Results 161 to 170 of about 5,122 (217)

Initial Strain Field and Fatigue Crack Initiation Mechanics

Journal of Applied Mechanics, 1983
On 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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The initial fatigue crack

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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Fatigue Crack Initiation with Creep

1982
Experimental 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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Modelling fatigue crack initiation life

International Journal of Fatigue, 1993
Abstract An accurate formula for the fatigue crack initiation (FCl) life, correlating it with the geometry of notched speciments, the cyclic loading conditions, the behaviour of metals and the tension overloading effect, has been developed based on the hypothesis of the widely used local strain approach, and checked by test results on the FCl life of
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Fatigue Crack Initiation in Iron

1983
Fatigue crack initiation in iron of 99.93+ w/o purity has been carefully characterized at constant plastic strain amplitudes varying from 10−4 to 10−2. Fatigue microcracks initiate transgranularly at all amplitudes; the initial microcracks which form are less than 1 µm in length, as determined by transmission electron microscopy of replicas.
C. V. Cooper, M. E. Fine
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Computer simulation of fatigue crack initiation

Engineering Fracture Mechanics, 1980
Abstract Results of a Monte Carlo simulation of the initiation stage of fatigue failure of aluminum alloys are described. Initiation processes simulated are: (1) nucleation of cracks at particles at or near the alloy surface; (2) early growth of microcracks with lengths on the order of the grain size; and (3) microcrack coalescence.
W.L. Morris, M.R. James, O. Buck
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A further study on fatigue crack initiation life — mechanical model for fatigue crack initiation

International Journal of Fatigue, 1986
Abstract In the present study, a new formula for the fatigue crack initation life is developed based on recent progress in the study of fatigue damage and crack initiation, and is substantiated experimentally. The new formula reveals a correlation between the fatigue crack initiation life, the notched element geometry, the cyclic loading condition ...
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Fatigue Crack Initiation in Solder Joints

Journal of Electronic Packaging, 1996
A backface strain technique is introduced to examine fatigue crack initiation in solder lap joints. The technique detects the fatigue crack initiation by monitoring the backface strain at the end of the overlap. Variation of the backface strain with the development of a crack was simulated by finite element method.
Z. Zhang, Daping Yao, J. K. Shang
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Corrosion–fatigue crack initiation in metals

Nature, 1977
A DEFINITE relationship has been observed between the cyclic plastic strain-enhanced dissolution behaviour of metals in aqueous electrolytes and their corrosion–fatigue behaviour in similar conditions of environment and potential. The existence of such a relationship was first suggested in 19701, and the present work forms part of a wide study to ...
C. PATEL, T. PYLE, V. ROLLINS
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Fatigue Crack Initiation Under Cyclic Torsion

Journal of Applied Mechanics, 1986
Lin’s ratchet mechanism developed by Lin and his associates for fatigue crack initiation under tension and compression loading is here applied to fatigue under torsional loadings. Under the former loading, the most favorable slip system has a slip plane and a slip direction, both making 45 deg with the free surface; while under the latter the most ...
W. U. Cooley, T. H. Lin
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