Results 261 to 270 of about 58,869 (302)
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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 in a Cracked Cylinder Under Pressure
2008The circumferential stress varies through the wall thickness when a cylinder is subjected to internal or external pressure. Internal pressure will induce tensile circumferential stress while external pressure compressive stress, in terms of the thick-walled cylinder theory [1].
J. Zhao, R. Liu, T. Zhang, X. J. Wu
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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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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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Synergetic Effects of Fatigue Crack Closure Mechanisms
1999Results are presented relating to the relative effect of two closure mechanisms. Two different crack closure mechanisms, closure due to surface roughness induced by shear lips and conventional plasticity-induced closure, are investigated and compared by performing fatigue crack growth tests on aluminum 2024 and technically pure aluminum.
J Zuidema, TM van Soest, M Janssen
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Effect of Crack Closure on Magnitude of Modulated Wave
International Journal of Structural Stability and Dynamics, 2020Fatigue cracks generated by repeated loads cause structural failures. Such cracks grow continuously and at an increasing speed owing to the concentration of stresses near the crack tips. Therefore, the early detection of fatigue cracks is imperative in the field of structural-health monitoring for the safety of structures exposed to dynamic loading ...
Sang Eon Lee, Jung-Wuk Hong
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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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Microstructural effects on crack closure and propagation thresholds of small fatigue cracks
Fatigue & Fracture of Engineering Materials & Structures, 2001The crack closure behaviour of microstructurally small fatigue cracks was numerically simulated by combining the crack‐tip slip band model with the plasticity‐induced crack closure model. A Stage II crack started to propagate from an initiated Stage I crack.
Y. Akiniwa, K. Tanaka, H. Kimura
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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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Crack Closure and Overload Effects in Fatigue
1983Observations of crack closure occurring during crack propagation in thin sheet materials under variable amplitude cyclic loading are discussed. The studies show that closure in the region immediately adjacent to the crack tip is important in controlling crack growth. From this basis, the Dugdale model and a simple fracture mechanics analysis is used to
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