A Method for Determining Conservative Fatigue Threshold While Avoiding Crack Closure

The low-rate fatigue properties of a mild steel are obtained on small compact-type (CT) specimens while avoiding crack closure. These properties are similar to those of butt-welded joints obtained at a much lower stress ratio in the range −1 to 0.5. This is a result of the existence of tensile resid...

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Bibliographic Details
Published in:Journal of testing and evaluation 1986-11, Vol.14 (6), p.312-317
Main Authors: Matsuoka, S, Takeuchi, E, Kosuge, M, Shimodaira, M, Ohta, A, Nishijima, S
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
crack propagation
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue
fatigue testing
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
steel
stress
tensile strength
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Summary:The low-rate fatigue properties of a mild steel are obtained on small compact-type (CT) specimens while avoiding crack closure. These properties are similar to those of butt-welded joints obtained at a much lower stress ratio in the range −1 to 0.5. This is a result of the existence of tensile residual stress at the crack tip of the welded joint which prevents crack closure even at low stress ratios. It is concluded that the most conservative fatigue crack propagation properties, including fatigue threshold values, can be easily obtained by confirming that the results are the same for CT specimens tested at different terminal stress ratios using a ΔK decreasing method which avoids crack closure.
ISSN:0090-3973
1945-7553
DOI:10.1520/JTE10348J