Results 261 to 270 of about 9,188 (302)

Partial crack closure under block loading [PDF]

International Journal of Fatigue, 2008
Fatigue crack propagation tests under high-low and low-high block loading sequences have been performed in aluminium alloy specimens. The tests were carried out at constant [Delta]K conditions. Two stress ratios were analysed: R = 0.05 and R = 0.4. Crack
L P Borrego, J M Ferreira, J D Costa
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Effect of crack closure on crack initiation parameters

Engineering Fracture Mechanics, 1986
Young’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
openaire   +1 more source

Fatigue crack closure for inclined and kinked cracks

International Journal of Fracture, 2002
This paper presents recent work on finite element modelling of plasticity-induced fatigue crack closure occurring in cracks which are inclined to the loading axis, and which may then develop a kink. Such crack deviations occur naturally during crack growth, and improved life prediction models require understanding of the effects of such inclined ...
L.-W. Wei, M.N. James
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Analysis of crack-dislocation interaction: crack closure, crack opening

Materials Science and Engineering: A, 1994
Abstract The decrease in stress intensity factor, expected from dislocation emission at a crack tip, can be achieved either through a change in crack tip radius (blunting) or through a crack closure induced by the dislocation (shielding) opposite to the opening imposed by the external stress field.
M.A. Loyola de Oliveira, G. Michot
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Crack growth and closure behaviour of surface cracks

International Journal of Fatigue, 2004
Abstract This paper investigated the crack growth and closure behaviour of surface cracks in AISI 4130 alloy steel under the constant amplitude loading and single-overload conditions. The compliance measurements of depth- and surface-wise crack closure were performed using the backface strain gauge and the near-tip gauge, respectively.
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Some experimental observations on crack closure and crack‐tip plasticity

Fatigue & Fracture of Engineering Materials & Structures, 2009
ABSTRACTThis study presents a methodology for evaluating crack closure and the effect of crack‐tip plasticity on stress intensity. Full‐field displacement maps obtained by digital image correlation are used to obtain the mixed‐mode, crack‐driving force.
Lopez-Crespo, P, Shterenlikht, A, Yates, JR, Patterson, EA, Withers, PJ   +4 more
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Modelling Crack Closure for an Interface Crack Under Harmonic Loading

International Journal of Fracture, 2010
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Menshykova, Maryna V., Menshykov, Oleksandr V., Guz, Igor A.   +2 more
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Characterization of Crack Closure

1985
Crack opening and closure levels are determined for small cracks growing from sharp and blunt notches during cyclic loading. Crack tip opening displacement measurements as low as 0.1 μm are reported. Experimental crack opening levels are compared with analytical crack opening levels for various stress intensity ranges, crack lengths, and R-ratios.
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A Review of Crack Closure

1984
Abstract : A comprehensive review and critique of the literature on fatigue crack closure is presented. The elements of closure; its mechanisms, experimental procedures for its determination; the phenomenological study of its dependence on different variables, and methodologies for its prediction, are all discussed in detail.
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On the geometry of fatigue crack closure

Steel Research, 1992
Long fatigue cracks frequently grow at a much lower rate than short cracks because they are closed during part of the stress cycle. The critical crack length for the transition from “short” to “long” depends on the amplitude of stress intensity ΔK and on the stress ratio R. This dependence is explained using a numerical study of the crack flank contour.
Hein‐Peter Stüwe, Reinhard Pippan, Guo Xin Shan   +2 more
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