Results 271 to 280 of about 186,782 (332)
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International Journal of Refractory Metals and Hard Materials, 2019
Chemical vapour deposited TiCN-Al2O3 hard coatings applied on hard metals may remain in a residual tensile stress state after production and sometimes they show a surface crack network.
Lukáš Faksa +5 more
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Chemical vapour deposited TiCN-Al2O3 hard coatings applied on hard metals may remain in a residual tensile stress state after production and sometimes they show a surface crack network.
Lukáš Faksa +5 more
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Journal of Geophysical Research: Solid Earth, 2022
The elastic properties of rocks depend on the mineral constituents, pore structure, saturating fluids, and stress (loading) conditions. To study these properties, we measured ultrasonic P‐ and S‐wave velocities as a function of the differential ...
Yijun Wei, J. Ba, J. Carcione
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The elastic properties of rocks depend on the mineral constituents, pore structure, saturating fluids, and stress (loading) conditions. To study these properties, we measured ultrasonic P‐ and S‐wave velocities as a function of the differential ...
Yijun Wei, J. Ba, J. Carcione
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Long Fatigue Cracks — Microstructural Effects and Crack Closure
MRS Bulletin, 1989Fracture mechanics technology is an effective tool for characterizing the rates of fatigue crack propagation. Generally, fatigue crack growth rate (da/dN) in each loading cycle can be presented as a function of stress intensity range (ΔK), where ΔK=Kmax—Kmin,KmaxandKminare the maximum and the minimum stress intensities, respectively.
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The effect of infiltration induced crack closure on crack growth retardation
Scripta Metallurgica et Materialia, 1994It is now well known that extra materials on the flanks of a fatigue crack will cause premature crack closure and a reduction in crack growth rate. These extra materials may be residual plastic wake, corrosion/oxidation products, phase transformation and fluid.
Sheu, B. C. +2 more
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Effect of loading sequences on fatigue crack growth and crack closure in API X65 steel
Marine Structures, 2019This paper presents a predictive model for fatigue crack growth under loading sequences. Several parameters had been quantified mainly under variable amplitude loading due to its peculiarities.
N. Mansor, S. Abdullah, A. Ariffin
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Effects of Crack Closure on Ultrasonic Transmission
1983Ultrasonic waves are attenuated as they propagate past the tip of a crack due to the reflection of the energy at the crack face and diffraction at the crack tip. Crack closure modifies the situation since partial transmission can occur at points along the crack face where asperities come in contact.
Thompson, R. Bruce +4 more
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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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Crack closure effects on fatigue damage ahead of crack tips
International Journal of Fatigue, 2019Abstract Elber’s assumed long ago that the effective stress intensity factor (SIF) range ΔKeff = Kmax − Kop is the actual driving force for fatigue crack growth (FCG), where Kop is the SIF that fully opens the crack, and his idea still is widely used to predict residual lives of cracked components.
Samuel Elias Ferreira +3 more
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Oxide induced crack closure in the near threshold regime: The effect of oxide debris release
International Journal of Fatigue, 2018Within this work the influence of oxide particle transport during fatigue loading on the fatigue propagation rate was investigated in detail by means of load-shedding tests in the near threshold region (crack propagation rate between 0.1 and 10 nm per ...
J. Maierhofer +3 more
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THE EFFECT OF ARTIFICIAL FATIGUE‐CRACK CLOSURE ON FATIGUE‐CRACK GROWTH
Fatigue & Fracture of Engineering Materials & Structures, 1993AbstractAn investigation of the effects of artificial fatigue‐crack closure on the subsequent growth of fatigue cracks, at constant range of stress‐intensity factor, was carried out for the following closure materials: (i) electroplated nickel; (ii) electroless nickel; (iii) ethylcyanoacrylate (ECA) adhesive; (iv) low‐melting point (LMP) solder. It was
A. Ur‐Rehman, P. F. Thomason
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