth. The functional provides a new physical basis to characterize fatigue crack growth in materials and is promising for extensions in to more complicated fatigue loading conditions.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2017.01.046