Results 261 to 270 of about 42,379 (316)
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Micromechanisms of Crack Initiation and Crack Propagation
1985After summarizing fracture mechanics parameters the paper introduces micromechanical models of cleavage fracture. It is shown that cleavage can be interpreted in terms of the local tensile stress required to propagate micro-cracks. Methods to determine the microscopic cleavage stress are presented.
W. Dahl, D. Dormagen
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Effect of crack closure on crack initiation parameters
Engineering Fracture Mechanics, 1986Young’s modulus shear modulus elastic constant : 3 -4y plane strain ; 3 -r/l + y plane stress force per unit thickness of plate open end mode I stress intensity factor open end mode II stress intensity factor Poisson’s ratio applied uniform tension, 2p/k + 1 distance of concentrated force from centre line of crack maximum normal stress minimum strain ...
R.S. Alwar, S. Thiagarajan
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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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1994
Fretting fatigue is particularly damaging because it can affect both the initiation and propagation phases of crack life. In the preceding chapter its effect on propagation was discussed and it was shown that in this phase of the crack’s life the problem can be reduced to that of analysing cracks growing in a particularly severe and complex stress ...
D. A. Hills, D. Nowell
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Fretting fatigue is particularly damaging because it can affect both the initiation and propagation phases of crack life. In the preceding chapter its effect on propagation was discussed and it was shown that in this phase of the crack’s life the problem can be reduced to that of analysing cracks growing in a particularly severe and complex stress ...
D. A. Hills, D. Nowell
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Studies on Crack Initiation and Stable Crack Growth
1979Experimental results are presented which suggest that parameters based on the J-integral and the crack opening tip displacement δ are viable characterizations of crack initiation and stable crack growth. Observations based on some theoretical studies and finite-element investigations of the extending crack revealed that J and δ when appropriately ...
CF Shih, HG deLorenzi, WR Andrews
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Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1957
Abstract 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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Abstract 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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Comparing dynamic crack initiation and crack arrest
International Journal of Pressure Vessels and Piping, 1989Abstract The temperature dependences of dynamic crack initiation and crack-arrest toughnesses are compared and found to differ significantly. It is suggested that the reason for this difference arises from the differences in crack morphology associated with the two phenomena.
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Crack arrest and crack initiation in a titanium alloy
Engineering Fracture Mechanics, 1972Abstract It has been demonstrated in the literature that the controlling crack growth criterion in stress corrosion cracking is that derived from fracture mechanics concepts and not a criterion based on gross or net stress. This demonstration was accomplished by testing two types of cracked specimens and showing that crack arrest and crack initiation
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