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The physics of fatigue crack initiation
International Journal of Fatigue, 2013Abstract The fatigue life of a component can be expressed as the sum of two segments of life: (a) the number of loading cycles required to initiate a crack and (b) the number of cycles it takes that crack to propagate to failure. In this review, the primary emphasis is relating the fatigue crack initiation to the microstructure of the material.
Michael D Sangid
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Crack Gages for Detecting Fatigue Crack Initiation
Journal of Structural Engineering, 1987The use of fatigue crack gages is examined, in order to provide a clear indication of fatigue crack inititation and early subscritical crack growth in structural steel details. The crack gage consists of a thin steel coupon that can be bonded to a structural member in the vicinity of a known stress raiser, such as at the end of a cover plate or near a ...
Charles K. Nmai, Mark D. Bowman
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On Crack Initiation Mechanisms in Fretting Fatigue
Journal of Applied Mechanics, 2000By using the crack analogue model of rigid flat-ended contact, crack initiation in fretting fatigue is analyzed. The coefficient of friction at the edge of contact, which characterizes the asymptotic stress field, is considered as the primary controlling parameter in the process.
Yang, B., Mall, S.
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A Dislocation Model for Fatigue Crack Initiation
Journal of Applied Mechanics, 1981The slip band formed in a grain on the material surface is a preferential site for crack initiation during low strain fatigue of polycrystalline metals. The forward and reverse plastic flow within the slip band is modeled in the present study by dislocations with different signs moving on two closely located layers, and it is assumed that their ...
Tanaka, K., Mura, T.
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Fatigue analysis for crack initiation
Quality and Reliability Engineering International, 1986AbstractFor the prediction of life leading to fatigue crack initiation, a method for performing a cycle‐by‐cycle local stress analysis at the stress concentration area of a structural component was developed. Elastoplastic stress‐strain values along the hysteresis loop are traced for each load reversal in making the life prediction calculations.
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Initial Strain Field and Fatigue Crack Initiation Mechanics
Journal of Applied Mechanics, 1983On single aluminum crystals under cyclic loadings, fresh slip lines appeared during the reversed loading, lying very close to, but not coincident with the slip lines formed in the forward loading. These slip lines indicate the start of extrusion or intrusion as commonly observed in fatigue specimens.
S. R. Lin, T. H. Lin
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Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1957
A discussion is given of the formation of persistent slip bands during cyclic stressing and their development into fatigue cracks. In copper and in aluminium at low temperatures fatigue cracks appear to be formed in this way; at room temperature in aluminium they may form also along grain boundaries.
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A discussion is given of the formation of persistent slip bands during cyclic stressing and their development into fatigue cracks. In copper and in aluminium at low temperatures fatigue cracks appear to be formed in this way; at room temperature in aluminium they may form also along grain boundaries.
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Fatigue Crack Initiation with Creep
1982Experimental observations of the micromechanics theory of fatigue crack initiation of Lin and Ito are reviewed. This theory is shown to be applicable also for time-dependent fatigue. An aluminum polycrystal subject to cyclic tension and compression is considered.
T. H. Lin, S. R. Lin
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