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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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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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Crack closure and the environmental effect on fatigue crack growth
1976Aerospace ...
Schijve, J. (author) +1 more
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Effect of Crack Closure on Quantitative ECT Inspection of Closed Fatigue Cracks
2008In this paper, the feasibility to apply a closed fatigue crack as a substitute of a Stress Corrosion Crack (SCC) is investigated aiming at applications to ECT crack sizing. Several testpieces of closed fatigue cracks are fabricated, and ECT signals are measured after selected bending loads being applied to close the crack.
Chen Zhenmao +3 more
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Geometry effect on crack closure
International Journal of Fracture, 1994H. Y. Jung +2 more
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The effect of pre-strain on fatigue crack growth and crack closure
Engineering Fracture Mechanics, 1976Abstract A single pre-strain ( ϵ = 0.03 ) applied to 2024-T3 material raised the static yield strength from 428 to 480 MN/m 2 . The growth rate of a fatigue crack in the pre-strained material was about twice as large as in the material that was not pre-strained.
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