Results 231 to 240 of about 9,782,361 (275)
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A cumulative model of fatigue crack growth and the crack closure effect
International Journal of Fatigue, 1984Abstract A model of fatigue crack growth based on an analysis of elastic/plastic stress and strain at the crack tip is presented. It is shown that the fatigue crack growth rate can be calculated using the local stress/strain at the crack tip by assuming that a small highly strained area x ∗ , existing at the crack tip, is responsible for ...
G. Glinka +3 more
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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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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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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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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 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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The effect of overloads on threshold and crack closure
International Journal of Fatigue, 1985Abstract The effect of tensile and compressive overloads on the threshold stress intensity level and crack closure behaviour of one aluminium alloy and three steels has been investigated. A few tensile overloads significantly decreased the crack propagation rate and increased the threshold stress intensity.
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THE EFFECT OF ENVIRONMENT ON CRACK CLOSURE AND FATIGUE THRESHOLD*
Fatigue & Fracture of Engineering Materials & Structures, 1983Abstract— The threshold value for fatigue crack growth of a medium carbon steel was increased when the test‐environment was changed from air to an aggressive H2S‐containing brine. This increase in fatique threshold was shown to be caused by corrosion product‐induced crack closure.
J. A. Ruppen, R. Salzbrenner
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Analysis of effects of crack closure in shells
Engineering Fracture Mechanics, 1989Abstract The effect of crack closure in a shell was studied using the finite element method. Elastic open cylindrical shells, containing through-wall-thickness stationary cracks under bending loads, were considered. Crack closure was modeled using the line closure model.
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Effect of periodic bands of overloads on crack closure
International Journal of Pressure Vessels and Piping, 1989Abstract Crack closure experiments were performed on 6061-T6 Al-alloy for various bands of overloads. These bands of overloads were applied after an interval of 10% CAL life from the beginning and after exhausting 50% CAL life. The sequence is almost constant amplitude loading with periodically inserted multiple overloads, which subsequently cause ...
Raghuvir Kumar, S.B.L. Garg
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