Journal ArticleDOI
The effects of stress ratio and grain size on near-threshold fatigue crack propagation in low-carbon steel
TLDR
In this article, the effects of the stress ratio and the grain size on the fatigue crack growth near the threshold in a low carbon steel were analyzed based on the crackclosure measurement and the microscopic observations of cracktip slip deformation and the fracture surface.About:
This article is published in Engineering Fracture Mechanics.The article was published on 1981-01-01. It has received 84 citations till now. The article focuses on the topics: Grain boundary strengthening & Stress concentration.read more
Citations
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Journal ArticleDOI
Propagation and non-propagation of short fatigue cracks at a sharp notch
K. Tanaka,Yoshikazu Nakai +1 more
TL;DR: In this article, the growth behavior of a short fatigue crack near the notch tip was analyzed based on crack closure measurements, and a quantitative method was proposed for predicting the non-propagating crack length and the fatigue limit of notched specimens as a function of the applied stress and the notch geometry.
Journal ArticleDOI
Effect of stress ratio on near-threshold propagation of delimination fatigue cracks in unidirectional CFRP
TL;DR: In this paper, the effect of the stress ratio on near-threshold growth of delamination fatigue cracks was investigated with unidirectional laminates made from Ciba Geigy 914C prepegs (T300/914) and from Toray P305 pre-pegs.
Journal ArticleDOI
Near-threshold fatigue: a review
Larry Lawson,E.Y. Chen,M. Meshii +2 more
TL;DR: In this paper, the status of the "threshold of fatigue" and its relation to the "fatigue limit" are reviewed. But, the focus of this paper is not on crack propagation, but on the physical significance of crack closure.
Journal ArticleDOI
Near-threshold fatigue crack growth behavior in metals
TL;DR: In this article, the authors compared the near-threshold fatigue crack growth rate (FCGR) behavior in six alloy systems (iron, aluminum, copper, magnesium, nickel and titanium) and found that the value of ΔK th, eff was directly proportional to Young's modulus.
Journal ArticleDOI
Fatigue crack growth mechanisms in steels
K. Sadananda,A.K. Vasudevan +1 more
TL;DR: In this paper, the authors examined the crack growth behavior of structural steels by using the Unified Approach developed by the authors in this approach, fatigue requires two load parameters involving maximum stress intensity, Kmax, and stress intensity amplitude, △K For a fatigue crack to grow, both Kmax and △ K must exceed their respective threshold values Similarly, for any other crack growth rate, two limiting values, KMAX∗ and K�K∗ are required to enforce the growth rate The variation of these two critical values forms the crack trajectory map, which is defined by plotting
References
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Journal ArticleDOI
Fatigue growth threshold of small cracks
TL;DR: In this paper, the effects of grain size and crack length on the threshold condition of fatigue growth of small cracks are analyzed both theoretically and experimentally, based on the assumption that the threshold conditions is determined by whether the crack-tip slip band blocked by the grain boundary propagates into an adjacent grain or not.
Journal ArticleDOI
Effect of stress cycle asymmetry on fatigue crack growth
M. Klesnil,Petr Lukáš +1 more
TL;DR: In this article, the effect of stress cycle asymmetry on fatigue crack rate and on the conditions for a crack not to propagate was studied on sheet steel specimens with a sharp central notch.
Journal ArticleDOI
The slow fatigue crack growth and threshold behaviour of a medium carbon alloy steel in air and vacuum
TL;DR: A quenched and tempered En 24 steel has been tested in air and vacuum (10−5 Torr) at ΔK levels below −30MN/m 3 2 and at positive ratios in the range (0.12-0.7) as mentioned in this paper.
Book ChapterDOI
Threshold for Fatigue Crack Propagation and the Effects of Load Ratio and Frequency
R. A. Schmidt,Paul C. Paris +1 more
TL;DR: In this article, the threshold in the alternating range of stress intensity factor for fatigue crack growth is investigated for 2024-T3 aluminum, and it is seen to decrease with increasing frequency at a fixed load ratio, dropping by nearly a factor of 2 from 342 to 832 Hz.