Results 251 to 260 of about 68,665 (303)
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Engineering Fracture Mechanics, 1991
Abstract A loading stage for the scanning electron microscope has been used in conjunction with the stereoimaging technique to study fatigue crack closure for a center notched specimen of an aluminum alloy. The results are compared to similar measurements from single edge notched specimens of the same alloy and other materials.
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Abstract A loading stage for the scanning electron microscope has been used in conjunction with the stereoimaging technique to study fatigue crack closure for a center notched specimen of an aluminum alloy. The results are compared to similar measurements from single edge notched specimens of the same alloy and other materials.
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Measurability of Crack Closure
1999Crack closure can be measured either with compliance techniques or by means of crack propagation methods. Each of these methods has its own specific limitation. We have performed simulations to show that the results of the measurements with compliance technique near the tip depend strongly on the position of the displacement gages and ...
R Pippan, FO Riemelmoser, C Bichler
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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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Fatigue crack closure for inclined and kinked cracks
International Journal of Fracture, 2002This 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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Some experimental observations on crack closure and crack‐tip plasticity
Fatigue & Fracture of Engineering Materials & Structures, 2009ABSTRACTThis 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 +4 more
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Modelling Crack Closure for an Interface Crack Under Harmonic Loading
International Journal of Fracture, 2010zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Menshykova, Maryna V. +2 more
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Characterization of Crack Closure
1985Crack 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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Crack growth and closure behaviour of surface cracks
International Journal of Fatigue, 2004Abstract 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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Crack Closure and Variable-Amplitude Fatigue Crack Growth
1988The prediction of service lifetime and the selection of alloys for maximum fatigue crack growth resistance are made complicated by the effect of prior loading histories on the rate of crack growth. Some research indicates that crack closure can be an important factor in accounting for this history effect. This paper presents a review of the lifetime on
AJ McEvily, K Minakawa
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Closure behaviour of small cracks
Steel Research, 1990Measurements of the initiation, growth, and closure behaviour of micro-cracks are reported for one ferritic and one austenitic low strength steel. Interferometric measurements of the COD of small surface cracks were performed with a resolution of 3 nm in order to measure the closure behaviour of micro-cracks. The van der Waals forces between atoms were
Günter Ebi, Peter Neumann
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